Thermoplastic composition

 

(57) Abstract:

Usage: high-impact termoplastichny composition for the manufacture of structural materials. The inventive thermoplastic composition comprising a grafted copolymer of styrene and block copolymers of styrene and of a conjugated diene and/or a hydrogenated conjugated diene containing up to 30 wt%, styrene, where the grafted copolymer of styrene it contains a copolymer of styrene, consisting of 31-42% wt. polystyrene grafted to polypropylene or static copolymer of propylene and ethylene, or a mixture with the specified blockcopolymers and 6.67-15 wt.% ethylene propylene diene monomer rubber, or 7.5 wt.%, butyl rubber in the following ratio, wt.%: grafted copolymer of styrene 75-92,5, block copolymers of 7.5-25. 2 C. p. F.-ly, 3 tables.

The invention relates to compositions comprising graft copolymers, which include polystyrene grafted to the main chain or the basis of polypropylene, and in particular, this invention relates to compositions based on graft copolymers having a heterogeneous morphology, characterized in that the polypropylene is a continuous phase, and the polystyrene dispersed phase.

Grafted copolymers,interesting class of polymer hybrids, which, though related to the same chemical type, however, exhibit the properties characteristic of the grafted polymer and the core polymer, and not the averaged set of properties of the constituent polymers. When compared with physical mixtures of polymers is that the grafted copolymers, due to their inter-segment chemical bonds, are more subtle heterogeneous phase morphology in which the domain size of the dispersed phase is stable and may be less than an order of magnitude. In addition, the coupling between phases is more durable. Physical mixtures of immiscible polymers, such as polypropylene and polystyrene, require the inclusion of an agent that improves the compatibility, for example, correctly selected block copolymer, which may to some extent reduce the problem associated with high interfacial tension and poor adhesion between immiscible polymers in the mixture. Physical mixture of polypropylene and polystyrene, containing minor amounts of styrene-block-copolymer rubber used as an agent that improves the compatibility of the polymers in the mixture are described in U.S. patent N 4386187.

Engineering plastics, izgotavlivaem to the main chain of polypropylene, meet the requirements in this area, due to the presence of fine structure of a domain from graft copolymers, as well as due to the necessary adhesion between polypropylene and polystyrene, which is a consequence of the formation of chemical bonds in the grafted copolymer, and not the result of an external agent, i.e. the agent that improves compatibility. However, until now, the field of application of such graft copolymers were primarily limited to use as agents that improve the compatibility of immiscible polymer systems and components in the resinous plastic compositions.

In U.S. patent N 3314904 describes the formation of "resinous plastic" by creating a graft copolymer of styrene on polyethylene or polypropylene, in particular graft copolymer of styrene, Acrylonitrile, and polyethylene or polypropylene and the subsequent displacement of the grafted copolymer with certain compatible koutsokoumnis materials. The content of grafted styrene or styrene and Acrylonitrile in the graft copolymer is 75-95%, preferably 85-95%, and more preferably 90-95%, Therefore, the copolymer includes mainly linked styrene or linked tis the capacity component and is present as the dispersed phase. Thus dominated by the properties of the bound styrene or a linked styrene and Acrylonitrile. Grafted copolymer get by ionizing radiation high energy polyolefin, followed by contacting the irradiated polyolefin with styrene or styrene and Acrylonitrile.

However, for use as a separate structural plastics having the desired properties of the polypropylene, such as excellent chemical resistance, good moisture resistance, etc. of the grafted copolymers of the polystyrene main chain of the polypropylene should have a heterogeneous morphology, in which the polypropylene is a continuous phase. This requires that the content of the grafted polystyrene in the copolymer does not exceed 65 weight. and at the same time, was sufficiently high to improve the rigidity of the polypropylene to the necessary extent.

The advantages of grafted copolymers of polystyrene polypropylene based compared with physical mixtures of polymers as a separate structural plastics could be used with greater advantage, if it was found tool that allows you to achieve the best balance of properties of the graft copolymers.

The invention is th:

a) from 60 to 95 weight. the grafted copolymer containing from 10 to 65 weight. polystyrene grafted to the main chain of the polypropylene, and optionally, (b) from 40 to 5 weight. rubber component containing (I) from 20 to 100 weight. (1) at least one block copolymer of aromatic monoalkylated and diene with conjugated double bonds, (II) at least one block copolymer, which is gidrirovanny product (1), or (III) a mixture of at least one block copolymer (1) with one block copolymer (II) and (2) from 80 to 0 weight. olefin-copolymer rubber, such as EPM (ethylene propylene rubber) or EPDM (ethylene-propylene-diene rubber). The term "block copolymer" means the above products (I), (II) or (III), which are discussed further. The composition may include up to 80 parts (all) additives, such as fillers, reinforcing agents, etc. to 100 parts of the graft copolymer and the rubber component.

Additionally, this composition may contain from 5 to 30 hours of polypropylene per 100 hours of grafted copolymer and a rubber component, and acceptable polypropylene materials are materials set forth in this application and which is useful for obtaining privatov avnoj chain of polypropylene grafted copolymer, included in the composition of the present invention, means (a) homopolymers of styrene or alkylthiol having at least one C1-C4alkyl substituent with a linear or branched chain ring, in particular parallellity; (b) copolymers of (a) monomers with any other monomer in all proportions; and (c) copolymers of at least one of (a) monomer with its alpha-methyl derivatives, such as alpha-methylstyrene, in which alpha-methyl derivative is from 1 to 40 weight. copolymer.

It was found that modification of the grafted copolymers of the polystyrene main chain of the polypropylene by mixing with the block copolymer of aromatic monoalkylated and diene with conjugated double bonds can improve the impact strength and the viscosity of the grafted copolymers to unusually high compared with the modification made one olefin-copolymer rubbers. In addition, in the case of rubber modifiers containing block copolymers of aromatic monoalkylated and diene with conjugated double bonds, the modification is made more efficient, then there is a high degree of strength at impact and viscosity mo the greater the degree of hardness of the grafted copolymer.

In accordance with one embodiment of the present invention, the block copolymer consists only of the rubber component. Alternative from 1 to 80 weight. the rubber component is an olefin-copolymer rubber, such as EPM and EPDM, and the rest, that is, from 99 to 20 weight. is the block copolymer of aromatic monoalkylated and diene with conjugated double bonds. In the latter case, it is effective not only the use of a rubber component as compared with the modification produced by EPM or EPDM, but for a given total amount of the rubber component in the composition is achieved a greater increase in the strength of the blow and the viscosity of the grafted copolymer using the block copolymer of aromatic monoalkylated and diene with conjugated double bonds together with EPM or EPDM in comparison with the use of only one block copolymer.

The main component of the composition of the present invention is a grafted copolymer containing from 10 to 65 weight. preferably from 10 to 55 weight. polystyrene grafted to the main chain of the polypropylene, which has a heterogeneous morphology, characterized in that the polypropylene is continuous or Matri is. of the composition. With the grafted copolymer is blended rubber component is from 5 to 40, preferably from 10 to 30 weight. of the composition. Compositions containing less than 5 weight. rubber component, included in the broad scope of the invention.

The rubber component includes at least 20 weight. and preferably 50 weight. the block copolymer of aromatic monoalkylated and diene with conjugated double bonds. This block copolymer is a thermoplastic elastomer having A-B (or double) structure, linear A-B-A (or triple) structure, radial (A-B)na structure in which n is 3-20, or a combination of these structures, in which each A block is a polymer block of an aromatic monoalkylammonium, such as polystyrene and the B block is an unsaturated rubber block, such as polybutadiene or isoprene. A variety of copolymers of this type are produced by the industry. These varieties differ in their structure, molecular weight, middle and end blocks, and the ratio of aromatic monoalkylated to the rubber. In mixtures of two or more block copolymers (one or more copolymers can be gidrirovanie) types of stravagante are styrene, substituted in the ring C1-4alkylthiol with a linear or branched chain and vinyltoluene. Preference is given to styrene. Acceptable danami with conjugated double bonds are butadiene and isoprene.

The average molecular weight of the block copolymer typically ranges from 45,000 to 260000 g/mol, with the preferred average molecular masses in the range of 50,000 to 125,000 g/mol on the basis that they provide the composition with the best balance of strength at impact and stiffness. Although it is possible to use block copolymers having unsaturated and saturated rubber blocks, preference is given to copolymers with saturated rubber blocks taking into account the balance of strength at impact and hardness of the compositions containing them. The weight ratio of aromatic monoalkylated and diene rubber with conjugated double bonds in the block copolymer typically ranges from 5/95 to 50/50, preferably from 10/90 to 40/60.

The examples below show that significant improvement of strength at impact and the viscosity of the copolymers of polystyrene grafted to the polypropylene by mixing with them 100% of the block copolymer rubber. Rubber component, spoofee, that at least 20% and preferably 50% of the component is one block copolymer of aromatic monoalkylated and diene with conjugated double bonds. Especially preferred rubber component is a component containing from 20 to 70% preferably from 50 to 70% of a block copolymer of aromatic monoalkylated and diene with conjugated double bonds and from 80 to 30%, preferably from 50 to 30% olefin-copolymer rubber (EPM or EPDM. In the composition of the invention can be used a rubber component comprising a block copolymer, and instead olefin-copolymer rubber, butyl rubber or static copolymer of butadiene and styrene (SBR).

Ethylene-propylene rubber used in the preferred compositions of the present invention is an elastomer with a weight ratio of ethylene to propylene in the range of from 25/75 to 75/25, preferably from 40/60 to 60/40, and a characteristic viscosity in the range from 2.0 to 6.0, preferably from 2.5 to 4.0 DL/g

Polypropylene material that forms the main chain or grafted copolymer is (a) a homopolymer of propylene; (b) static copolymer of propylene and olefin selected from the group, in limeishere the amount of ethylene is about 10 (preferably 4) weight. and if the olefin is a C4-C10I-olefin, the maximum polymerized quantity is about 20 (preferably 16) weight. (c) static terpolymer propylene and olefin selected from the group including ethylene and C4-C8I-olefins, provided that the maximum polymerized amount of C4-C8I-olefin is about 20 (preferably 16) weight. and if one of the olefin is ethylene, the maximum polymerized amount of ethylene is about 5 (preferably 4) weight. or (a) a homopolymer or static copolymer (b) propylene, which modified impact strength using the ethylene-propylene rubber in the reactor or by physical mixing, the content of the ethylene-propylene rubber modified polymer is from 5 to 30% and the ethylene content in rubber is from 7 to 70%, preferably from 10 to 40% C4-C10I-olefins include C4-C10I-olefins from linear and branched chain such as 1-butene, 1-penten, 3-methyl-1-butene, 4-methyl-1-penten, 1-hexene, 3, 4-dimethyl-1-butene, 1-hepten, 3-methyl-1-hexene and the like compounds. Preferred polypropylene materials are polypropyleneimine aspects of the present invention can also be used polypropylene and static copolymers, whose impact strength modified with ethylene-propylene-diene rubber containing diene about 2-8% although they are not preferred components. Acceptable dieny are Dicyclopentadiene, 1,6-hexadiene, ethylidenenorbornene.

As mentioned above, the polymer grafted to the main chain of the polypropylene, grafted copolymer included in the composition of the present invention is polystyrene. Polystyrene, which is part of the grafted copolymer is from 10 to 65 weight. is preferably from 10 to 55 weight. and preferably equal to 25-50 weight. the grafted copolymer. As a result, the morphology of the grafted copolymer characterized in that the polypropylene is continuous or matrix phase, and the polystyrene dispersed phase.

Grafted copolymer, which is the main component of the composition of the present invention, can be obtained in accordance with any of the known methods. One of these methods involves the formation of active centers vaccinations in polypropylene or in the presence of grafted monomer, or with the subsequent processing of this monomer. Centers vaccinations can be formed by treatment with a peroxide or other chemical is their high energy radiation. Free radicals formed in the polymer by chemical treatment or irradiation, to form active centers in the polymer and initiate polymerization of the monomer in these centres. Preferred grafted to the copolymer obtained by the method of grafting initiated by peroxide.

In the exercise initiated by the peroxide method, the polypropylene is treated at a temperature of from 60 to 125oC, preferably from 80o120oC, the polymerization initiator in an amount of from 0.1 to 6, preferably from 0.2 to 3.0 hours per hundred (weight parts per 100 weight parts of polypropylene material), and whose half-life is equal to 1 to 240, preferably 5-100 and preferably 10-40 min at the temperature. A preferred class of initiators is organic peroxides, and particularly those who form the CNS radicals. These peroxides include acyl peroxide such as benzoyl peroxide and Dibenzoyl; dialkyl peroxide and aralkyl, such as peroxide di-tert-butyl, peroxide Dicumyl, the peroxide has been studied butyl, 1,1-di-tert-BUTYLPEROXY-3,5,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di-tert-butylperoxide and bis (alpha-tert-butylperoxyisopropyl); peroxyl(di/perftest), tert-butyl peroxy-2-ethylhexanoate and 1,1-dimethyl-3-hydroxybutyrate-2-ethylhexanoate and percarbonate, such as di(2-ethylhexyl)percarbonate, di(n-propyl)-percarbonate and di(4-tert-butylcyclohexyl)percarbonate.

During the time period that coincides with or follows the treatment period is initiated, and these periods may be imposed on each other or not, polypropylene material is treated with 10-70 weight. grafted monomer (monomers) calculated on the total weight of polypropylene material and grafted monomer (monomers) at a speed of add, which is not greater than 4.5, preferably about 4.0 to 3.0 and preferably including one hundred in minutes at any level of addition of the monomer. If the monomer is added after the period of introduction of the initiator, it is preferable not later than 2.5 half-life of the initiator.

At the end of the vaccination period unreacted monomer is removed from the resulting grafted polypropylene material, unreacted initiator decomposes and residual free radicals are deactivated, preferably by heating at a temperature equal to at least 110oC, for about 5 min, preferably at a temperature of 120

In the case of the implementation of the method in which the active centers vaccinations are formed by irradiation of polypropylene material is irradiated at a temperature of from 10oup to 85oC using a source of ionizing radiation, high energy, and then irradiated polymeric material is treated at a temperature of from 10oup to 70oC and preferably from 10o50oC for about 3 minutes, preferably for 10 minutes during semi-continuous process and preferably within 30-60 min during continuous process 10-70 weight percent of grafted monomer (monomers) in terms of the total weight of the polypropylene material and grafted monomer (monomers). After that, simultaneously or sequentially in any order any residual free radicals in the resulting grafted polypropylene material inactivate and unreacted monomer are removed from this material. Polypropylene material is in conditions that do not cause oxidation, for example in an atmosphere of inert gas throughout the entire process until the end of the decontamination of residual free radicals. The deactivation of free radicals preferably produced by heating, for example the>Preferred grafted copolymer designed for use in the compositions of the present invention, has the form of a uniformly grafted particles formed from particles of polypropylene, in which (a) the proportion of the pore volume is at least of 0.07, preferably 0.12 and preferably of 0.20, with more than 40% of the pores, preferably more than 50% of the pores and preferably more than 90% of the pores have a diameter greater than 1 micron; (b) a surface area equal to at least 0.1 m2/g; (c) weighted average diameter is in the range from 0.4 to 7 mm

The preferred composition of the present invention, in which the rubber component contains a block copolymer of aromatic monoalkylated and diene with conjugated double bonds and ethylene-propylene rubber may be a physical mixture of two rubber ingredients with the grafted copolymer. If this composition is a mixture of a block copolymer of aromatic monoalkylated and diene with conjugated double bonds with the grafted copolymer in which polystyrene was grafted to the polypropylene or static copolymer, impact strength which modified ethylene-propylene rubber, spoleczenstwo EPM in the composition is a component of the graft copolymer.

The composition of the present invention may include fillers and reinforcing agents, for example, black carbon and fiberglass, as well as inorganic powders such as calcium carbonate, talc, mica and glass, in an amount up to 80 weight parts per 100 weight parts of the grafted copolymer and the rubber component. In addition to the economic effect achieved by such fillers, they increase the hardness and temperature of thermal deformation.

The components of this composition can be mixed or admixed in any known mixing device, such as an extruder or mixer Bunbury.

In the following examples, shown in the illustrated order, describes the different ways the compositions of the present invention based on the graft copolymer.

All of the examples and control experiments grafted copolymer and a block copolymer of aromatic monoalkylated and diene with conjugated double bonds, as well as any other used the modifier was mixed and extrudible as a result of one or two passages through a twin-screw extruder of Brabender (example 15 and reference example 7); mixed in the mixer Bunbury and actively in Bunbury mixer and extrudible one passing through the twin screw extruder of Brabender (examples 1,2, 4-12 and 14 and reference examples 1-6). With the aim to minimise oxidation in all batches before mixing was added to a stabilizing composition (0.2 wt.), known as P-EPQ, the main component of which is tetrakis (2,4-decret-butylphenyl)-4,4'-biphenylenediisocyanate. The temperature in the extruder was equal 200-245oC, with the exception of the melt, where it was 250-265oC. From ekstrudirovannyh mixtures were molded samples for testing (standard samples for testing for tensile strength, standard samples for testing bending and plate size 0,32x7,6x7,6 cm).

For testing molded samples used method D-256 of the American society for testing materials (impact strength Izod), D-638 (tensile strength, D-638 (tensile elongation at break), D-790 (modulus of elasticity in bending), and ASTM-648 (the onset temperature of thermal deformation due to the pressure 1820 kPa).

Examples 1-6.

Received six compositions of the present invention, which were tested as described below. In these compositions, the block copolymer was a block copolymer of styrene (SBC). I received six of the control compositions not containing the block copolymer of aromatic monoalkenes consisted of a copolymer of polystyrene, grafted to the main chain of polypropylene, which was obtained as described above graft copolymer with the initiation of the reaction with peroxide, in the exercise of which a solution of tert-butyl peroxy-2-ethylhexanoate (PROXIFIER) in white-spirit, not containing oxygen was injected into the heated polypropylene (100oC) and after a short extracts was injected styrene. To obtain graft copolymers (a) of examples 1 and 6 and reference examples 1 and 2 used the following criteria vaccinations: 1 o'clock one hundred PROXIFIER kept for 15 min, was added 54 PM on hundred of styrene with speed 1,64 including one hundred/min, kept for 3 hours at a temperature of 100oC, then 4 hours at a temperature of 135oC when performing purging with nitrogen for the purpose of decontamination and drying; (b) to obtain grafted copolymers in examples 2.4 and 5 and reference examples 3-6 were using the same conditions described in paragraph (a), except that 2,35 including one hundred PROXIFIER was kept for 10 min and added 84,4 including one hundred styrene at a rate of 2.4 hours for a hundred/min; and for the graft copolymer (c) according to example 3 used the same conditions described in paragraph (b), except h is blowing with nitrogen. All values PROXIFIER listed in parts per hundred per active components.

The polypropylene used for the graft copolymer, was finely crushed porous polypropylene (LBD 406 A, produced on a commercial basis by the firm "Himont Italia S. r.e.") in the form of spherical particles having the following characteristics: nominal melt viscosity (method D 1238-82 American society for testing materials, mode L/8 DG/min; characteristic viscosity (method j. G. Elliott and others, J. Applied Polymer Sei. 14, 2947-2963, 1970) a polymer soluble in decahydronaphthalene at a temperature of 135oC/of 2.4 DL/g; surface area (B. E. T.) 0.34 m2/g; the weight-average diameter of 2.0 mm; and the percentage of pore volume (method mercury porometry) of 0.33. More than 90% of the pores in the porous particles had a diameter of more than 1 micron.

The results of the tests performed on the compositions according to examples 1-6 and six control compositions shown in table. 1.

Examples 7-14.

The compositions of these examples were obtained in accordance with the method and when using the ingredients described in example 1, except that in these examples, the rubber component consisted of two ingredients. For poluchka: 1 o'clock one hundred PROXIFIER kept for 10-15 minutes, was added 54 PM on hundred of styrene with a speed of 1.6-1.8 hours for a hundred/min, kept for 3 hours at a temperature of 100oC, and then 4 hours at a temperature of 135oC (except temperature 100oC, example 12 and reference example 7) in carrying out purge with nitrogen for the purpose of decontamination and drying; (b) grafted copolymers according to examples 8 to 10 and 13 were obtained as described in paragraph (a), except that 2,35 including one hundred PROXIFIER was kept for 10 min and added 84,4 including one hundred styrene at a rate of 2.4 hours for a hundred/min and (c) graft copolymer according to example 14 was obtained in the same way as described in paragraph (b), except what 0,79 including one hundred PROXIFIER was stirred for 2 hours at a temperature of 104oC after the addition of styrene and before purging with nitrogen.

The results of the tests performed on these compositions and a control composition not containing the block copolymer of aromatic monoalkylated and diene with conjugated double bonds, are summarized in table. 2.

Example 15.

Applied the method and ingredients described in example 1, except that polypropylene was statistical different radicals, educated in static copolymer irradiated by an ionizing radiation source of high energy, which was described above. The dose was equal to 4 Mrad, and in the radiation chamber was maintained at room temperature (approximately 23oC). Two minutes after the end of irradiation in the irradiated copolymer at room temperature (23oC was injected 147 hours at one hundred and styrene at a speed of 23 hundred hours/minutes for 6,5 minutes styrene and irradiated copolymer was stirred at this temperature for 30 minutes After the temperature in the reactor was increased to 140oC and kept stirring for another 30 min to deactivate the residual free radicals. The excess monomer was removed by purging with nitrogen. In the radiation chamber and reactor for the production of grafted copolymer has maintained an atmosphere of nitrogen (oxygen level below 0,004 volume ). The degree of grafting (polystyrene) of the obtained graft copolymer was 44 hours for a hundred.

The resulting composition had the following properties:

Impact strength Izod at a temperature of 23oC 2.8 lb/power-ft/ inch (150 j/m)

The modulus of elasticity in bending (1% secant) 110, 700 psig (763 MPa)

P the>Examples 16-17.

Applied the method and ingredients described in examples 1 (example 16) and 7 (example 17), except that in the process of obtaining graft copolymer of a mixture of styrene and alpha-methylstyrene was injected in polypropylene. The grafted copolymer was obtained under the following conditions: 1,57 including one hundred PROXIFIER was kept for 10 min, was added 76 o'clock one hundred styrene and 8.4 hours at one hundred and alpha-methylstyrene at a rate of 2.4 hours for a hundred/min, kept for 3 hours at a temperature of 102oC, then 4 hours at a temperature of 133oC perform purging with nitrogen.

The degree of grafting (a copolymer of styrene and alpha-methylstyrene) in the grafted copolymer was 45%, the Ratio of styrene and alpha-methylstyrene in the grafted copolymer was 9/1. The results are shown in table. 3.

From the above description, the specialist should be understood other features, advantages and embodiments of the present invention. In this regard, it should be noted that, although details were considered only certain embodiments of this invention, these options may be various changes and modifications without going beyond the nature and scope of this invention.

frame of diene and/or a hydrogenated conjugated diene, containing up to 30 wt. styrene, characterized in that it comprises a graft copolymer of styrene grafted copolymer of styrene, comprising 31 42 wt. polystyrene grafted to polypropylene or a statistical copolymer of propylene and ethylene containing 3.6 wt. ethylene, or a mixture with the specified blockcopolymers styrene and 6.67 15 wt. ethylene propylene diene monomer rubber, or 7.5 wt. butyl rubber in the following ratio, wt.

Grafted copolymer of styrene 75 92,5

Block copolymers of 7.5 25

2. The composition according to p. 1, characterized in that the grafted copolymer of styrene it contains a grafted copolymer of styrene and a-methylstyrene.

3. The composition according to p. 1, characterized in that the grafted copolymer obtained by radical polymerization of styrene onto polypropylene in the presence of a peroxide initiator.

 

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14 cl, 7 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: composition contains from 30 wt % to less than 50 wt % propylene-alpha-olefin copolymer and from more than 50 wt % to 70 wt % styrene block-copolymer. The propylene-alpha-olefin copolymer has at least 70 wt % links formed from propylene, and from 10 to 25 wt % links formed from C2- or C4-C10-alpha-olefin and has heat of fusion less than 37 J/g and melt flow index from 0.1 to 100 g/10 min. The composition has modulus of elasticity in tension less than 20 MPa, ultimate tensile stress of at least 5 MPa and elongation at failure of at least 900% and low relative instantaneous shrinkage.

EFFECT: composition has good physical properties such as elasticity and flexibility, and can also be easily processed using traditional equipment for processing polyolefins.

21 cl, 8 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of producing granular foamed compositions based on vinyl aromatic compounds and can be used in making articles from foam plastic. The foamed composition contains a polymer matrix selected from a copolymer containing 90-99.995 wt % of at least one vinyl aromatic monomer and 0.005-10 wt % salt or C1-C4 alkyl ether of styrenesulphonic acid; or a polymer mixture containing 92-99.995 wt % vinyl aromatic (co)polymer and 0.005-8 wt % of a product selected from a salt or C1-C4 alkyl ether of styrenesulphonic acid and a copolymer of styrene and a salt or C1-C4 alkyl ether of styrenesulphonic acid; 1-10 wt % with respect to weight of the polymer matrix of the foamed additive selected from aliphatic or cycloaliphatic hydrocarbons containing 3-6 carbon atoms, or mixtures thereof, halogenated derivatives of aliphatic hydrocarbons containing 1-3 carbon atoms, and carbon dioxide. Foamed beads, foamed articles and methods of producing granular foamed compositions in an aqueous suspension or in a mass are also described.

EFFECT: obtaining foamed granules having low density and low electrostatic charge.

9 cl, 9 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a polymer composition which is used to make sterilisable containers, for example, sterilisable bags or medical packaging for intravenous solutions, for example. The composition contains a heterophase propylene copolymer and styrene-based elastomer(s), wherein the ratio of the flow rate MFR2 (230°C) of the heterophase propylene copolymer to the flow rate MFR2 (230°C) of the styrene-based elastomer (MFR2 (230°C) (A)/MFR2 (230°C)(B))≤1.0. The heterophase copolymer contains a polypropylene matrix and an elastomeric propylene copolymer which contains at least one comonomer selected from a group comprising ethylene and C4-C20 alpha-olefins. The weight content of styrene in each styrene-based elastomer is equal to less than 15%, and the total weight content of styrene-based elastomers (B) from the total amount of polymers in the polymer composition ranges from 16.0 to 46.0%. The polymer composition disclosed herein is particularly suitable for making heat-sealable films.

EFFECT: polymer composition provides high air-tightness of articles made therefrom after sterilisation while maintaining high strength and dullness.

22 cl, 3 tbl

FIELD: chemistry.

SUBSTANCE: composition contains at least one latex polymer, at least one pigment, water and at least one auxiliary additive. The auxiliary additive is ethoxylated tristyrenephenol and is present in an amount higher than about 1.3 wt % with respect to the weight of the polymer.

EFFECT: improved freeze-thaw stability, as well as other properties such as film setting time, colour stability, low film-formation temperature, film-forming resistance, blocking resistance, adhesion and sensitivity to water.

12 cl, 1 dwg, 24 tbl, 10 ex

FIELD: polymer materials.

SUBSTANCE: composition comprises polyolefin A, containing anhydride function and having viscosity at least 20 g/10 min measured at 190°C and loading 2,16 kg, and epoxy function-containing product B destined for cross-linking polyolefin A. Relative proportions of A and B are such that for each epoxy function there are from 0.1 to 1.5 anhydride functions. Composition can be used in slush molding process, in thermal molding of sheets, or in on-rod casting process.

EFFECT: increased flowability resistance and wear resistance.

6 cl, 1 tbl, 6 ex

FIELD: polymers, in particular composition for molded articles useful in building materials.

SUBSTANCE: claimed composition contains (A) 100 mass pts of vinyl chloride-based resin; (B) from 1 to 30 mass pts of graft copolymer obtained by graft polymerization; (C) from 0.1 to 5 mass pts of methylmethacrylate-based polymer obtained by two-step method in presence of polymer, wherein 0.1 g of said polymer in 100 ml of chloroform has intrinsic viscosity (ηsp) at 30°C of 0.7 or more and contains 0-50 mass % of methylmethacrylate repeated units, and 0.1 g of in two step obtained polymer in 100 ml of chloroform has intrinsic viscosity (ηsp) at 30°C of 0.5 or more; and (D) from 1 to 20 mass pts of calcium carbonate.

EFFECT: articles with high processibility, whether resistance, impact resistance and luster.

5 cl, 19 ex, 3 tbl

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