Copolymers of ethene and and (C08L23/08)

Refractory polymer composition // 2640769
FIELD: chemistry.SUBSTANCE: invention relates to the refractory polymer composition suitable for use when applying the coating on the treated articles containing thermoplastic polymer containing vinyl acetate, and an unsaturated elastomer containing double bonds as polymeric components, where the polymer components are present in the form of a homogeneous polymer blend, and where a composite matrix is formed, vulcanized only with the use of sulfur or a crosslinking system containing sulfur, where the sulfur crosslinking system is distributed throughout the matrix and fully penetrates into the matrix, and at least one flame retardant or a combination of flame retardants. The invention further relates to articles obtained from such a composition and to composite elements coated with the composition as well as to the method for their preparation.EFFECT: producing compositions for protecting a dynamically tense component with a coating of this composition, so that the aggregate component is sufficiently refractory, in particular, complies with the standard for fire safety CEN TS 45545-2 without rendering noticeable adverse effects by the specified coating on the dynamic properties of the composite element during its service life.38 cl, 16 dwg, 5 tbl, 5 ex

Polymeric composition for blow moulding // 2640594
FIELD: packaging industry.SUBSTANCE: composition contains from 45 to 55% by weight of an ethylene polymer (A) having a density of at least 968 kg/m3, and 55 to 45% by weight of an ethylene polymer (B) having a density of from 920 to 955 kg/m3. In addition, the composition has a density of between 952 and 961 kg/m3, a melt index at an increased shear strain HLMI of 18-28 g/10 min, an HLMI/MI2 ratio equal to 80-150, and a modulus of elasticity of the melt G'(G"=3000) of 1200-1600 Pa. In this case, HLMI and MI2 are measured in accordance with ISO1133 at a temperature of 190°C, with loads equal to 21.6 kg and 2.16 kg respectively.EFFECT: good workability balance, high stiffness and good mechanical characteristics, especially resistance to environmental stress cracking and to impact.14 cl, 1 dwg, 3 tbl

Polymers based on ethylene and products produced from them // 2638261
FIELD: chemistry.SUBSTANCE: polymer containing from 80.0 to 99.0 wt % of polymer links formed from ethylene and 1.0 to 20.0 wt % of polymer layers, formed from one or more C3-C20-α-olefin comonomers, is suitable for the production of films in the process of forming a tubular film when the degree of the bulge (BUR) of 3.0 to 8.0, and the ratio for the length of the neck (NHR) of 2.0 to 12.0. In addition, the ethylene-based polymer has a local maximum of the loss angle for the complex modulus, G*, equal to 2.50×104 up to 1.00×106Pa, and the local minimum of the loss angle with the complex modulus, G*, equal to 1.00×104 up to 3.00×104 Pa.EFFECT: films have excellent shrinkage and tear characteristics.22 cl, 2 dwg, 4 tbl, 33 ex
Plastic polymer composition for children's creativity // 2637711
FIELD: chemistry.SUBSTANCE: invention can be used to obtain products - crafts of children's creativity, as well as in industrial design. Plastic polymer composition for children's creativity includes, wt %: isoprene rubber 13.0-25.0, copolymer of ethylene with vinyl acetate, - 1.5-2.8, paraffin 32.0-40.0, mineral oil as an emollient 5.5-8.0, a filler 32.0-40.0 and, if necessary, dye 0-0.2.EFFECT: invention allows to obtain biologically inert non-toxic plastic composition having elastomeric properties and high term preservation of the plastic properties.1 tbl
Composition of propylene resin // 2636316
FIELD: chemistry.SUBSTANCE: composition contains a random copolymer of propylene and ethylene (A), in which the ethylene content is 2-9 mol. %, the ethylene copolymer and α-olefin (B) produced by copolymerization of ethylene with one or more αolefins having 3-10 carbon atoms, a fibrous filler (C) having an average fibre length of 0.1 to 2 mm and an average fibre diameter of 1-25 microns, lubricant (D) and polypropylene modified with unsaturated carboxylic acids or their derivatives (E). The random copolymer of propylene and ethylene (A) has a melt flow rate (ASTM D1238, 230 °C, under load 2.16 kg) of 5 to 100 g/10 min, and a copolymer of ethylene and α-olefin (B) has a melt flow rate (ASTM D1238, 230 °C, under load 2.16 kg) of 0.1 to 80 g/10 min.EFFECT: resistance to surface damage, excellent mechanical properties.10 cl, 4 dwg, 2 tbl, 18 ex
Polyethylene composition // 2632204
FIELD: chemistry.SUBSTANCE: composition contains from 40 to 55 wt % of the fraction (A) of ethylene copolymer and from 0.3 to 1 mol % C4-C10 of alpha-olefin with melt index MI2 (2.16 kg, 190°C) from 320 to 500 g/10 min and a density of 963 to 973 kg/m3 and from 45 to 60 wt % of the fraction (B) of ethylene copolymer and from 0.3 to 1 mol % C4-C10 of alpha-olefin. And the density of the composition in the unpainted state is from 940 to 956 kg/m3, melt index MI5 (5 kg, 190°C) from 0.1 to 1 g/10 min and a viscosity at high shear stress η210kPa from 2 to 6 kPa⋅s. In addition, the composition has a homogeneous or inverse distribution of the comonomer in both fractions (A) and (B).EFFECT: composition of the invention has a good balance of strength, flexibility and workability.10 dwg,1 tbl, 3 ex
Polymer composition for producing biodegradated articles // 2629680
FIELD: chemistry.SUBSTANCE: invention relates to the production of polymer compositions containing polyethylene and biodegradable filler used in the manufacture of packaging thermoformed articles and films capable of biodegradation under the influence of climatic factors and microorganisms with high operational and technological characteristics. The polymer composition for the manufacture of biodegradable articles contains a biodegradable filler - beet pulp, a technological additive - polyethylene glycol, ethylene vinyl acetate copolymer, a mixture of low and high pressure polyethylenes in a ratio of 1:1 for the given ratio of components.EFFECT: invention allows, with the same content of biodegradable filler, providing a high biodegradability, to significantly improve operational and technological characteristics.1 tbl
Polyethylene composition with high degree of swelling // 2621807
FIELD: textiles, paper.SUBSTANCE: polyethylene composition for shaped articles is disclosed and has the following characteristics: 1) density from 0.945 to 0.952 g/cm3, preferably from 0.948 to 0.951 g/cm3, as determined in accordance with ISO 1183 at 23°C; 2) the ratio MIF/MIP 15 to 30, in particular from 17 to 29, wherein MIF - melt flow index is at 190°C with a load of 21.60 kg, a MIP - is the melt flow index at 190°C with a load of 5 kg, both determined according to ISO 1133; 3) SIC index from 2.5 to 5.5, preferably from 2.5 to 4.5, and more preferably from 3.2 to 3.9; wherein SIC index - a crystallisation index of shear determined by the following relation: index SIC = (tstarted, SIC at 1000×tstarted, motionless)/(100×HLMI), where tstarted, SIC at 1000 is measured in seconds and is the time required for onset of crystallization at a shear rate of 1000 sec-1, tstarted, motionless is measured in seconds and is the time at the onset of crystallization temperature of 125°C in the absence of any changes, determined under isothermal conditions by differential scanning calorimetry; HLMI - is the melt flow index, measured at 190°C with a load of 21.6 kg in accordance with ISO 1133. Polyethylene composition, blow molded product, is also disclosed, as well as the process of preparing the polyethylene composition.EFFECT: obtained resin composition with high toughness, reduced flow instability and reduced shrinkage.10 cl, 1 tbl, 2 ex

Polyethylene composition with high mechanical properties // 2621045
FIELD: chemistry.SUBSTANCE: composition has a density of 0.945 to 0.955 g/cm3, MIF/MIP ratio of 30 to 45, crystallization index at SIC shift of 1.0 to 2.5 and a long chain branching index equal to or greater than 0.85. Moreover, the composition include an ethylene (co)polymer (A) with a density less than 0.960 g/cm3 and MIE melt flow index of 50-200 g/10 min and an ethylene copolymer (B) with lower MIE values, compared to the MIE value of (A), preferably below 0.5 g/10 min. At that, content of comonomer, which is selected from olefins having the formula CH2=CHR, where R is an alkyl radical, linear or branched, containing from 1 to 10 carbon atoms, is from 1 to 3 wt % relative to the total weight of the composition.EFFECT: composition has a good balance of physical and mechanical properties and improved resistance to cracking under environmental stress and toughness.7 cl, 1 dwg, 1 tbl, 5 ex
Improved resin compositions for coatings applied by extrusion // 2619127
FIELD: chemistry.SUBSTANCE: composition comprises 50 to 90 wt % of the first polyethylene component, 1 to 10 wt % of the second polyethylene component and 10 to 50 wt % of the third polyethylene component. Moreover, the first polyethylene component in the composition includes low density linear polyethylene with density ranging from 0.90 g/cm3 to 0.96 g/cm3 and melt index (I2) from 5 to 15 g/10 min, the second polyethylene component includes high-pressure low density polyethylene with density ranging from 0.915 g/cm3 to 0.930 g/cm3 and melt index (I2) from 0.1 g/10 min to 3 g/10 min and the third polyethylene component includes high-pressure low-density polyethylene with density ranging from 0.915 to 0.930 g/cm3and melt index (I2) from 5 to 15 g/10 minutes.EFFECT: composition according to the invention exhibits low restriction and superior resistance to stretching.17 cl, 3 tbl, 4 ex

Polymer composition for electric devices // 2614138
FIELD: manufacturing technology.SUBSTANCE: invention relates to a cable, including a cross-linked cable, also to a method for production of a cable, more preferably, to production of a power cable. Cable includes a conductor enveloped by one or more layers, wherein at least one of the above said layers is made from a polymer composition, which contains polyolefin and an anion-exchange additive of hydrotalcite type in the amount from 0.000001 to less than 1 wt% with respect to the total weight of the polymer composition. Herewith polyolefin is an unsaturated polymer of ethylene of low density, which is selected from an unsaturated ethylene homopolymer of low density or an unsaturated ethylene copolymer of low density and one or more comonomers in an amount of at least 50 wt% with respect to the total weight of the polymer component(s) present in the polymer composition. Besides, the polymer composition, if necessary, additionally contains peroxide in the amount of less than 35 mmol -O-O-/kg of the polymer composition. Herewith the cable, probably, is ligated and then cross-linked.EFFECT: obtained cable has low conductivity and good mechanical properties.17 cl, 1 dwg, 2 tbl

Polymer composition for electric devices // 2613330
FIELD: electricity.SUBSTANCE: invention relates to a power cable of direct current, which contains a polymer composition and, probably, is cross-linkable and then cross-linked, as well as a method of producing a DC power cable, including a high-voltage DC power cable. DC power cable comprises a conductor enveloped by an inner semiconducting layer, an insulating layer and an outer semiconducting layer in the specified order. Herewith at least the insulating layer contains a polymer composition, which contains an ethylene polymer and an inorganic ion-exchange additive of hydrotalcite type in the amount of 0.000001–0.7 wt% with respect to the total weight of the polymer composition.EFFECT: obtained cable has low conductivity and good mechanical properties.10 cl, 2 dwg, 2 tbl, 4 ex

ethods for production of polyethylene and compositions thereof // 2612250
FIELD: chemistry; manufacturing technology.SUBSTANCE: invention relates to compositions for production of polyethylene for moulding by extrusion, casting and blowing hollow articles and to a method for production thereof. Composition contains first polyethylene and second polyethylene, produced in any order in presence of a Ziegler-Natta catalyst in series-connected gas-phase reactors. At least one of first or second gas-phase reactors comprises first and second polymerisation zones, in which hydrogen pressure in first and second polymerisation zones differs so at least part of ethylene from second cycle, through first and second polymerisation zones, and gas mixture from each polymerisation zone partially or completely does not enter another zone. First polyethylene and/or second polyethylene additionally contains one or more comonomers in amount of 0.05–1.2 wt% with respect to total weight of composition and selected from olefins with formula CH2=CHR, where R is an alkyl or substituted alkyl containing 1 to 12 carbon atoms.EFFECT: obtained polyethylene compositions have such balanced properties as manufacturability, high degree of swelling of extruded melt with high surface quality, stability of dimensions, possibility of moulding from melt at high values of shear rate, as well as environmental stress cracking resistance (ESCR).15 cl, 1 dwg, 3 tbl, 2 ex
ethod // 2609029
FIELD: pipes.SUBSTANCE: invention relates to a polyethylene mixture of high density intended for making articles, preferably, such as pipes. Polyethylene mixture has the melt flow index (MFI21) of not more than 10.0 g/10 min defined according to ISO 1133 at 190 °C and the load of 21.6 kg and the density of at least 940 kg/m3. Herewith the mixture contains from 55 to 95 wt% of a high-density multimodal polyethylene copolymer with the density of at least 940 kg/m3 and from 5 to 45 wt% of an ethylene homopolymer of ultrahigh molecular weight, which has the characteristic viscosity of at least 6 dl/g and the MFI21 less than 0.5 g/10 min.EFFECT: obtained polymer mixture has higher sag resistance and impact strength without deterioration of its mechanical properties in tension.17 cl, 3 dwg, 3 tbl, 9 ex

Polyethylene composition with high degree of swelling // 2607625
FIELD: chemistry.SUBSTANCE: invention relates to a polyethylene composition for making moulded articles of different types. Composition has density from 0.953 to 0.960 g/cm3 and ratio of MIF/MIP from 17–29, where MIF is melt flow index at 190 °C with load of 21.60 kg, and MIP is melt flow index at 190 °C with a load of 5 kg. Composition is obtained by polymerisation of ethylene, optionally together with one or more comonomers, in a gas phase reactor in presence of hydrogen and copolymerisation of ethylene with one or more comonomers in other gas-phase reactor in presence of a lower amount of hydrogen, than at step a). In at least one of said gas-phase reactors growing polymer particles flow upward through a first polymerisation zone under fast fluidisation or transfer conditions, come out of said zone, and enter a second polymerisation zone, through which they flow down by gravity, come out of said second polymerisation zone and reenter first polymerisation zone, creating circulation of polymer between polymerisation zones. All copolymerisation steps are carried out in presence of a Ziegler-Natta polymerisation catalyst deposited on MgCl2. Polyethylene composition contains one or more copolymers of ethylene and not more than 1 wt% of comonomer, selected from olefins of formula CH2=CHR, where R is alkyl radical, linear or branched, containing from 1 to 10 carbon atoms.EFFECT: obtained composition is characterised by good balance of physical and mechanical properties, high degree of swelling of extruded flow with surface of high quality and stability of dimensions of end product, environmental stress-cracking resistance (FNCT) and impact strength.4 cl, 1 dwg, 1 tbl

Aqueous pour point depressant dispersion composition // 2606626
FIELD: oil industry.SUBSTANCE: invention relates to an aqueous pour point depressant dispersion composition for improving fluidity of crude oil at low temperatures. Composition contains an ethylene vinyl acetate copolymer, a dispersing agent, water and optionally an aqueous pour point depressant.EFFECT: obtained pour point depressant lowers setting point of crude oil, exists in liquid state in a wide temperature range and demonstrates long-term resistance to creaming.11 cl, 1 dwg, 3 tbl, 10 ex

ethod for preparing aqueous pour point depressant dispersion composition // 2606625
FIELD: oil and gas industry.SUBSTANCE: invention relates to method of preparing an aqueous pour point depressant dispersion composition for improving fluidity of crude oil at low temperatures. Method comprises steps of combining in an extruder ethylene vinyl acetate copolymer, a dispersing agent and water to form an aqueous dispersion of ethylene vinyl acetate copolymer which optionally can be mixed with an aqueous freezing point depressant.EFFECT: obtained pour point depressant reduces pour point of crude oil, exists in liquid state in a wide temperature range and demonstrates long-term resistance to creaming.10 cl, 1 dwg, 3 tbl, 10 ex

Surface covering // 2602900
FIELD: materials.SUBSTANCE: invention relates to a PVC-free multiple layer surface covering, comprising at least one layer of a thermoplastic composition, wherein the thermoplastic composition comprising a polymer-based matrix representing 100 parts in weight and comprising one or more olefin-based polymer(s) and one or more anhydride copolymer(s), said one or more anhydride copolymer(s) representing between 5 and 40 parts in weight of the polymer-based matrix, one or more filler(s) representing in weight at least 100 parts per 100 parts of said polymer-based matrix, one or more basic or amphoteric metal oxide(s) representing between 5 and 40 parts in weight per 100 parts of said polymer-based matrix.EFFECT: technical result is providing multiple layer surface covering having improved residual indentation.9 cl, 8 tbl, 31 ex

Polyethylene composition with high mechanical properties // 2602265
FIELD: chemistry.SUBSTANCE: invention relates to a polyethylene composition for making moulded articles, containing linear low-density polyethylene (LLDPE), having relatively high values of ratio of MIF/MIE, and low density polyethylene (LDPE), having relatively high molecular weight, as well as moulded articles from said composition. Composition contains A) from 90 up to 99.7 wt% LLDPE with density of 0.91 to 0.94 g/cm3, which is determined in accordance with ISO 1,183 at 23 °C, and ratio MIF/MIE, equal to or greater than 20, where MIF is a melt flow index at 190 °C with load 21.60 kg, and MIE is a melt flow index at 190 °C with load 2.16 kg, both determined in accordance with ISO 1133, and B) from 0.3 to 10 wt% of LDPE with index MIE from 0.1 to 0.6 g/10 min.EFFECT: technical result consists in making articles from said composition, which have excellent balance of mechanical properties and optical properties.9 cl, 3 tbl, 3 ex

Adhesive composition based on polyethylene // 2600167
FIELD: chemistry.SUBSTANCE: invention relates to an adhesive composition based on polyethylene, intended for use as an adhesive layer in multilayer articles. Composition contains from 5 to 45 wt% low-pressure polyethylene; from 20.87 to 83.97 wt% of one or two linear low-pressure polyethylenes, representing an ethylene homopolymer or copolymer of ethylene and (C4-C8)-α-olefin with content of α-olefin comonomer 1.5-8 wt%, from 10 to 30 wt% copolymer of ethylene and (C4-C8)-α-olefin with content of α-olefin comonomer 10-40 wt%, functional monomer, preferably maleic anhydride, organic peroxide; vaseline oil and from 0.5 to 2 wt% of 5 % segregation-promoting additive concentrate. Composition is obtained by mixing components in melt in an extrusion or capacitive mixing equipment using a single-step or double-step method.EFFECT: obtained adhesive composition based on polyethylene has high adhesion strength.17 cl, 10 tbl

Flexible composition based on polyaromatic polyamide, technology of producing same and use thereof // 2599754
FIELD: chemistry.SUBSTANCE: invention relates to a composition for making articles containing, wt%: from 33 to 40 at least one cross-linked polyolefin, where polyolefin is obtained from at least one product (A) containing unsaturated epoxide, and at least one product (B), including unsaturated carboxylic acid anhydride, and from 3 to 10 at least one plasticiser, and remaining part consisting of at least one polyaromatic polyamide. Weight content of (A) and (B), designated as [A | and [B] is such that ratio [B]/[A | ranges from 3 to 14. Described also is a method for preparing composition, as well as use thereof.EFFECT: technical result is providing compositions for making articles having heat resistance, ageing resistance, Charpy impact strength at -40 °C higher than or equal to 7 kJ/m, modulus of elasticity in flexure less than 800 MPa, combined with uniform or smooth appearance of surface.39 cl, 2 tbl, 1 ex

Polyethylene composition for outer coating layer of steel pipes // 2599574
FIELD: chemistry.SUBSTANCE: invention relates to a polyethylene composition for external layer of coating of steel pipes. Composition contains HDPE, which is an ethylene homopolymer and/or copolymer of ethylene with alpha-olefin with density of 0.940 to 0.964 g/cm3, LDPE, which is a branched high-pressure polyethylene with density of 0.91 to 0.925 g/cm3, or a copolymer of ethylene with alpha-olefin with density of 0.904 to 0.935 g/cm3, or a copolymer of ethylene with vinyl acetate containing from 5 to 30 wt% vinyl acetate groups and having density of 0.925-0.955 g/cm3. Furthermore, composition contains a synthetic elastomer and/or synthetic rubber.EFFECT: use of such composition enables to obtain coatings on steel pipes with cold-resistant properties at temperatures lower than -45 °C and improved physical and mechanical properties, such as strength properties, and resistance to cracking in aggressive environment, as well as high resistance to indentation.1 cl, 5 tbl, 56 ex
Cross-linked elastomeric composition and product containing said composition // 2590555
FIELD: technological processes.SUBSTANCE: invention relates to use of a product obtained by extrusion and containing a cross-linked elastomeric composition as sealing gaskets, for example, in vehicles. Cross-linked elastomeric composition an ethylene and alpha-olefin multiblock copolymer comprising polymerised ethylene and alpha-olefin units, an elastomer including a block copolymer having at least two, identical or different, aromatic blocks which are separated by at least one elastomer block, and a cross-linkable polymer which is a three-block styrene-butadiene-styrene (SBS) copolymer. Multiblock ethylene and alpha-olefin copolymer has certain molecular weight distribution index. Multiblock copolymer of ethylene with alpha-olefin has certain volume weight and fusion point, and numerical values of said variable quantities are given with certain ratio.EFFECT: invention provides an efficient composition, which provides an improved tradeoff between weak residual deformation at compression, matte or satin appearance and resistance to UV rays.12 cl

Novel polymer composition for use in blow moulding // 2586977
FIELD: technological processes.SUBSTANCE: invention relates to a polymer composition, preparation method thereof, use of said polymer composition for blow molding of containers and containers themselves. Polymer composition has density from 0.940 to 0.949 g/cm3, flow melt index (HLMI) according to DIN EN ISO 1133:2005, condition G, at 190 °C and 21.6 kg, from 3 to 7 g/10 min and branching circuit (HLCBI) from 3 to 8. Polymer composition contains homopolymers of ethylene and/or copolymers of ethylene C3-C8-alpha-olefins and is produced by polymerisation of one or more catalysts Ziegler in series of at least two reactors polymerisation.EFFECT: obtained composition is improved stability of dimensions of molded article from mold and cooling to ambient temperature, as well as high surface quality of finished product and good balance of mechanical properties (rigidity, impact strength, resistance to formation and growth of cracks caused by exposure environment).11 cl, 3 tbl, 3 ex

Fibres, tapes and monofilaments based on copolymers of ethylene and alpha-olefins // 2586221
FIELD: textile industry.SUBSTANCE: invention relates to articles in form of fibre, tape or filament made from a polyethylene composition which includes a copolymer of ethylene and 1-hexene obtained by polymerisation in presence of a metallocene catalyst system in a gaseous medium. Molar ratio of hexene/ethylene in copolymer of ethylene and 1-hexene assumes following values: 0.0015, 0.0022, 0.0029 and 0.0045. EFFECT: fibres, tapes or filaments according to invention exhibit improved tensile properties, expressed as a balance between tenacity and elongation at break, and well suited for manufacture of articles such as artificial grass, woven and nonwoven fabrics, ropes, cordages, articles for making nets and flexible intermediate bulk containers.24 cl, 1 dwg, 7 tbl

Composition consisting of polyaromatic polyamide and cross-linked polyolefin // 2583455
FIELD: chemistry.SUBSTANCE: invention relates to a composition for making articles. Composition contains at least one polyaromatic polyamide and at least one cross-linked polyolefin. Cross-linked polyolefin is obtained from at least one product (A) containing unsaturated epoxide, and at least one product (B) containing unsaturated carboxylic acid anhydride. According to invention, weight content of (A) and (B), designated respectively as [A] and [B], are such that ratio [B]/[A] varies from 3 to 14, preferably from 4 to 9. Invention also describes a method of producing a composition and use thereof for making a single-layer or multilayer structure.EFFECT: technical result is smooth and glossy surface products, in particular, pipes, with very small amount or even complete absence of "adapter saliva".34 cl, 2 tbl, 10 ex

Novel trimodal polyethylene for use in blow molding // 2581366
FIELD: chemical industry.SUBSTANCE: invention relates to trimodal polyethylene suitable for blow moulding articles larger than 10 l. Trimodal polyethylene has density from 0.950 to 0.958 g/cm3, flow melt index (HLMI) according to ASTM D 1238, at 190 °C and 21.6 kg, from 2 to 7 g/10 min and value of nondimensional Hostalene index of trimodal polyethylene from 6 to 18. Polyethylene consists essentially of three weight fractions A, B and C, wherein fraction A with a low molecular weight is a homopolymer having a melt index (HLMI) of 18 to 30 g/10 min, and fractions B and C with medium and high molecular weight, respectively, are copolymers of ethylene and 1-butene comonomers. Wherein mixture of polymers A and B has a melt index (HLMI) from 8 to 14 g/10 min and a mixture of polymers A, B and C has a melt index (HLMI) from 3 to 6 g/10 min. Trimodal polyethylene is prepared by stepped polymerisation in presence of a solid Ziegler catalyst component and preferably in presence of a trialkylaluminium as a cocatalyst component.EFFECT: polyethylene according to invention has good processability, and a product after blow molding has improved stability of dimensions.19 cl, 3 tbl, 3 ex

Composite polymer packing material based on high pressure polyethylene with starch and silicon dioxide additives // 2568488
FIELD: chemistry.SUBSTANCE: composite polymer packing material based on high pressure polyethylene with starch and silicon dioxide additives is created by method of forge-rolling at temperature 150°C and following pressing at temperature 170°C for 10 minutes, and two fillers are kept in desiccator before addition into polymer and ratio of fillers constitutes: starch 4-6 vol %, aerosil 1 vol %, after which films are placed in field of corona discharge and charged at room temperature for 0.5-2.5 minutes to value of surface potential of 500-1000 V.EFFECT: invention makes it possible to reach the best electret state stability and can be applied as active biodegradable package with term of electret state storage to 130 days and increased rate of destruction.1 dwg

Composition of extrusion coating // 2548017
FIELD: chemistry.SUBSTANCE: invention relates to a multimodal polyethylene resin, an extrusion composition, containing it, and products, which can be used for manufacturing extrusion coatings, extrusion profiles and films.EFFECT: extrusion composition contains the multimodal polyethylene resin and from 2 to 20 wt % of a polyethylene low density resin, and is characterised by high rates of a technological line, high resistance to resonance in the process of the extrudate drawing and essentially reduced degree of necking.9 cl, 5 dwg, 10 tbl, 11 ex

Polyethylene composition and finished products obtained from it // 2545063
FIELD: chemistry.SUBSTANCE: group of inventions relates to polyethylene compositions for films or cast products. Composition has melt fluidity index at 5 kg/190°C (MI5 kg) from 0.25 to 3 g/10 min, Mz higher than 2000000 g/mol and lower than 370000 g/mol and Hostalen index (HI) value from 0.18 to 18. When melt fluidity index at 5 kg/190°C (MI5 kg) is higher than 1.9 g/10 min, Hostalen index (HI) value is higher than 1.EFFECT: polyethylene composition in accordance with invention, possessing specified molecular-weight distribution and long-chained branched structure, possesses improved technological properties, and obtained films have higher mechanical impact strength with film thickness being 10 mcm than at 20 mcm, in accordance with measurement of dart drop impact (DDI).9 cl, 4 tbl, 8 ex, 1 dwg

Increase of homogeneity of polyethylene mixtures // 2540073
FIELD: chemistry.SUBSTANCE: invention relates to a method of increasing homogeneity of mixtures of polyethylene, intended for manufacturing moulded products, films, tubes, wires and cables. A mixture of polyethylenes contains three fractures (A), (B) and (C) of a homo- or a copolymer of ethylene and at least one comonomer C3-C10 with different molecular weights. The low-molecular fraction A) has the weight-average molecular weight Mw lower than 40 kg/mol, the highly-molecular fraction B) has the molecular weight Mw higher than 250 kg/mol and the fraction C) has the intermediate molecular weight with the weight-average molecular weight Mw from 100 to 200 kg/mol. The mixture of polyethylenes has a single peak of melting as determined by means of differential scanning calorimetry (DSC).EFFECT: obtained mixtures of polyethylenes, due to the improved homogeneity, possess improved properties, in particular surface properties, good processability and good mechanical properties.16 cl, 9 dwg, 4 tbl, 3 ex

Pipes manufactured from polyethylene copolymer with slow crack growth // 2539594
FIELD: chemistry.SUBSTANCE: invention relates to pipe, possessing increased resistance to growth of pipe cracks and manufactured from polyethylene composition, as well as to application of phenol type stabiliser (C) and phenol type stabiliser (D) to increase resistance of pipes to slow crack growth. Pipe consists of polyethylene composition, which includes basic resin and phenol type stabilisers (C) and (D), which are different. Stabiliser (C) contains, at least, one ester group, and stabiliser (D) does not contain any ester group. Basic resin of polyethylene composition contains first ethylene homo- or copolymer (A) and second ethylene copolymer (B), with comonomer(s) for copolymer (B) and, possibly, copolymer (A) representing C3-C20 alpha-olefins.EFFECT: pipes in accordance with invention have stability in testing whole cut for creep (FNCT), measured in accordance with ISO 16770:2004, at least, 5000 h.11 cl, 1 tbl, 3 ex

oulding composition // 2536821
FIELD: chemistry.SUBSTANCE: invention relates to a polyethylene moulding composition intended for making pipes, conduits and cables, and a method of producing said composition. The composition has a multimodal molecular-weight distribution, density in the range of 920 to 960 kg/m3, melt flow index MFI190/2 in the range of 0.05 to 10 g/10 min and Shore hardness D, measured according to ASTM D2240-05 (15 s), of at least 56.0. The composition contains at least three ethylene polymer fractions having different molecular weight. Each of the fractions A, B and C is an ethylene homopolymer or a copolymer of ethylene with at least one C3-C10 comonomer.In the composition, one of the fractions A, B and C is an ethylene homopolymer and at least one of the other fractions is an ethylene copolymer with content of said C3-C10 comonomer of 1-15 wt %. Fraction A has weight-average molecular weight Mw in the range of 15 to 40 kg/mol, fraction B - in the range of 70 to 200 kg/mol and fraction C - in the range of 220 to 400 kg/mol.EFFECT: obtained polyethylene moulding composition has excellent mechanical properties, hardness and wear resistance, and also has high impact resistance and slow crack growth.13 cl, 6 dwg, 6 tbl

ethod of obtaining surface coating // 2532398
FIELD: chemistry.SUBSTANCE: method includes stages of mixing an acid-based polymer, a neutralisation agent and a technological additive to obtain a polymer composition. In the process of mixing a level of the acid-based polymer neutralisation constitutes from 25% to 75%. After processing the said polymer composition a polymer fabric, which is granulated into polymer particles, is obtained. The acid-based polymer represents resin with the melt flow index, measured at 190°C under a load of 2.16 kg, from 10 to 60 g/10 min, with the neutralisation agent being selected from the group, consisting of potassium hydroxide, aluminium hydroxide, calcium hydroxide, zinc oxide or their mixtures, salt of metal and fatty acid and a partly or completely neutralised ionomer or their mixtures.EFFECT: polymer coatings possess a low negative impact on the environment, evaluated by indices of life cycle evaluation.26 cl, 1 dwg, 10 tbl

Colourless synthetic binding agent // 2531190
FIELD: chemistry.SUBSTANCE: invention relates to a colourless synthetic binding agent, which is applied in the road-industrial area. The colourless synthetic binding agent contains oil of a vegetable origin, resin of a petroleum origin and a polymer. The quantity of oil of a vegetable origin in the binding agent constitutes 10 wt % or more, and the quantity of the polymer in the binding agent constitutes 15 wt % or less.EFFECT: colourless synthetic binding agent in accordance with invention possesses good consistency, reduced viscosity, acceptable behaviour at low temperature and acceptable elastic properties.18 cl, 7 tbl

Hot-melt adhesive based on metallocene catalysed olefin/α-olefin copolymers // 2528665
FIELD: chemistry.SUBSTANCE: invention relates to hot-melt adhesives. The hot-melt adhesive contains 5-40 wt % of a copolymer based on ethylene and C3-C20 α-olefin, which is obtained by metallocene-catalysed polymerisation, 10-65 wt % of tackifying resin, 0-35 wt % of a plasticiser and 0.01-30 wt % of additives. The additives are selected from stabilisers, adhesion promoters, fillers or pigments, waxes and/or other polymers, wherein the total amounts to 100%. The copolymer is a block copolymer having invariable elastic properties in the range of 0°C to 25°C, measured as a ratio of the storage modulus E′ according to (E'0C-E'25C)/E'25C<1.5.EFFECT: method improves process properties of the hot-melt adhesive while preserving mechanical properties in the temperature range to 50°C.18 cl, 5 ex

Floor or wall covering // 2524310
FIELD: chemistry.SUBSTANCE: invention relates to a PVC-free floor or wall covering comprising at least one layer of a thermoplastic composition. The composition contains a polymer matrix comprising at least two polymers and at least 100 pts.wt of least one filler per 100 pts.wt of the polymer(s). Said matrix contains 10-40 pts.wt of a polymer with carboxylic acid anhydride groups in amount of 0.5-3.1 wt %, and the other polymer of the matrix is selected from a group comprising EVA, EMA, EBA, EEA, EPM, EPDM, VLDPE, LLDPE, POE, POP and mixtures thereof, and has melt flow index between 0.6 and 3 g/10 min at 190°C and mass of 2.16 kg. The total amount of combined polymers in the composition is 100 pts.wt.EFFECT: floor or wall covering obtained according to the invention preferably in form of rolls or tiles has improved residual indentation properties and is also suitable for recycling.14 cl, 7 dwg, 9 tbl
etal wire insulating coating // 2524232
FIELD: chemistry.SUBSTANCE: coating comprises an adhesive sublayer of a thermoplastic adhesive and a functional layer of a nanostructured composite material based on polyethylene. The composite material of the functional layer has a polyethylene matrix and montmorillonite particles dispersed in the matrix in amount of 0.1-2 wt %.EFFECT: improved physical and mechanical properties of the coating.12 cl, 2 ex

Impact resistant low-density polyethylene (lldpe) composition and films made therefrom // 2517166
FIELD: chemistry.SUBSTANCE: invention relates to a low-density ethylene polymer with a multimodal comonomer distribution, a method for production thereof and moulded articles, including films, made from said polymer. The multimodal polyethylene has a wide molecular weight distribution MWD in the range from 3 to 8 and contains two polymer components. The first polymer component is 70-95 wt % copolymer of ethylene with at least one C3-C20-α-olefin comonomer, having MWD less than 5, CDBI greater than 60% and high-load melt index (@21.6 kg, 190°C) of 10-100 g/10 min. The second polymer component is 5-30 wt % substantially homopolymeric polyethylene, having MWD greater than 10, CDBI greater than 80% and high-load melt index (@21.6 kg, 190°C) of 0.2-20 g/10 min. Said multimodal polyethylene is obtained in a single reactor using a catalyst system containing at least two catalysts in form of transition metal complexes.EFFECT: polyethylene disclosed herein has considerably improved resistance to mechanical factors and excellent processing properties, which enable to avoid use of process additives when processing films.13 cl, 4 dwg, 3 tbl

Polymer composition for cross-linked pipes // 2516544
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
Polyethylene possessing higher rate of crystallisation and improved resistance to cracking under impact of environment // 2513703
FIELD: chemistry.SUBSTANCE: invention relates to composition of polymodal polyethylene, which has improved resistance to cracking under impact of environment and higher rate of crystallisation. Composition contains ethylene homopolymer, two ethylene copolymers and nucleating agent in amount from 20 to 5000 ppm in terms of entire polyethylene composition. Second ethylene copolymer has higher molecular weight than first ethylene copolymer, and first ethylene copolymer has higher molecular weight than ethylene homopolymer.EFFECT: obtained polyethylene composition possesses resistance to cracking under impact of environment (ASTM D1693, Conditions B, in 100% Igepal) more than or equal 40 days, and half time of crystallisation lower than or equal 70% of half time of crystallisation of polymodal polyethylene without nucleating agent.12 cl, 1 tbl, 12 ex

ethod of obtaining elastic copolymers of ethylene and alpha-olefins // 2512536
FIELD: chemistry.SUBSTANCE: claimed invention relates to method of obtaining copolymers of ethylene and α-olefin and to copolymers, obtained by claimed method, which can be adapted to wide number of various applications, including film, electric wires and thermomelting glues. Copolymers have content of (C3-C18) α-olefin from 10 wt % to 45 wt % of copolymer, molecular-weight distribution (Mw/Mn) from 1.5 to 3.0 and density 0.850-0.900 g/cm3. Method of obtaining copolymers of ethylene and (C3-C18) α-olefin is realised in solution at temperature of copolymerisation from 80°C to 140°C in single reactor or in continuous reactors, connected successively or in parallel way for 2-stage reactions. Catalytic composition contains activator and catalyst, composition of which includes compound with transition metal, represented by chemical formula (1) , where X2 represents and the remaining values of radicals are given in the invention formula.EFFECT: method of copolymerisation of ethylene with α-olefin makes it possible to obtain copolymer, which has strict value of molecular-weight distribution and homogeneous distribution of density, with density not higher than 0,910 g/cm3, with high activity and excellent reaction activity on highly molecular α-olefin.11 cl, 2 tbl, 2 dwg, 12 ex

Thermoplastic polyolefin compounds having low sensitivity to flame treatment // 2506287
FIELD: chemistry.SUBSTANCE: invention relates to a thermoplastic polyolefin composition for pressure moulding painted and flame pretreated articles. The composition contains a continuous phase (matrix) (M) of a propylene homopolymer or a propylene copolymer with weight content of the comonomer of not more than 20%, which form a dispersion phase (E) with characteristic viscosity of at least 2.2 dl/g, a first elastomer which is copolymer rubber based on ethylene-C3-C8-alpha-olefin, and a second elastomer, and inorganic filler. The second elastomer is different from the first elastomer and is a random copolymer based on ethylene/alpha-olefins, the composition of which includes ethylene and up to 45% of one or more C3-C8 alpha-olefins.EFFECT: articles pressure moulded from the disclosed composition have low or no sensitivity to flame treatment during flame pretreatment before depositing a clean paint layer and also demonstrate high heat conductivity.10 cl, 4 tbl, 15 ex

Biodegradable highly filled thermoplastic composition using starch and nanomodifier // 2490289
FIELD: chemistry.SUBSTANCE: invention relates to a biodegradable highly filled thermoplastic composition used in making films and consumer packaging. The composition contains polyethylene, biodegradable filler in form of potato starch, process additives: oligoepoxy ether with molecular weight of 1800-3500 and content of epoxy groups of 2.0-4.0% in nano-form and nonionic and cationic surfactants.EFFECT: obtained composition has good process parameters, articles made from the composition are biodegradable under the effect of light, moisture and soil microflora.2 tbl, 6 ex

Polyethylene compositions, preparation methods thereof, articles made therefrom and method of making said articles // 2487015
FIELD: chemistry.SUBSTANCE: group of inventions discloses a polyethylene composition, a method for preparation thereof, articles made therefrom and a method of making said articles. The polyethylene composition contains (1) 100 wt % or less of units derived from ethylene; and (2) less than 15 wt % of units derived from one or more α-olefin comonomers. The polyethylene composition has density of 0.907-0.975 g/cm3, molecular weight distribution (Mw/Mn) of 1.70-3.62, flow melt index (I2) of 2-1000 g/10 min, molecular weight distribution (Mz/Mw) of less than 2.5 and vinyl unsaturation of less than 0.06 vinyl groups per thousand carbon atoms present in the backbone chain of said composition. The method of producing the polyethylene composition includes the following steps: (1) (co)polymerisation of ethylene and at least one or more α-olefin comonomers in the presence of a hafnium-based metallocene catalyst through a gas-phase (co)polymerisation process in a reactor in a single step; and (2) a polyethylene composition is obtained, where the polyethylene composition has parameter values given according to the invention: density, molecular weight distribution (Mw/Mn), flow melt index (I2) and vinyl unsaturation. Articles made by pressure moulding contain the polyethylene composition which contains (1) 100 wt % or less of units derived from ethylene and (2) less than 15 wt % of units derived from one or more α-olefin comonomers. The polyethylene composition has the following parameters: density, molecular weight distribution (Mw/Mn), flow melt index (I2), molecular weight distribution (MZ/Mw) and vinyl unsaturation in accordance with its parameters given above. The method of making pressure moulded articles includes the following steps: (a) selecting a polyethylene composition which contains (1) 100 wt % or less of units derived from ethylene; and (2) less than 15 wt % of units derived from one or more α-olefin comonomers; (b) pressure moulding said polyethylene composition; and (c) the pressure moulded article is then made.EFFECT: high efficiency of the method.

Polyethylene compositions, method for production thereof, fibres made therefrom and method of producing fibre // 2486214
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
Ionomer tubes of higher wear resistance // 2483925
FIELD: process engineering.SUBSTANCE: invention relates to tubes intended for transportation of highly abrasive solid particles and sludge, particularly, to ionomer tubes. Tubular or cylindrical article innermost layer that features thickness of about 6.3-102 mm and includes ionomer. Invention covers also methods of tube production and piping of abrasive materials.EFFECT: longer life, higher wear resistance.18 cl, 31 tbl, 181 ex

ultimodal ethylene copolymer, method for production thereof, tube made therefrom and use of said tube // 2472818
FIELD: chemistry.SUBSTANCE: multimodal copolymer of ethylene and one or more alpha-olefins contains 4-10 carbon atoms and is characterised by density of 924-935 kg/m3, melt flow index PTR5 of 0.5-6.0 g/10 min, melt flow index PTR2 of 0.1-2.0 g/10 min, and shear thinning index UVS2.7/210 of 2-50. The multimodal ethylene copolymer is obtained in two steps by polymerisation in the presence of a catalyst with a single polymerisation centre of ethylene, hydrogen and one or more alpha-olefins having 4-10 carbon atoms. A low-molecular weight component (A) of the ethylene polymer is obtained in a first polymerisation zone and a high-molecular weight component of the ethylene copolymer (B) is obtained in a second polymerisation zone. The first and second polymerisation steps can be carried out in any order and the next step is carried out in the presence of a polymer obtained at the previous step. Components (A) and (B) are present in the multimodal ethylene copolymer in amount of 30-70 wt % and 70-30 wt %, respectively, of the total amount of components (A) and (B). Component (A) has weight-average molecular weight of 5000-100000 g/mol and density of 945-975 kg/m3, and component (B) has weight-average molecular weight of 100000-1000000 g/mol and density of 890-935 kg/m3.EFFECT: tubes have good mechanical properties and are suitable for transporting liquids under pressure.15 cl, 1 tbl, 3 ex

ultimodal ethylene copolymer, method for production thereof, tubes made therefrom and use of said tubes // 2472817
FIELD: chemistry.SUBSTANCE: multimodal ethylene copolymer has density of 924-960 kg/m3, melt flow index STR5 of 0.5-6.0 g/10 min, melt flow index STR2 of 0.1-2.0 g/10 min and shear thinning index IUVS2.7/210 of 2-50. The multimodal ethylene copolymer contains at most 100 ppm by weight of volatile compounds. The multimodal ethylene copolymer is obtained in two steps by polymerisation in the presence of a catalyst with a single polymerisation centre of ethylene, hydrogen and one or more alpha-olefin having 4-10 carbon atoms. A low-molecular weight component (A) of the ethylene polymer is obtained in a first polymerisation zone and a high-molecular weight component of the ethylene copolymer (B) is obtained in a second polymerisation zone. The first and second polymerisation steps can be carried out in any order and the next step is carried out in the presence of a polymer obtained at the previous step. Components (A) and (B) are present in the multimodal ethylene copolymer in amount of 30-70 wt % and 70-30 wt %, respectively, of the total amount of components (A) and (B). Component (A) has weight-average molecular weight of 5000-100000 g/mol and density of 945-975 kg/m3, and component (B) has weight-average molecular weight of 100000-1000000 g/mol and density of 890-935 kg/m3.EFFECT: improved properties of the compound.15 cl, 1 tbl, 3 ex
ethod of producing stabilised compositions based on low-pressure polyethylene with high cracking resistance // 2471821
FIELD: chemistry.SUBSTANCE: invention relates to the technology of producing a stabilised composition based on low-pressure polyethylene which is meant for blow moulding and pressure casting articles. The method is realised by mixing, in a molten mixture, polyethylenes of different density and additives. The mixture of polyethylenes, taken in granular form, comprises high-density polyethylene and low-density linear polyethylene or high-density polyethylene and medium-density linear polyethylene. The additives are added the composition in form of an additive based on low-density linear polyethylene, which is obtained from a molten granular polymer concentrate. The additive contains a phenol antioxidant which is a sterically hindered phenol, and an ethylene and vinyl acetate copolymer which contains 9-16 wt % vinyl acetate, with the weight ratio of the low-density linear polyethylene to the ethylene and vinyl acetate copolymer ranging from 0.8:1 to 4.3:1. Content of the ethylene and vinyl acetate copolymer in the composition ranges from 0.5 to 1.5 wt % and content of the phenol antioxidant ranges from 0.05 to 0.15 wt %.EFFECT: stabilised compositions obtained using the disclosed method have an optimum set of physical and mechanical properties and high cracking resistance.4 tbl, 22 ex
 
2551262.
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