Composition of bimodal polyethylene for obtaining products by pressure moulding

FIELD: chemistry.

SUBSTANCE: invention relates to a bimodal polyethylene high-density composition for obtaining products by pressure moulding, in particular caps and plugging means. The composition includes bimodal high-density polyethylene, a composition of an inorganic alpha-nucleating agent, a composition of a friction-reducing agent, representing amide of primary fatty acid, and a composition with one or more additives, selected from antioxidants, acid acceptors, pigments and UV-stabilisers. The application of bimodal polyethylene in a combination with the inorganic alpha-nucleating agent, in particular, with talc and behenamide, as the friction-reducing agent, makes it possible to obtain the moulding composition with an unexpected and synergic impact on crystallisation temperature, and the composition friction coefficient.

EFFECT: composition by the invention demonstrates higher crystallisation temperature and lower friction coefficient.

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The invention relates to a polyethylene composition for the production of a molding, in particular for caps and closures.

It is known the use of bimodal polyethylene in the manufacture of articles by injection molding, such as caps and closures for bottles. In these applications it is necessary to use high-density polyethylene (HDPE) to provide sufficient rigidity to the lid.

In EP 1146077 AND describes the composition of bimodal HDPE for obtaining products by injection molding with a high young's modulus and high ESCR, which includes a homopolymer of ethylene or copolymer of ethylene with alpha-olefins, including:

i) a homopolymer or copolymer of ethylene with a low molecular weight and

ii) a homopolymer or ethylene copolymer with high molecular weight and nuclearmoose agent.

According to EP 1146077 AND most effective nuclearfamily agents are those containing organic group and a polar group and which is insoluble in HDPE, such as mono - or polycarboxylic aromatic acids or their salts, with essentially effective nuclearfusion agent is sodium benzoate.

In EP 1278797 AND describes the polyolefin composition suitable for receiving caps for bottles by injection molding, comprising a polyethylene with a density of more than 940 kg/m3and p is at least one amide of saturated fatty acid, containing from 8 to 30 carbon atoms. Preferably amide of saturated fatty acid is behenate.

From prior art it is known that the addition of such amides of fatty acids reduces the coefficient of friction, therefore the friction between the first product derived from a polyolefin and another product which is in contact with the first, in particular, in order to avoid friction between the plastic cap and bottle to facilitate unscrewing of the cap.

As stated above, it is known the use of multimodal polyethylene for the manufacture of products by injection molding.

Injection molding can be used to produce a wide range of products, including products having relatively complex shapes and different sizes. Injection molding is suitable, for example, to obtain items such as caps and closures for use for food and drinks, such as, for example, bottles containing carbonated and non-carbonated drinks, or for non-food applications, such as containers for cosmetics and pharmaceuticals.

The cycle of injection molding can be divided into three stages: filling, sealing and cooling. To enhance the efficiency of the process it is necessary to reduce the cycle time of production. Reducing cycle time which can be achieved partly by inducing in the resin higher TC (crystallization temperature), allowing the molten resin to cure at a higher temperature. This reduces the required cooling time and facilitates the extraction of the product from the mold with a greater speed.

From WO 2005/103132 it is known that the use of talc as nuclearpower agent for a linear polyethylene with a low density causes an increase in the crystallization temperature, thus further leads to a specific reduction in cycle time.

Although there have been many developments in the field related to polyethylene, still continues to exist a need for improved compositions of polyethylene, suitable for the manufacture of products by injection molding, in particular for caps and closures, which reduces the cycle time of the process of injection molding, and the coefficient of friction compared to polyethylene compositions known from the prior art.

It was found that the use of bimodal HDPE in combination with talc as nuclearpower agent and buchanania as an agent that reduces friction, allows to obtain HDPE molding composition with an unexpected and synergistic effect on the crystallization temperature and the coefficient of friction of the composition.

Therefore, the present invention in the first aspect relates to compositions bimodal polyethylene with you the Oka density for obtaining products by injection molding, including:

a) from 92,6 to 99.4 wt.% composition bimodal polymer with high density, comprising a homopolymer of ethylene or copolymer of ethylene with alpha-olefin (COMPONENT a) in combination with

b) from 0.5 to 2 wt.% compositions alpha nuclearpower agent (COMPONENT b),

C) from 0.05 to 0.4 wt.% songs agent that reduces friction, representing the primary amide of a fatty acid (COMPONENT C) and

d) from 0.05 to 5 wt.% the composition of one or more additives selected from antioxidants, acid acceptors, pigments and UV stabilizers (COMPONENT D).

Part a

Therefore, the composition of the present invention, representing a bimodal polymer with a high density, includes as a first Component And a homopolymer of ethylene or copolymer of ethylene with alpha-olefin, including:

i) a homopolymer or copolymer of ethylene with a low molecular weight and

ii) a homopolymer or ethylene copolymer with high molecular weight.

Typically, the polyethylene composition, comprising at least two fractions of polyethylene obtained under different conditions of polymerization that results in the difference of the fractions in the molecular mass (bulk) and the distribution of molecular masses indicated as "multimodal".

Therefore, in this sense, the compositions of the present invention is predstavlyaet multimodal polyethylene. The prefix "multi" refers to the number of different polymer fractions that make up the composition. Thus, the composition consisting only of the two factions, called "bimodal".

The shape of the distribution curve of molecular weight, i.e. the graph of the mass fraction of the polymer, as a function of its molecular weight of such a multimodal polyethylene will show two or more maximum or at least greatly expanded in comparison with the curves of the individual fractions.

For example, if the polymer obtained by using a sequential multi-stage process, the polymerization reactors connected in series and each use different reactor conditions, each of the fractions of the polymers obtained in the different reactors will have its own distribution of molecular weight and mass-average molecular weight. When the distribution curve of molecular weight of this polymer is recorded, the individual curves of these fractions are superimposed on the distribution curve of molecular weight for the total, the resulting polymer product, as a rule, obtaining a curve with two or more different maximums.

Alpha-olefin of the above copolymer of ethylene with an alpha olefin, respectively, which are selected from propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-d the price and cyclic olefins, its content usually ranges from 0.1 to 10 wt.%.

Preferred copolymers are 1-butene and 1-hexene, most preferably 1-butene. The content of the copolymer is preferably from 0.2 to 1.0 wt.%.

Fraction (i) and (ii) both can present copolymers of ethylene homopolymers or ethylene, although preferably at least one of the fractions is a copolymer of ethylene.

Preferably Component a includes a homopolymer of ethylene and a Component of a copolymer of ethylene.

When one Component is a homopolymer of ethylene, preferably a component with a lower mass-average molecular weight (Mw), i.e. the fraction (i).

The fraction of low molecular weight (i) preferably has a MFR210 g/10 minutes or more, more preferably 50 g/10 minutes or more and most preferably 100 g/10 minutes or more.

Additionally, fraction (i) preferably has a MFR21000 g/10 minutes or less, preferably 800 g/10 minutes or less, and most preferably 600 g/10 minutes or less.

Most preferably, the fraction of low molecular weight (i) has a MFR2in the range from 300 to 500 g/10 minutes.

Preferably, fraction (i) is a homopolymer of ethylene with a density of more than 960 kg/m3more preferably more than 960 kg/m3to 980 kg/m3 even more preferably from 965 kg/m3up to 975 kg/m3.

A homopolymer of ethylene may contain trace amounts of contaminating comonomers, for example comonomers are alpha-olefins. Used in the description of the present patent application, the term " homopolymer of ethylene refers to a polymer of ethylene containing at least 99% by weight of units of ethylene.

The fraction of higher molecular weight (ii) preferably represents a Homo - or comonomer ethylene with a density and MFR2lower than for the faction (i). MFR2and density are such that the end Component And has the desired properties, as described below.

Most preferably component (ii) is a copolymer.

Additionally, preferably the mass ratio of the fraction (i) the fraction (ii) in Component a is in the range from 30:70 to 70:30, more preferably from 35:65 to 65:35, most preferably from 40:60 to 60:40.

If there are signs of fractions (i) and/or (ii) the composition of the present invention, these indicators are generally applicable to cases in which they can be directly measured on the corresponding faction, for example, when the fraction obtained separately or obtained in the first stage of the multistage process.

However, the composition may also be preferably obtained when the COI is whether the multi-stage process, where, for example, fraction (i) and (ii) obtained at the subsequent stages. In this case, the properties of the fractions obtained in the second stage (or later stages) multi-stage process, can be inherited from polymers, which are obtained separately at the only stage when applying identical polymerization conditions (for example, identical to the temperature, partial pressure of reagents/solvents, suspension medium, reaction time)related to the stage of the multistage process, in which the resulting fraction, and through the use of the catalyst, which was not previously obtained polymer. In the alternative, the properties of the obtained fractions at a more advanced stage of the multistage process can also be calculated, for example, in accordance with Century Hagström, Conference on Polymer Processing The Polymer Processing Society), Extended Abstracts and Final Programme, Gothenburg, August 19 to 21, 1997, 4:13.

Thus, although a multi-stage process is not directly measured products, the properties of the fractions obtained in the later stages of such multi-stage processes can be defined using one or both of the above methods. Expert in the technical field to which the present invention is able to choose the appropriate method.

Component a is, as stated above, the bimodal HDPE.

Density Component And a CR is doctitle is 930 kg/m 3or more, more preferably is 940 kg/m3or more, even more preferably is 945 kg/m3or more, even more preferably is 950 kg/m3or more, and most preferably is 952 kg/m3or more.

Additionally, the density of Component a is preferably 980 kg/m3or less, more preferably is 975 kg/m3or less, even more preferably is 965 kg/m3or less, and most preferably is 960 kg/m3or less.

Thus, polyethylene, high density Component And preferably has a density in the range of 945 to 975 kg/m3and more preferably from 952 to 960 kg/m3.

Component a preferably has a MFR20.3 g/10 minutes or more, more preferably 0.5 g/10 minutes or more, and most preferably 0.8 g/10 minutes or more.

Additionally, Component a preferably has a MFR225 g/10 minutes or less, more preferably 15 g/10 minutes or less, even more preferably 5 g/10 minutes or less and most preferably 2 g/10 minutes or less.

Therefore, the high density polyethylene Component And preferably has a MFR2in the range from 0.5 to 5 g/10 minutes and more preferably from 0.8 to 2 g/10 minutes.

The polyethylene Component And a CR is doctitle has a molecular weight distribution MWD, represents the ratio of mass-average molecular weight Mw and srednetsenovoj molecular weight Mn of 10 or more, more preferably 15 or more, even more preferably 17 or more, even more preferably 20 or more, and most preferably 22 or more.

Additionally, Component a has a MWD of 60 or less, more preferably 40 or less, even more preferably 35 or less, and most preferably 30 or less.

Therefore, Component a preferably has a MWD in the range from 10 to 35 and more preferably from 15 to 30.

To obtain high density polyethylene Component And can be used in a variety of polymerization reactions and catalytic systems.

The polymerization catalyst comprises a complex catalyst of a transition metal, such as Ziegler-Natta (ZN), metallocene, demetallized, Cr-catalysts and the like.

In a preferred variant embodiment of the present invention bimodal HDPE polymer is produced using a catalyst of Ziegler-Natta (ZN), for example traditional ZN catalyst.

The preferred catalysts of the Ziegler-Natta include the component of the transition metal and the activator. Component of the transition metal includes a metal from the team of 4 or 5 of the Periodic table (IUPAC) as the active metal. Additionally, it may contain the substance of other metals or elements of group 2, 13 and 17. Preferably Component of the transition metal is solid. More preferably, it is deposited on a substrate, such as a carrier, an inorganic oxide, or halogen, or magnesium. Among others, examples of such catalysts are described in WO 95/35323, WO 01/55230, EP 0810235; EP 0688794 and WO 99/51646.

In one variant embodiment of the present invention the catalyst is a catalyst of the type Ziegler-Natta, where the active components dispersed and solidified on the substrate based on magnesium for the emulsion/solidification adapted for polyethylene catalysts, for example, in WO 03/106510 Borealis, for example, in accordance with the principles set out in the attached claims.

In another preferred variant of embodiment of the present invention the catalyst is not silicon catalyst on the substrate, that is, the active components are not marked on the outer substrate of silicon. Preferably the substrate material of the catalyst is a material of the substrate on the basis of Mg. Examples of such preferred catalysts of the Ziegler-Natta described in EP 0810235.

In another preferred variant of embodiment of the present invention, the polyethylene composition obtained by using ZN catalyst described in EP 688794.

Can also be used in traditional socializaton, under which Oki, the media, donors of electrons.

Way get polyethylene high plane Component of the present invention, is not critical. Component a can be obtained by mechanical mixing of the individual fractions (i) and (ii), the mixing in the reactor or mixing in-situ, the combination of these two processes or other means that achieve an appropriate homogeneity.

For example, the composition may be obtained by mechanical mixing of the two fractions in a given number, for example, with conventional devices for compounding or mixing, such as a Banbury mixer, 2-roller solemniter, Buss mixer or twin screw extruder.

Fraction (i) and (ii)used for mechanical mixing, obtained separately using any traditional method homopolymerization ethylene, respectively, copolymerization of ethylene, for example, in the pelvic phase, slurry phase, liquid (mass) phase with conventional reactors, such as the circulation reactor, gas-phase reactor, properidine reactor or a batch reactor, in the presence of a catalyst of polymerization.

Also the composition may be obtained by mixing in-situ fractions (i) and (ii). Under the mixed in-situ with obtaining bimodal polymer means that the coat is AI obtained either simultaneously in one reaction (for example, using different catalysts) and/or obtained in the two-stage process.

Two-stage process is a polymerization process in which a polymer comprising two fractions obtained with the receipt of each fraction in a separate reaction stage, usually with different conditions at each stage in the presence of the reaction product of the previous step, which includes the catalyst for polymerization. The polymerization reaction used at each stage may include traditional reaction homopolymerization or copolymerization of ethylene.

Such traditional reaction homopolymerization or copolymerization of ethylene include, without limitation gas-phase polymerization, suspension polymerization, liquid phase polymerization, and combinations thereof using conventional reactors, such as gas-phase reactors, circulation reactors, reactors with agitators and reactors periodic operation in series or in series and in parallel. The polymerization system used in the present invention, preferable is a system of dual sequential polymerization. Examples of systems dual sequential polymerization include, without limitation gas-phase polymerization/gas-phase polymerization; gas-phase polymerization/liquid-phase polymerization, liquid-phase of polymerise the s/gas-phase polymerization; liquid-phase polymerization/liquid-phase polymerization; suspension polymerization/suspension polymerization, liquid-phase polymerization/suspension polymerization; a suspension polymerization/liquid-phase polymerization; suspension polymerization/gas-phase polymerization and gas-phase polymerization/suspension polymerization.

Preferably the system of the double sequential polymerization are liquid-phase polymerization/liquid-phase polymerization, suspension polymerization/suspension polymerization, gas phase polymerization/gas-phase polymerization or suspension polymerization/gas-phase polymerization.

The first component, i.e. a polymer of ethylene with a low molecular weight (fraction (i))can be obtained in the first stage of the double sequential polymerization, and the second component, i.e. a polymer of ethylene to high molecular weight (fraction (ii))can be obtained in the second stage of the dual system of sequential polymerization. Alternatively, the second component, i.e. a polymer of ethylene to high molecular weight (fraction (ii))can be obtained in the first stage of the double sequential polymerization, and the first component, i.e. a polymer of ethylene with a low molecular weight (fraction (i))can be obtained on verastegui system dual sequential polymerization

For the purposes of the present invention, a reactor, in which the conditions are adapted to receive the first component, known as the first reactor. Alternatively, the reactor in which the conditions are adapted for receiving the second component, known as the second reactor.

Preferably the main stage of the multistage polymerization process of obtaining the composition of the present invention are described in EP 517868, i.e. obtaining fractions (i) and (ii) is conducted as a combination of suspension polymerization for the faction (i)/gas-phase polymerization for the fraction (ii). Suspension polymerization is preferably carried out in the so-called circulation reactor. Additionally, it is preferable phase suspension polymerization is preceded by a gas-phase stage. This multistage process is known as Borstar® PE process.

Another preferred multistage process of obtaining compositions of the present invention is a dual process in a suspension reactor Mitsui CX or Hostalen.

In some cases, and mainly the main stages of polymerization can precede prepolymerisation, which receive up to 20% by weight, preferably from 1 to 10% by weight, more preferably from 1 to 5% by weight of the total weight of the composition. Preferably prepolymer to depict the place of the homopolymer of ethylene (PE high density). If prepolymerisation preferably the entire catalyst is loaded into the circulation reactor and carry out the suspension prepolymerisation. This prepolymerisation lead to obtaining less small particles in the subsequent reactors and greater homogeneity of the final product.

The resulting end product consists of a homogeneous mixture of the polymers of the two main reactors, different curves of the distribution of molecular weights of these polymers together form a distribution curve of molecular weight with a broad maximum, i.e. the final product is a mixture of bimodal polymer.

Preferably, the base resin, i.e. all polymer components of the composition according to the present invention was a mixture of bimodal polyethylene, consisting of fractions (i) and (ii), optionally including a small fraction of prepolymerisation the above number.

Also preferably, the mixture is bimodal polymer was obtained by polymerization as described above, under different conditions of polymerization in two polymerization reactors connected in series. Thanks to the flexibility of the conditions of the reactions, thus, most preferably, the polymerization was performed in combination circulating reactor/gas-phase reactor or in combination suspension reactor mesh is the LCA/suspension reactor with a stirrer.

Preferably the conditions of polymerization in the preferred two-stage method is chosen so that the polymer with a relatively low molecular weight obtained in one stage, preferably the first stage, are not contained comonomer due to the high content of OPT-agent (hydrogen gas), and the polymer with high molecular weight, obtained at a different stage, preferably the second stage, contained comonomer. However, the order of these stages may be reversed.

Component a may be first compounded with Component D.

This composition is specified as Component a'.

Composition And' has resistance to cracking under the influence of the environment ESCR (ASTM D-1693, Condition B, 10% Igepal) 40 hours or more, preferably 60 h or more, more preferably 80 h or more, more preferably 100 hours or more, and most preferably 200 hours or more.

ESCR Composition And' could be up to 300 h or even up to 400 hours

Preferably ESCR Composition And' is in the range from 100 h to 400 h, preferably from 200 to 300 hours

Preferably Component a' of the present invention has a modulus of elasticity of at least 800 MPa, more preferably at least 825 MPa, more preferably at least 850 MPa and most preferably at least 900 MPa.

As p is Avila, the upper limit of the elastic modulus of 1000 MPa or even 1200 MPa.

As a rule, the limits of modulus of elasticity ranges from 850 to 1200 MPa, preferably from 900 to 1000 MPa.

Preferably Component A' of the present invention has impact strength with notch on Charpy (23°C) 4 kJ/m2or more, more preferably 5 kJ/m2or more, more preferably 7 kJ/m2or more, and most preferably 8 kJ/m2or more.

Additionally, Component a' has an impact strength with notch on Charpy (23°C) up to 15 kJ/m2or even up to 20 kJ/m3.

Preferably Component A' has an impact strength with notch on Charpy (23°C) in the range from 7 to 20 kJ/m3, preferably in the range from 8 to 15 kJ/m2.

Additionally, Component a' preferably has impact strength notched by Sharpie (-20°C) 2 kJ/m2or more, more preferably 2.5 kJ/m2or more, even more preferably 3 kJ/m2or more and most preferably of 3.5 kJ/m2or more.

Component a' has an impact strength notched by Sharpie (-20°C) up to 8 kJ/m2more preferably up to 10 kJ/m2.

Preferably Component a' has an impact strength notched by Sharpie (-20°C) within 3 to 10 kJ/m3preferably within ot,5 to 8 kJ/m 2.

The COMPONENT IN the

Additionally, the composition of the present invention contains alpha-nuclearmoose agent.

Examples of suitable alpha-nuclearpower agents represent

inorganic additives such as talc, silica or kaolin;

salts of monocarboxylic acids or polycarboxylic acids, such as sodium benzoate or tertbutylbenzene aluminium;

- dibenzylidene or C1-C8-alkyl substituted derivatives, such as mutidimensional, ethyldimethylammonium or dimethylbenzimidazole;

- salt complex of diesters of phosphoric acid, such as sodium 2,2'-Methylenebis(4,6,-di-tertbutylphenyl)phosphate or aluminum-hydroxy bis[2,2'-methylene-bis(4,6-di-t butylphenyl)phosphate;

derivatives of nonita, such as 1,2,3-trideoxy-4,6:5,7-bis-O[(4-propylphenyl)methylene]-nonet, or

- vinylcyclohexane polymer and vinylalcohol polymer.

Preferred alpha-nuclearwaste agents are inorganic alpha nuclearmoose agents, more preferably as nuclearpower agent using talcum powder.

Can be used in different types of talc powder, such as talc with high aspect ratio micronized talc and compressed talc, or mixtures thereof.

Before compounding used talc has a particle size d95 50 micrometers Il is less preferably 25 microns or less and most preferably 15 μm or less, as measured using a laser diffraction according to ISO 13320-1:1999.

Preferably the particle size d95 before compounding Component In is preferably not less than 1 micrometer, more preferably not less than 2 micrometer, as measured using a laser diffraction according to ISO 13320-1:1999.

Additionally, the average particle size d50 can be selected in the range from 0.5 to 40 μm, preferably from 0.7 to 20 μm and more preferably from 1.0 to 10 μm, as measured using a laser diffraction according to ISO 13320-1:1999

The average (or median) particle size is the particle diameter where 50% of the particles larger than 50% less. His point as d50 or D50.

Preferably, the talc has a specific surface area (BET) before compounding at least 5.0 m2/g, more preferably at least 7.0 m2/g and most preferably at least 9.0 m2/g, as determined according to DIN 66131/2. Specified specific surface area, as a rule, does not exceed 100,0 m2/year

Preferably, the talc has a mean aspect ratio before compounding, defined as the ratio between the largest and the smallest average size of talc before compounding the m polypropylene composition is at least 5,0; even more preferably at least 7.5 and most preferably at least 10,0. Typically, the average ratio of the geometric dimensions does not exceed 50,0.

The average ratio of the geometric dimensions are measured according to the method described in detail in the experimental part.

Before adding the talc can be treated with various agents for surface treatment, such as organic titanate coupling agents, silane coupling agents, fatty acids, metal salts of fatty acids, fatty acid esters and the like, in a way known from predshestvuyuschiy prior art. The talc can be added without carrying out surface treatment.

Preferably talc add without carrying out surface treatment.

Examples of suitable commercially available talc are Tital 15 (Ankerport), Tital 10 (Ankerport), Luzenac A7 (Luzenac), Jetfine 3CA (Luccnac, Rio Tinto), HAR T84 (Lucenac, Rio Tinto) and the like.

The COMPONENT

The composition according to the present invention further comprises an agent that reduces friction, which in the case of the present invention represents a primary amide of a fatty acid.

Preferably primary amide of a fatty acid selected from amides of linear saturated fatty acids containing from 10 to 25 carbon atoms, and mixtures thereof.

Therefore, the agent reducing friction is, preferably selected from the group consisting of:

CIS-13-docosenoic amide or erucamide (catalog No. 112-84-5; 337,6 g/mol),

CIS-9-octadecenoamide or oleamide (catalog No. 301-02-0; 281,5 g/mol),

octadecenoamide or stearamide (catalog No. 124-26-5; 283,5 g/mol),

docosanoid or behined (catalog No. 3061-75-4; 339,5 g/mol),

N,N'-ethylene-bis-stearamide (catalog No. 110-30-5; 588 g/mol),

N-octadecyl-13-docosenoic (catalog No. 10094-45-8; 590 g/mol), and

oleylamine (catalog No. 16260-09-6; 503 g/mol).

Essentially are preferred behenate and/or erucamide; more preferably used behenate.

COMPONENT D

The composition according to the present invention further comprises one or more additives selected from antioxidants, acid acceptors, pigments and UV stabilizers.

Preferably as a Component of D using the antioxidant and/or an acid acceptor.

Antioxidants (AO) can be selected from the group consisting of sterically obstructed phenols, phosphites/phosphonites, sulfur-containing AO, lactone, aromatic amines, stabilizers of difficult amines (mainly known as UV-stabilizers), HAS or mixtures thereof.

As a rule, for the protection of polymers against thermal and/or oxidative destruction use antioxidants such as Irgafos® 168, Iganox® 1010 or Doverphos® S-9228. Irganox® 1010 is tetrakis(methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), which is commercially available from Ciba Geigy Inc. Irgafos® 168 is Tris(2,4 di-tert-butylphenyl)FOSFA, which is commercially available from Ciba Geigy Inc.

Doverphos® S-9228 is bis(2,4-dokumenter)the pentaerythritol diphosphite, which is commercially available from Dover Chemicals.

Examples podhodjashij acid acceptors can be selected from the group of CA stearate, 12-hydroxy calcium stearate, sodium stearate, zinc stearate, magnesium oxide, zinc oxide, synthetic hydrotalcite and the like.

The preferred used of the acid acceptor is calcium stearate.

COMPOSITION of HIGH DENSITY POLYETHYLENE

Composition of high density polyethylene of the present invention includes, in addition to Component a and Component D Component b and Component C.

Therefore, the composition of high density polyethylene of the present invention includes as a Component a bimodal component of high density, as a Component In the alpha nuclearmoose agent, as a Component With an agent that reduces friction, and as Component D one or more additives selected from antioxidants, acid acceptors, pigments and UV stabilizers; in more detail the components described above.

Preferably compositionpolicy high density according to the present invention includes as a Component a bimodal component with high density, as a Component in the talc as the Component With behenate and as Component D antioxidant in combination with an acid acceptor.

Component a is present in an amount of from 92,6 to 99.4 wt.% composition;

Component is present in an amount of from 0.5 to 2 wt.%, preferably from 0.6 to 1.8 wt.%, more preferably from 0.7 to 1.7 wt.% and most preferably from 0.8 to 1.5 wt.% composition;

Component is present in amounts of from 0.05 to 0.4 wt.%, preferably from 0.06 to 0.3 wt.% and more preferably from 0.07 to 0.25 wt.%;

Component D is present in an amount of from 0.05 to 5 wt.%, preferably from 0.06 to 4 wt.%, more preferably from 0.07 to 3 wt.% composition; the number of each entered the additive is preferably in the range of 0.05 to 0.2 wt.% and more preferably in the range from 0.07 to 0.1 wt.%.

Upon receipt of a composition of the present invention preferably stage of compounding performed when the Component A, which is the basis of resins, that is, a mixture, which is usually obtained as a powder base resins from reactor ekstragiruyut in the extruder and then granularit way known from the prior art.

Preferably the additive, including Components b, C and D are mixed with obtaining basics of the resin before or during extrusion on what kostadinos the process of compounding. In the alternative, may be obtained from the mother liquor mixture, where the base resin is first mixed with some of the additives.

Preferably, Component a of the present invention, obtained from the reactor, compounding in the extruder together with additives way known from the prior art.

The extruder may represent, for example, traditionally used extruder. As an example of stage extruder for compounding according to the present invention can be used extruder, available from Japan steel works, Kobe steel or Farrel-Pomini, such as JSW 460P.

Typically, the polymeric material from the extruder is obtained in the form of granules. Then, these pellets are preferably subjected to further processing by injection molding with the receipt of goods and products from thermoplastic polyolefin compounds according to the present invention.

ADVANTAGES

The composition according to the present invention includes a bimodal HDPE, alpha nuclearmoose agent, preferably talc, and the agent that reduces friction, preferably behenate. This combination demonstrates the unexpected and synergistic effect on the crystallization temperature and the coefficient of friction of the composition.

From prior art it is known that the crystallization temperature of the polyolefin, generally, can be increased after the population nuclearpower agents. Additionally, the increase in the crystallization temperature can reduce the process time (cycle time) in obtaining the final products from the molten polymer.

As described in WO 2005/103132, it is known the use of talc as nuclearpower agent in linear low density polyethylene, and it was found that it causes an increase in the crystallization temperature.

Unexpectedly, the use of combination nuclearpower agent and the agent that reduces friction, preferably a combination of talc and buchanania, causes a significant increase in the crystallization temperature compared to using only one nuclearpower agent, in particular talc, and compared with the use of only one agent that reduces the friction, in particular behined.

Therefore, in another embodiment, embodiments of the present invention use a combination of nuclearpower agent, in particular talc, and the agent that reduces friction, in particular buchanania, to increase the crystallization temperature of bimodal HDPE at least 2°C, preferably at least 2.5°C.

Additionally, it is known that the addition of an agent that reduces the coefficient of friction (COF)can be reduced to optimize the properties of the agent that reduces friction in polymer compositions, and therefore, to facilitate the unscrewing of the lid.

Near the question when using a combination nuclearpower agent, in particular talc, and the agent that reduces friction, in particular buchanania, it was found a significant reduction in COF compared with only one nuclearpower agent, in particular talc, and compared with the use of only one agent that reduces the friction, in particular behined.

COF material is a measure of the resistance of one material relative to another material by friction.

Friction is measured according to ISO 8295 and is defined as the resistance of the two in contact with each other surfaces during sliding. Distinguish between static friction that must be overcome in the moment of sliding or dynamic friction, which is stored in the time slip at a preset speed.

Therefore, in another embodiment, embodiments of the present invention use a combination nuclearpower agent, in particular talc, and the agent that reduces friction, in particular buchanania to obtain compositions bimodal HDPE with low coefficient of friction compared to the composition of bimodal HDPE obtained when using only one nuclearpower agent, in particular talc, and compared with the use of only one agent that reduces the friction, in particular behined

APPLICATION

Polyethylene composition with a high density according to the present invention can be used in esavana to obtain shaped products.

Additionally, the present invention relates to products obtained by casting under pressure, preferably to the caps and sealing means comprising a polyethylene composition, as described above, and the use of such a polyethylene composition for the manufacture of products by injection molding, preferably of caps and closures.

Injection molding the above composition can be carried out using any conventional device for injection molding. The typical process of injection molding can be carried out at a temperature of from 190 to 275°C.

In the process of molding the composition of high density polyethylene of the present invention serves in the extruder via the feeder. The extruder moves, heats, melts and puts pressure on the polyethylene composition with a high density according to the present invention with the receiving molten stream. The molten stream is pushed out of the extruder through a nozzle in a relatively cold closed form under pressure, filling, thus, form. The melt cools and solidifies in the form prior to complete curing. Then the form is opened and removed from it is obtained by molding the product, such as the lid for the bottle. Obtained by injection molding the cover may include a skirt, which is located on its external is her surface around the circumference, and may optionally include internal threads for securing the cap on the container.

Closures such as caps for bottles, comprising a composition of high density polyethylene of the present invention demonstrate increased crystallization temperature, which reduces the cycle time of production and reduce the coefficient of friction, which facilitates the opening of the bottle.

These closures for bottles adapted to withstand the pressure of carbonated drinks. These closures for bottles additionally facilitate the closing and sealing of the bottle, i.e. the optimal screwing provided a machine for screwing caps on bottles or bottle uncapping, i.e. the optimal loosening connected to person, otsenivaya the cover.

In addition, the invention encompasses the use of a composition bimodal HDPE, including Component And representing bimodal HDPE, including:

i) a homopolymer or copolymer of ethylene with a low molecular weight and

ii) a homopolymer or copolymer of ethylene to high molecular; and

Component - nuclearmoose agent, preferably talc;

Component With an agent that reduces friction, preferably behenate, and

Component D, comprising one or more additives selected from antioxidants, acid acceptors, pigments in the UV-stabilizers,

for more articles by injection molding with high crystallization temperature and low COF.

EXPERIMENTS AND EXAMPLES

1. Definitions and measurement methods

(a) Distribution of molecular weight

The mass-average molecular weight Mw and the molecular weight distribution (MWD=Mw/Mn, where Mn is srednecenovogo molecular weight, a Mw represents a mass-average molecular weight) is measured using a method based on ISO 16014-1:2003 and ISO 16014-4:2003.

Use the device Waters 150CV plus using 3×NT&F styragel from Waters (divinylbenzene) and trichlorobenzene (TCB) as solvent at a temperature of 140°C. the Column is calibrated using universal calibration with narrow PS standards MWD (constant To Mark Howings: 9,54*10-5 and a: 0,725 for PS To: 3,92*10-4 and a: 0,725 for PE). The ratio of Mw and Mn is an indicator of the breadth of distribution, since for every value has an effect opposite end of the "population".

The distribution of molecular masses of polymers of ethylene determined using gel chromatography (GPC). The chromatographic system consists of a high temperature helpanimals chromatograph 150°C Waters (Millford, MA)equipped with a detector 2-angle laser light scattering Precision Detectors (Amherst, MA) Model 2040.

For calculation use angle light scattering dete the Torah 15°. Data collected using the software Viscotek TriSEC, version 3, and 4-channel data Manager Viscotek Data Manager DM400. The system is equipped with an integrated charger degassing of the solvent from Polymer Laboratories. Carousel works Department at 140°C, and the separation column operates at 150°C. the columns Used are four columns Shodex HT M 300 mm, 13 μm, and one column Shodex HT M 150 mm, 12 μm. Used solvent is 1,2,4-trichlorobenzene. Samples were obtained when the concentration of 0.1 g polymer in 50 ml of solvent. The chromatographic solvent and solvent to obtain a sample containing 200 µg/g of bottled hydroxytoluene (EIT). Both sources solvent was purged with nitrogen. Samples of polyethylene gently stirred at 160°C for 4 h, the Volume of injection is 200 microliters, and the flow rate is 0.67 ml/min Calibration GPC-columns carried out using 21 polystyrene standards with narrow molecular weight distribution with molecular masses in the range from 580 to 8400000 g/mol, which is placed at least 6 "cocktail" mixtures with a decade of separation between individual molecular weights. Standards acquire from Polymer Laboratories (Shropshire, UK). Polystyrene standards obtained when 0,025 g in 50 ml of solvent for molecular weights Bo is her or equal to 1000000 g/mol and 0.05 g in 50 ml of solvent for molecular weights less than 1000000 g/mol. Polystyrene standards dissolved at 80°C. with mild stirring for 30 minutes First mixture is maintained standards with narrow molecular weight distribution and to reduce the most high-molecular component with minimizing degradation. The peak molecular weight polystyrene standards is converted into molecular weight polyethylene using the following equation (as described by Williams and Ward, J. Polym. Sci., Polym. Let., 6, 621 (1068):

Mpolyethylene=A×(Mpolystyrene)B,

where M represents the molecular weight, a has a value of 0.41 and is 1.0. To determine mnogozamechatelnih variance was done systematically approximatevalue in the same way, as published in the works Balke, Mourey et al., Chromatography Polym., Chpt. 12 (1992), and Balke, Thitiratsakui, Lew, Cheung, Mourey, Chromatography Polym., Chpt. 13 (1992), optimization of the log results of the dual detector from Dow-polystyrene 1683 with a wide molecular weight distribution, the results of the calibration columns standards with narrow molecular weight distribution by means of a calibration curve standards with narrow molecular weight distribution using a partial computer program. Data on the molecular mass to determine deviations were obtained in the same manner as published in the works of Zimm C. N., J. Chem. Phys., 16, 1099 (1948), and P. Kratochvil, Classical Light Scattering from Polyme Solutions, Elsevier, Oxford, NY (1987). The total input concentration used to determine molecular weight, get the square of the refractive index of the sample and the calibration of the detector refractive index of homopolymer linear polyethylene molecular weight of 115,000 g/mol, which was determined by comparison with a NIST-standard 1475 homopolymer polyethylene. Chromatographic concentrations were taken sufficiently low to exclude the effects of the 2nd virial coefficient (concentration affects the molecular weight). Calculations of molecular weight were carried out using a partial computer program. Calculation srednetsenovoj molecular weight, the mass-average molecular weight and z-average molecular weight is performed in accordance with the following equations, assuming that the signal) is directly proportional to the mass fraction. The Refractometer reading minus baseline can be directly substituted for the mass fractions in equations below. It should be noted that molecular weight can be obtained from traditional calibration curve or absolute molecular weight can be obtained on the indicator light scattering Refractometer. Updated evaluation of the z-average molecular weight, the reading light scattering minus the baseline can be under what taulani instead of the object, the mass-average molecular weight and weight fraction in equation (2) below:

a)Mn=ΣiwfiΣi(wfiMi)b)Mw=Σ(iwfi*Mi)Σiwfi

c)Mz=Σ(iwfi*Mi2)Σi(wfi*Mi)(2)

b) Density

The density is measured according to ISO 1183-187. The sample is produced by injection molding according to ISO 1872-2:2007.

c) the flow Rate of the melt

The rate of melt flow (MFR) determined with the according ISO 1133 and is indicated in g/10 minutes MFR is an indicator of fluidity and, therefore, the processability of the polymer. The higher the flow velocity of the melt, the lower the viscosity of the polymer. MFR is determined at a temperature of 190°C, and it can be determined at different loadings such as 2,16 kg (MFR2), 5 kg (MFR5) or 21.6 kg (MFR21).

d) Impact strength with notch on Charpy

Impact strength with notch on Sharpie was determined according to ISO 179-EA:2000 samples with a V-shaped incision size 80×10×4 mm3dog bone is at a temperature of +23°C Impact strength notched at Charpy (23°C)and -20°C (Impact strength Charpy (-20°C)).

e) Resistance to cracking under the influence of the environment (ESCR)

ESCR are determined according to ASTM 1693, condition at a temperature of 50°C and with 10% Igepal co-630.

f) Mechanical tensile properties

Mechanical tensile properties measured using specimens obtained by injection molding according to ISO 527-2:1993. The elastic modulus is measured at a speed of 1 mm/minute.

g) COF is measured according to ISO 8295.

h) Temperature crystallization

The melting temperature Tmthe crystallization temperature Twithand the degree of crystallization determined according to ISO 11357-3:1999 using calorimeter Mettler TA with carrying out differential scanning calorimetry (DSC) samples 3±0,5 is, The crystallization temperature and melting point are obtained at 10°C/minute on scanogram heating and cooling in the range from 30°C to 225°C. the crystallization Temperature and melting take as the peak of the endotherm and ectotherm.

i) the content of the co monomer in the obtained products determine when using the known method of infrared spectroscopy with Fourier transform (FTIR)calibrated according to the results of13C-NMR using spectrometer Nicolet Magna IR 550 with software Nicolet Omnic FTIR.

Film thickness of about 250 μm is obtained from specimens obtained by injection molding. Similar films obtained from calibration samples with known content of co monomer. Thickness was measured at least five points of the film. Next film was polished with emery paper to reduce reflection. In order to avoid contamination of the films was not touched with bare hands. For each analyzed and the calibration sample received at least 2 films. Films were obtained from the pellets using film press Graceby Specac at 150°C pre heating 312 minutes, the pressing time was 1 min, and the cooling time was between 4 to 5 minutes. For samples with very high molecular weight pre-heating and temperature were increased.

The content of the co monomer is definitely the Lyali on the basis of absorption at a wavelength of about 1378 cm -1. In the calibration and test samples contained the same comonomer. The analysis was performed with a resolution of 2 cm-1in the range of wave numbers from 4000 to 400 cm-1and the number of scans equal to 128. For each film was shot at least 2 of the spectrum.

The content of the co monomer was determined from the spectrum in the range of wave numbers from 1430 to 1100 cm-1. Absorption was defined as the peak height, choosing the so-called short or long base line or by using both. Short baseline conducted from about 1410 to 1320 cm-1through the minimum number of points, the long baseline between 1410 and 1220 cm-1. It is necessary to perform calibration for each type of baseline. The content of co monomer in the sample must be within the range of the content of the co monomer in the calibration samples.

(j) the size of the particles (talc before mixing)

The particle size d50 and d95 rely on the distribution of particle size measured by laser diffraction according to ISO 13320-1:1999.

k) Specific surface area of talc

Specific surface area of talc are determined according to DIN 66131/2.

l) the Average aspect ratio of talc

The average aspect ratio is defined by the images of pure inorganic filler obtained by the method of transmission is elektronnoy microscopy (THEMES) on a grid analyzers FACT, covered with a film of an aqueous suspension by rotation of the sample at intervals of 1° from -75° to +75°, for example, on a JEOL JEM-2100 and reconstruction of three-dimensional structures (for example, using JEOL TEMography), measurement was carried out on 100 particles and calculated the average value. The ratio of the geometric dimensions of a particle is the ratio of the longest and shortest radii of the particles that pass through the geometric center of the particle.

2. EXAMPLES

General Protocol

The first stage polymerization was carried out in 500 DM3circulation reactor in the presence of ethylene, propane and hydrogen in amounts shown in Table 2. The polymer containing the active catalyst is separated from the reaction medium and is moved to a gas-phase reactor operating under pressure of 20 bar with the introduction of additional ethylene, hydrogen and co monomer (table 3).

The catalyst used in Example 3 of EP-B-0688794 (printed on 20 micron silica)is used as socializaton with triethylaluminium.

Obtaining catalyst

Getting complex in the reactor add 87 kg of toluene. Then the reactor add 45,5 kg 20,3% BOMAG-A in heptane. In the reactor serves 161 kg 99.8% of 2-ethyl-1-hexanol speed 24-40 kg/h Molar ratio of BOMAG-A and 2-ethyl-1-hexanol is 1:1,83.

In the reactor load of 275 kg of silica (Grace 955), aktivirovannogo at a temperature of 600°C. Then the reactor type 411 kg 20% EADC (2.0 mmol/g Si), dissolved in 555 l of pentane at room temperature for 1 hour. The temperature was raised to 35°C. the Treated silica is stirred for 1 hour. The treated silica is dried at 50°C for 8.5 hours. Obtained above 655 kg of the complex (2 mmol Mg/g Si) is added at a temperature of 23°C for 10 minutes. In a reactor of the type 86 kg of pentane at a temperature of 22°C for 10 minutes. The suspension is stirred for 8 hours at 50°C. Finally, add 52 kg TiCl4for 0.5 hours at a temperature of 45°C. the Suspension is stirred at 40°C for 5 hours. The catalyst is dried by blowing with clean nitrogen. The composition of the dry catalyst is 2.4% of Ti, and 2.3% Mg, 14,1% Cl and 2.9% Al.

Conduct preliminary polymerization catalyst under the following conditions.

td align="left"> Submission C3
Table 1
The terms of the preliminary polymerization
Temperature°C70
Pressurebar63
Submission C2kg/h2
kg/h
Feed H2kg/h
Submission catalystg/hour14

Table 2
The conditions of polymerization: Circulation reactor
Temperature°C95
Pressurebar58
The flow of catalystg/hour14,0
Submission of socializatong/hour6,0
Submission C2kg/h44,4
Submission C3kg/h88,7
H2g/hour1321
[C2]mol.%6,8
The ratio of H2/C2mol/KMOL347
Split (number of polymer obtained in the respective reactor, referred to the total mass)%52
MFR21/10 minutes400
Densitykg/m3>965

Table 3
The conditions of polymerization: Gas-phase reactor
Temperature°C85
Pressurebar20
Submission C2kg/h43
Submission C4CT/h1,6
H2g/hour15,1
[C2]mol.%8,8
The partial pressure C2/td> bar1,8
The ratio of H2/C2mol/KMOL81
The ratio C4/C2mol/KMOL80
Split (number of polymer obtained in the respective reactor, referred to the total mass)48
MFR2g/10 minutes1,5
Densitykg/m3954

In the product (Component a) is added 750 parts per million Doverphos S-9228 (AO) and 750 parts per million Ca-Stearate (AS) (= Reference material; Component a').

Pellets of the above powdery polymer (Control material corresponding to Component (A') is mixed with nuclearpower agent and an agent that reduces friction in small-scale 24 mm twin screw extruder Prism with a maximum temperature of 90°C.

As nuclearpower agent use HAR T (talc from Luzenac, Rio Tinto) and as an agent that reduces friction, use behenate (Finawax In from Fine Organics).

The composition according to the present invention consists of 98.9 wt.% The component', 1 mass. talc and 0.1 wt.% behined.

As Comparative examples, use key material corresponding to Component A' (SEH), CEX2: 99 wt.% control material mixed with 1 wt.% talc and CEX3: 99.9 wt.% control material and 0.1 wt.% behined.

The crystallization temperature of the composition of the present invention (IEX1), SEH, SEH and SEH measured using DSC as described above. The results are shown in Table 4.

Table 4
ExampleTrackThe crystallization temperature [°C]The modulus of elasticity (MPa)
The control material (SEH)Component And (HDPE)+117,5900
Component D (AO + AS)
SEH99 wt.%
Control material + 1 wt.% Component In (talc)
118,4957
SEH99.9 wt.% Control material + 0.1 wt.% Component (behenate)118,8905
The song is about the present invention (IEX1) 98.9 wt.% Control material + 1 wt.% Component In (talc) + 0.1 wt.% Component (behenate)20,2950

From Table 4 one can see that the combination of talc and buchanania has an unexpected synergistic effect on the crystallization temperature of the HDPE.

The coefficient of friction is measured according to ISO 8295, as described above.

Samples are tested on the universal machine for testing: Zwick Z2.5 showing the pressure sensor 10 H.

Plate obtained by molding (60×60×2 mm), fitted directly on the hammer 200, the contact Area is 40 cm2the testing speed of 100 mm/min

To reduce the standard deviation using 5 parallel samples.

The results are shown in Table 5.

Table 5
ExampleThe coefficient of friction
InternalExternal
StaticDynamicStaticDynamic
CEX10,850,560,350,30
CEX20,600,450,360,26
CEX30,510,350,340,24
IEX10,600,340,300,20

From Table 5 one can see that the combination of talc and buchanania has an unexpected synergistic effect on COF HDPH.

1. Composition of bimodal polyethylene with high density for obtaining products by injection molding, including:
a) from 92,6 to 99.4 wt.% composition bimodal polymer with high density, comprising a homopolymer of ethylene or copolymer of ethylene with alpha-olefin (Component a) in combination with
b) from 0.5 to 2 wt.% composition of inorganic alpha nuclearpower agent (Component b),
c) from 0.05 to 0.4 wt.% songs agent that reduces friction, representing amide linear saturated primary fatty acid (COMPONENT C), and
d) from 0.05 to 5 wt.% the composition of one or more additives is selected from antioxidants, acid acceptors, pigments and UV stabilizers (Component D).

2. Composition of bimodal polyethylene with high density on p. 1, where Component a comprises:
i) a homopolymer or copolymer of ethylene with a low molecular weight and
ii) a homopolymer or ethylene copolymer with high molecular weight.

3. Composition of bimodal polyethylene with high density on p. 2, where the fraction of low molecular weight (i) Component (A) is a homopolymer of ethylene with MFR2in the range from 300 to 500 g/10 minutes and a density of more than 960 to 980 kg/m3and the fraction with high molecular weight (ii) Component (A) is a copolymer of ethylene with co monomer alpha-olefin selected from 1-butene or 1-hexene, and where the mass ratio of the fraction (i) the fraction (ii) is in the range from 40:60 to 60:40.

4. Composition of bimodal polyethylene with high density PP.1-3, where Component (A) obtained when carrying out two-stage process comprising a first stage suspension polymerization to obtain fractions with low molecular weight (i) and the second stage gas-phase polymerization to obtain fractions with high molecular weight (ii), where the second stage polymerization is carried out in the presence of the product of the first stage and the first stage polymerization may be preceded by a preliminary stage of Polimeri the promotion.

5. Composition of bimodal polyethylene with high density PP.1-3, where the Component is talc.

6. Composition of bimodal polyethylene with high density PP.1-3, where the Component is behenate.

7. Composition of bimodal polyethylene with high density PP.1-3, where Component D is an antioxidant and/or an acid acceptor.

8. Composition of bimodal polyethylene with high density PP.1-3, includes a Component (A) bimodal polymer with a high density, comprising a homopolymer of ethylene with low molecular weight and copolymer of ethylene/1-butene with a high molecular weight, Component (C) is talc, the Component (C) is behenate, and Component D is an antioxidant and/or an acid acceptor.

9. The use of a composition on HDPE PP.1 and 2, incorporating And representing bimodal HDPE, including:
i) a homopolymer or copolymer of ethylene with a low molecular weight and
ii) a homopolymer or copolymer of ethylene to high molecular;
Component - inorganic nuclearmoose agent, preferably talc, kaolin and silica;
Component With an agent that reduces friction, representing amide linear saturated primary fatty acids, and
Component D, comprising one or more additives selected from antioxidants, acid acceptors, pigments and UV stabilizers,
DL the manufacture of products by injection molding.

10. The use of a composition HDPE under item 8 for obtaining products by injection molding.

11. Articles obtained by injection molding, comprising a HDPE composition according to any one of the preceding paragraphs 1-8.

12. The product obtained by molding under item 11, where the product is the cover or capping means.

13. Applying a combination of nuclearpower agent, preferably talc, and the agent that reduces friction, preferably of buchanania, to increase the crystallization temperature of the composition bimodal HDPE, including : (i) a homopolymer or copolymer of ethylene with a low molecular weight and (ii) a homopolymer or copolymer of ethylene with a high molecular weight, at least 2°C, preferably at least 2.5°C.

14. Applying a combination of nuclearpower agent, preferably talc, and the agent that reduces friction, preferably of buchanania, to obtain a composition bimodal HDPE, including : (i) a homopolymer or copolymer of ethylene with a low molecular weight and (ii) a homopolymer or copolymer of ethylene with a high molecular weight, low coefficient of friction compared to the composition of bimodal HDPE obtained when using only one nuclearpower agent, and compared with the use of only one agent that reduces friction.



 

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SUBSTANCE: invention relates to heat sealable films, laminated materials, membranes or other polymer articles based on cross-linked polymers, having rubber-like heat resistance (heat deformation) and dimensional stability at temperature higher than the melting point of the polymer, while maintaining properties of the compound obtained by heat sealing (heat-adhesive compound). The heat sealable film contains at least one layer formed from a composition containing A) at least one polymer selected from a group comprising i) an ethylene-based polymer, ii) an ethylene/α-olefin/diene interpolymer and iii) a polymer based on a C4-C10 olefin, and B) at least one polymer selected from a group consisting of a propylene/ethylene interpolymer and a propylene/α-olefin interpolymer. Said film is cross-linked using radiation and/or chemical reagents.

EFFECT: polymer films and articles disclosed herein have improved mechanical properties and improved puncture resistance and can be used for high-temperature filling and processing in thermal or radiation sterilisation conditions, and as stretch films and shrink films.

13 cl, 9 dwg, 8 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining cross-linked pipe and to cross-linked pipe, which contains cross-linked polymer composition, containing cross-linked ethylene polymer. method of manufacturing cross-linked pipe includes: (i) polymerisation of ethylene non-obligatorily with one or several comonomers (comonomer) in presence of Ziegler-Natta catalyst with obtaining ethylene polymer, which contains carbon-carbon double bonds; ethylene polymer has: (A) linkability, expressed through the level of gel content, equal, at least, 50 wt %, according to the measurement of disc-shaped sample of cross-linked ethylene polymer (ASTMD 2765-01, Method A, extraction in decalin); or/and (B) content of carbon-carbon double bonds in a number higher than 0.2 carbon-carbon double bond/1000 carbon atoms, according to the measurement by FTIR method; and (ii) obtaining polymer composition, including, at least, 50% wt % of ethylene polymer; (iii) formation of pipe from composition, obtained at stage (ii); (iv) cross-linking pipe, obtained at stage (iii). Ethylene polymer represents ethylene homopolymer or ethylene copolymer with one or several comonomers, and is selected from elastomers (POE), plastomers (OPO) or very low density ethylene copolymers of (VLDPE), which cover the density range from 855 to 909 kg/m3, linear low density ethylene copolymers (LLDPE), which have density in the range from 910 to 930 kg/m3 (ISO 1183), medium density ethylene copolymers (MDPE), which have density in the range from 931 to 945 kg/m3, or high density polyethylenes (HDPE), which are selected from homo- or copolymers of ethylene, and which have density higher than 946 kg/m3. Cross-linked pipe consists of cross-linked polymer composition. Polymer composition before cross-linking includes, at least, 50 wt % of ethylene polymer, where ethylene polymer is obtained by polymerisation of ethylene optionally together with one or several comonomers (comonomer) in presence of Ziegler-Natta catalyst, where ethylene polymer contains carbon-carbon double bonds in a number higher than 0.4 carbon-carbon double bond/1000 carbon atoms, according to the measurement by FTIR method, where ethylene polymer has linkability, expressed through the level of gel content, equal, at least, 50 wt %, according to the measurement for disc-shaped sample of cross-linked ethylene polymer (ASTMD 2765-01, Method A, extraction in decalin) and has MFR2 from 0.01 to 5.0 g/10 min, Mn/Mw from 0.1 to 20.0 g/10 min, and where ethylene polymer represents ethylene homopolymer or ethylene copolymer with one or several copolymers, and is selected from linear low density ethylene copolymers (LLDPE), which have density in the range from 910 to 930 kg/m3 (ISO 1183), medium density ethylene copolymers (MDPE), which have density in the range from 931 to 945 kg/m3, or high density polyethylenes (HDPE), which are selected from ethylene homo- or copolymers and which have density higher than 946 kg/m3.

EFFECT: improvement of material properties.

18 cl, 5 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to crosslinkable compositions based on polyolefins and copolymers thereof and modifiers for producing silanol-crosslinkable polymer compositions which can be used to produce film coatings, insulation and sheaths for cables and conductors for different purposes. The silanol-crosslinkable composition contains polyolefin, vinyl alkoxysilane, organic peroxide and a sheet silicate which is modified with resorcinol resin with ratio of the resorcinol resin to the sheet silicate of 6:10 pts.wt.

EFFECT: improved operational characteristics, shorter crosslinking time and longer property retention time.

6 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a heterophase propylene composition for making articles by injection moulding, as well as a composition for improving strength of polypropylene at low temperatures. The composition contains a polypropylene matrix, an elastomer copolymer containing ethylene links, at least one C3-C20 α-olefin and optionally an unconjugated diene, high-density polyethylene which is bimodal or multimodal polyethylene and inorganic filler.

EFFECT: disclosed heterophase polypropylene has acceptable impact characteristics at -40°C without loss of hardness.

14 cl, 3 tbl, 14 ex

Multimodal polymer // 2496794

FIELD: chemistry.

SUBSTANCE: invention relates to cross-linked polyethylene, a method of producing cross-linked polyethylene, as well as cross-linked polyethylene and articles, preferably pipes, made therefrom. The cross-linked polyethylene contains a multimodal ethylene polymer with density lower than 950 kg/m3, which is obtained via polymerisation in the presence of a catalyst with one active centre and having STR21 from 2 to 15 g/10 min and shear thinning index PSV2.7/210 from 5 to 10.

EFFECT: providing a polymer composition with improved cross-linking capacity, eg with cross-linking degree of at least 70%, flexibility and good processability.

14 cl, 3 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: composition contains a high-molecular weight polyethylene component and a low-molecular weight polyethylene component, and has density of 0.940 g/cm3 or higher and melt strength of 18 cN or higher. The ratio of the weight-average molecular weight of the high-molecular weight component to the weight-average molecular weight of the low-molecular weight component in the composition is greater than 15:1 and less than 28:1, the high- and low-molecular weight polyethylene components being formed by polymerisation in one reactor. The composition is classified as PE 100 material and has the appropriate balance of properties. A tube made from the composition, subjected to an internal strength test, has extrapolated stress of 10 MPa or higher, when the internal strength curve of the tube is extrapolated to 50 or 100 years according to ISO 9080:2003(E).

EFFECT: improved operational characteristics.

22 cl, 3 dwg, 6 tbl

Multimodal polymer // 2491298

FIELD: chemistry.

SUBSTANCE: invention relates to cross-linked multimodal polyethylene. Described is cross-linked polyethylene, which includes multimodal ethylene polymer with density less than 950 kg/m3, obtained by polymerisation in presence of catalyst with one active centre. Polymer has MFR21 from 10 to 20 g/10 min. Index of viscosity reduction in shifting of TVR2.7/210 is at least 4. Also described is application of multimodal ethylene polymer in production of cross-linked pipe and method of multimodal ethylene polymer obtaining.

EFFECT: obtaining good workability and essential cross-linking in one and the same polymer.

15 cl, 3 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to fibre made from a polyethylene composition, a method of making said fibre, fabric made from said fibres and a method of making said fabric. The fibre is made from a polyethylene composition which contains at least 80 wt % of a (co)polymer, which contains at most 100 wt % links obtained from ethylene and less than 20 wt % links of one or more α-olefin comonomers. The composition has density of 0.920-0.970 g/cm3, molecular weight distribution (Mw/Mn) of 1.70-3.5, flow melt index (I2) of 0.2-1000 g/10 min, molecular weight distribution (Mz/Mw) of less than 2.5 and vinyl unsaturation level of less than 0.1 vinyl groups per thousand carbon atoms present in the backbone chain of said composition. The disclosed fibre can have denier value per filament less than 50 g/9000 m, breaking strength of 0.1-15 g/denier and relative elongation less than 1500%.

EFFECT: fabric made from said fibre, both woven and nonwoven, have high tearing strength, improved softness and drapeability.

10 cl, 4 dwg, 10 tbl

FIELD: chemistry.

SUBSTANCE: magnesium lactam-containing complex salt [Mg(C6H11NO)2](C7H6O3)2 is obtained. The method of producing a magnesium lactam-containing complex salt includes reacting a magnesium compound with ε-caprolactam. Magnesium oxide is used and is reacted with ε-caprolactam in molten ε-caprolactam with salicylic acid at 80-150°C for 90-120 minutes with the following molar ratio of components: MgO -1, ε-caprolactam - 2, salicylic acid - 2.

EFFECT: invention increases the rate of structuring rubber mixtures based on fluorinated rubber, reduces viscosity thereof while maintaining basic physical and mechanical properties of vulcanised rubber.

2 cl, 1 dwg, 3 tbl, 3 ex

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