Crosslinking, e.g. vulcanising, of macromolecules (C08J3/24)

C   Chemistry; metallurgy(318327)
C08J3/24                     Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects b29c0035000000; crosslinking agents c08k)(195)

Polymeric hydrogels and methods for their preparation // 2641749
FIELD: pharmacology.SUBSTANCE: invention relates to a polymeric hydrogel comprising carboxymethyl cellulose and citric acid. This citric acid participates in the formation of cross-links in carboxymethylcellulose, wherein the said polymeric hydrogel has a swelling ratio of 50 to 300. The invention also relates to application of said hydrogel for use in the treatment of obesity in a patient in need thereof, as well as for the manufacture of a medicament for obesity treatment in a patient in need thereof.EFFECT: increased application efficiency.12 cl, 2 dwg, 8 tbl
Super-absorbing polymer and method of its manufacture // 2641700
FIELD: chemistry.SUBSTANCE: superabsorbent acrylate resin is proposed with particles included therein selected from silica, titania, alumina, and combinations thereof and having the following properties: i) -ii): i) the BET specific surface area is in the range of 300-1500m2/g, ii) the degree of porosity is 50% or more. The particle size is in the range of 2 nm to 50 mcm, the superhydrophobicity is equal to the contact angle with water 125° or more, the number of particles is 0.001 to 1 pts wt per 100 pts wt of superabsorbent acrylate resin. A method for producing the claimed resin is also provided.EFFECT: proposed superabsorbent resin has a high degree of processability, in particular reduced crumbling of resin during application processes.10 cl, 4 tbl
ethod for obtaining of composition based on hyaluronic acid // 2640911
FIELD: cosmetology.SUBSTANCE: invention is a process for preparation of a composition for use as a dermatological excipient in cosmetic and medical applications in the form of a gel comprising a crosslinked first polymer, optionally a second polymer that can be crosslinked or uncross linked, and water, wherein the first and second polymers are selected from polysaccharide, and the process comprises at least steps (i), (ii) and (iv), and optionally step (iii), wherein step (i) is to crosslink a mixture including the first polymer and water, step (ii) is to finish the crosslinking of step (i), step (iii) is to optionally blend the product obtained in step (ii) with the second polymer, step (iv) consists in dialysis of the product obtained in step (ii) or in step (iii), wherein the dialysis step (iv) comprises steps (iv.1)-(iv.3)(iv.1) which is extrusion of the product, obtained in step (ii) or (iii) through the first sieve and then extrusion of the product extruded through the first sieve through the second sieve, in which the second sieve hole size is smaller than the first sieve hole size; or extrusion of the product, obtained in step (ii) or (iii) through the first sieve and then extrusion of the product extruded through the first sieve through the second sieve, and then extrusion of the product extruded through the second sieve through the third sieve, in which the second sieve hole size is smaller than the first sieve hole size, and the third sieve hole size is smaller than the second sieve hole size, where step (iv.2) is to fill the dialysis membrane with the product obtained in step (iv.1), step (iv.3) is to process the filled membrane obtained in step (iv.2) with dialysis solution.EFFECT: obtaining of exclusively homogeneous compositions.14 cl, 14 ex

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
ethod for curing thermoreactive resin // 2636149
FIELD: chemistry.SUBSTANCE: method is described comprising the step of contacting resin with (i) 0.1-5 parts by weight based on 100 parts by weight of resin, one or more imines of the structure , where y=1 or 1, Z=1-4 and y+z≥2, X is O, R1 is a cyclic alkylene group having 2-18 carbon atoms; R2-R3 are linear or branched alkyl groups having 1-18 carbon atoms; R4 and R5 are hydrogen, and (ii) 0.5-5 parts by weight based on 100 parts by weight of a peroxide resin.EFFECT: method improvement.10 cl, 1 tbl, 1 ex

ethod of obtaining dynamically volcanized alloys // 2635610
FIELD: technological processes.SUBSTANCE: alloy includes at least one elastomer and at least one thermoplastic resin. According to the method, the thermoplastic resin is added to the extruder in two stages with the intermediate addition of a compatibilizing agent. In addition, vulcanizers of elastomers are added to the extruder during the final addition of the thermoplastic resin.EFFECT: invention allows to obtain dynamically vulcanized alloys with unique morphological properties, which are characterized by good impermeability and low-temperature elasticity.19 cl, 3 dwg, 9 tbl
Associated composition, fashionable to sewing by michael connection reactions (rma) // 2625122
FIELD: chemistry.SUBSTANCE: invention relates to a crosslinkable composition to crosslinking by the Michael addition reaction (RMA) to obtain a cured composition containing a component A having at least two acidic protons of the C-H in activated methylene or methine groups (RMA-donor group), a component B with at least two activated unsaturated groups (RMA-acceptor group) and C catalytic system containing or capable of producing a basic catalyst capable of activating RMA reaction between components A and B. The crosslinkable to position further comprises containing XH component D group, which also serves as a donor in the reaction of Michael addition, capable of reacting with component B under the influence of C catalyst, wherein X represents N, P, O, S, or wherein X is a C as a part of the acidic methyl group (CH3). In this X-H group of component D is characterized by a pKa value determined in aqueous medium, at least one unit less than the corresponding value in the C-H groups in component A. Component A is preferably a malonate or acetoacetate. Also described are a set of two parts to obtain a crosslinkable composition, applying the component D as an additive to the crosslinkable RMA compositions blend RMA-additives for coatings of crosslinkable compositions use a mixture of RMA-additives in crosslinkable RMA-composition applying crosslinkable compositions for coatings as well as coating compositions, paints or films. As described coating composition further comprising one or more additives for coatings, such as pigments with the binder and the solvent.EFFECT: providing a reaction time of induction profile for which slows curing and after which it is accelerated to quickly complete curing, the possibility to align after the application of the coating composition as a liquid with subsequent solidification, the absence of defects and surface irregularities of the coating.30 cl, 7 dwg, 10 tbl, 15 ex
Vulcanized compositions based on epoxy-containing group of nitrile rubber // 2622655
FIELD: chemistry.SUBSTANCE: composition comprises at least one epoxy group containing nitrile rubber which contains repeating units of one conjugated diene, at least one α,β-unsaturated nitrile and optionally one or more other copolymerizable monomers, but which lacks repeating units of nonconjugated cyclic polyenes; as crosslinking agent at least one Lewis acid; and at least one cross-linking accelerator selected from the group consisting thiurams, ksatogenaty, thiourea, dithiocarbamates and carbamates.EFFECT: invention produces vulcanizates with favorable performance compression set at room temperature, and at the same time a high tensile stress and elongation at break optimal.6 cl, 14 tbl, 4 ex

Rubber mixtures // 2619696
FIELD: chemistry.SUBSTANCE: group of inventions can be used for the production of moulded items used in parts and elements of pneumatic suspensions, tires, tire treads, cable casings, hoses, drive belts, conveyor belts, tires, shoe soles and shock-absorbing elements. For obtaining rubber mixtures, at least one ACM polyacrylate rubber, at least one oxide or silicate filler or carbon black, at least one epoxysilane, crosslinking agents and vulcanisation accelerators are mixed. The epoxysilane is represented by the formula wherein X - OCH2CH3, RI represents a branched or unbranched, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic / aromatic hydrocarbon group with two bonds and a C1-C30, which is optionally substituted, or an alkyl ether group with two bonds.EFFECT: increase of the dynamic properties of rubber mixtures.9 cl, 1 dwg, 8 tbl
Process for continuous production of halogen-free thermoplastic elastomer compositions // 2614277
FIELD: chemistry.SUBSTANCE: invention relates to thermoplastic elastomer compositions and methods for continuous production of said compositions. continuous method for production of dynamically cured thermoplastic elastomer comprises mixing at first stage of a mixing device of continuous action a thermoplastic resin, a halogen-free elastomer, with polyolefin content of more than 3.5 mol%, which is modified with unsaturated carboxyl compound, and a curing agent. At second stage a curing system is added, which is suitable for use with halogen-free elastomer for dynamic vulcanisation.EFFECT: invention enables to obtain materials with improved relative elongation at break and ultimate tensile strength.15 cl, 2 tbl
ixture of materials // 2613436
FIELD: construction.SUBSTANCE: invention relates to the sealing profile for doors and windows made of the mixture of materials including about %: ethylene-propylene-diene rubber 10-50, propylene copolymer with ethylene 8-50, the filler 50-70, paraffin oil 0-20, accelerator - sulfur donor 0.1-5, sulfur 0.5-5, zinc oxide 0.5-3. The method of producing the window or door structural element is also described which uses at least two sealing profiles of the mixture of materials containing ethylene-propylene-diene rubber and propylene copolymer with ethylene, wherein the mixture of materials is blended, shaped, and then cross-linked under the influence of temperature followed by retracting of the sealing profiles into the corresponding structural elements and by welding of the structural elements and the sealing profiles to each other in one pass.EFFECT: invention provides weldability of the sealing profile.13 cl
odified rubber mother batch, and rubber mixture and vulcanized rubber made therefrom, and methods of their production // 2608764
FIELD: rubber industry.SUBSTANCE: invention relates to modified rubber master batch and its preparation method, rubber mixture, made from it, and vulcanized rubber and method of their production. Modified rubber mixture consists of non-cross-linked rubber and synthetic particles and/or natural rubber, having radiation cross-linked structure, dispersed in it, with average cross-linked rubber particles size from 20 to 500 nm and gel content of 60 wt% or more. Non-cross-linked rubber is styrene-butadiene rubber. Weight ratio of rubber particles, having radiation cross-linked structure, to non-cross-linked rubber ranges from more than 20:80 to less than or equal to 80:20. Rubber mixture contains mixture of modified rubber component and base rubber, in which modified rubber mother batch is present in amount from 1 to 70 weight parts per 100 weight parts of base rubber.EFFECT: invention allows to reduce rolling resistance, increase slippage resistance on wet road and increase vulcanized rubber mixture wear resistance.15 cl, 16 tbl, 13 ex
Production of molecular-imprinted polymers as result of cross-linking // 2608743
FIELD: technological processes.SUBSTANCE: invention relates to insoluble molecular imprinted polymers (MIP) production method. Method of insoluble molecular imprinted polymers (MIP) production includes: a) producing soluble or semi-soluble MIP polymers, which are characterized by fact, that 1) all polymers will be connected with matrix agents, by which they were imprinted and 2) have dimensions, which enable their separation at chromatographic stage using chromatography with compacted adsorbent layer, where dimensions of soluble or semi-soluble MIP, produced at stage a), are such, that they will be filtered through membrane filter having cutoff of less than or equal to 900 nm, b) cross-linking of soluble or semi-soluble MIP polymers from stage a) so, that to produce insoluble MIP, which bind said matrix agents, and c) optionally extraction, concentration or purification of MIP polymers produced from cross-linking at stage b).EFFECT: implementation of new method of insoluble MIP polymers producing, which can be separated from aqueous solution, produced material makes it suitable for use in cleaning during use of chromatography with compacted adsorbent layer.17 cl, 1 ex
Rubber mixture, preparation method thereof and cured rubber produced therefrom // 2607581
FIELD: rubber industry.SUBSTANCE: invention relates to rubber mixture, method of its production and cured rubber from it. Rubber mixture contains non-crosslinked rubber and rubber particles, having radiation cross-linked structure, dispersed in it. Particles of rubber, are particles of synthetic rubber and/or natural rubber particles with average particles size from 20 to 500 nm and content of gel of 60 wt%. or more. Non-crosslinked rubber is butadiene-styrene rubber. Weight ratio of rubber particles, having radiation cross-linked structure, and non- cross-linked rubber ranges from 1:99 to 20:80. Rubber mixture is produced by mixing of components, containing non- cross-linked rubber latex and rubber particles latex, having radiation cross-linked structure, and their subsequent coagulation. Rubber particles latex, having radiation cross-linked structure, is rubber latex after radiation cross-linking.EFFECT: invention allows to improve rolling resistance, resistance to slipping on wet road and wear resistance of cured rubber from rubber mixture.10 cl, 9 tbl, 5 ex

Vulcanized compositions based on epoxy groups containing nitrile rubbers // 2604218
FIELD: chemistry.SUBSTANCE: invention relates to vulcanized compositions based on epoxy groups containing nitrile rubbers. Vulcanized composition in the solid form contains nitrile rubber with epoxy groups, which contains repeating links, conjugated diene derivatives and α,β-unsaturated nitrile. As a cross-linking agent the composition contains Lewis or Brensted acid. Herewith the amount of other cross-linking agents is less than 2.5 wt% per 100 wt% of nitrile rubber with epoxy groups.EFFECT: vulcanizates as per the invention have extremely low residual compression at room temperature, 100 °C and 150 °C and are characterized by high tension stress and high breaking elongation.14 cl, 22 tbl

Thermoplastic elastomer compositions // 2600447
FIELD: chemistry.SUBSTANCE: invention relates to dynamically vulcanised alloy for making tyres and other industrial rubber articles. Alloy includes at least one elastomer containing isobutylene and at least one thermoplastic resin. At that, elastomer is contained in form of small-size particles phase, dispersed in continuous phase of thermosetting resin. Elastomer in alloy is cured by vulcanising system, which contains 1.0-10 phr of metal oxide and not more than 0.1 phr of any vulcanisation accelerators. At temperature of vulcanisation, located in range of 200-270 °C, elastomer has stepped profile curing, at first curing decelerated until degree of vulcanisation, equal to 10 %, and degree of vulcanisation, equal to 90 %, for time equal to less than 15 minutes. Present invention relates to thermoplastic elastomer composition with improved characteristics compared to previously existing similar compositions.EFFECT: disclosed alloy is stable and its characteristics do not change during operation or processing of thermoplastic elastomer at temperature above temperature of curing or during time of thermoplastic elastomer vulcanisation.12 cl, 3 dwg, 3 tbl

Thermoplastic elastomeric composition and preparation method thereof // 2599638
FIELD: technological processes.SUBSTANCE: invention relates to dynamically vulcanised alloys (DVA) and, in particular, to DVA, having improved processing characteristics and stability. Present invention also relates to methods of producing DVA. Disclosed is method of producing thermoplastic elastomer composition, involving: dynamic vulcanisation of isobutylene elastomer component, dispersed in form of domain in continuous phase containing at least one thermoplastic resin, to produce post vulcanised dynamically cured alloy; and mixing of post vulcanised dynamically cured alloy with stabiliser based on low-molecular weight aromatic amine, present in amount larger than or equal to 1.5 wt. parts to obtain thermoplastic elastomer composition. Also invention describes thermoplastic elastomer composition obtained using said method comprising post vulcanised dynamically cured alloy and stabilizer based on low-molecular weight aromatic amine, in amount larger than or equal to 1.5 wt. parts, where post vulcanised dynamically vulcanised alloy contains isobutylene elastomer component, dispersed in form of domain in continuous phase containing at least one thermoplastic resin; and thermoplastic elastomer composition obtained by method including: dynamic vulcanisation of halogenated isobutylene elastomer component, where elastomeric component is mixed with not more than 10 wt. parts of cross-linking agent, dispersed in form of domain in continuous phase containing polyamide, to produce post vulcanised dynamically cured alloy; and mixing post vulcanised dynamically cured alloy with 1.5-10 wt. parts of stabiliser based on low-molecular weight aromatic diamine to produce thermoplastic elastomer composition.EFFECT: obtaining elastomeric compositions having improved UV resistance and process characteristics.18 cl, 8 tbl

ethod for producing of polyoligocyclopentadiene and glass microspheres based composite material and composite material // 2596192
FIELD: chemistry.SUBSTANCE: method of producing composite material based on polyoligocyclopentadiene and glass microspheres involves mixing dicyclopentadiene with at least one of organosilanes, selected from group of at least with one of polymer stabilizers selected from a group, and glass microspheres, obtained mixture is heated in an inert atmosphere to temperature of 50-220 °C, held at this temperature for 15-360 minutes, and then cooled to room temperature. Thereafter, the mixture one introduces at least one of radical initiators selected from a group and catalyst, which is a compound of general structural formula as defined in the patent claim, catalyst is preliminarily dissolved in at least one of methacrylates, selected from a group: glycidalmethacrylate, ethylene dimethacrylate, diethylene glycol dimethacrylate, butylene glycol dimethacrylate, 2-hydroxyethylmethacrylate, 2-hydroxypropyl methacrylate, tricyclo decane di-methanol dimethacrylate, ethoxylated Bisphenol A, dimethacrylate, trimethylolpropane trimethacrylate, wherein mixture components are in following ratio, wt%: organosilanes 0.2-3; polymer stabilizers 0.1-3; radical initiators - 0.1-4; Methacrylates 0.3-25; catalyst 0.001-0.02; dicyclopentadiene 1-60; glass microspheres is rest. Also disclosed is composite material. Result is production of material providing compression strength of not less than 50 MPa, bending strength of not less than 25 MPa, tensile strength not less than 25 MPa, Izod impact strength without cut is not less than 3.5 kJ/m2 at glass transition temperature of 150 °C and material density of 0.8-0.6 g/cm3.EFFECT: obtaining composite material based on polyoligocyclopentadiene and glass microspheres.3 cl, 32 ex

ethod for producing composite material based polyoligocyclopentadiene and wollastonite and composite material // 2579118
FIELD: chemistry.SUBSTANCE: invention relates to composite materials. Method of producing composite material based on polyoligocyclopentadiene and wollastonite involves obtaining a liquid composition of wollastonite and oligocyclopentadienes by series of operations processing wollastonite solution silane finishing agent selected from a group, drying in vacuum at 90-110 °C, grinding and screening particles Wollastonite, characterised by ratio of length of particles to the thickness within 3…25:1, mixing of produced particles with dicyclopentadiene, heating to temperature of 155-210 °C, its holding at this temperature for 15-360 minutes and cooling to room temperature. Preliminarily mixed with the following components: at least one of polymer stabilizers selected from a group, at least one of radical initiators selected from a group, at least one of methacrylates, selected from a group and catalyst with structural formula, both in the patent claim, combines the produced mixture mixing components with the composition of wollastonite and oligocyclopentadienes, combined mixture components are in the following quantities the following, wt. %: polymer stabiliser or a mixture of stabilisers 0.1-3; radical initiator or a mixture of initiators 0.1-4; methacrylate or a mixture of methacrylates 0.3-20; catalyst 0.001-0.02; composition of oligocyclopentadienes and wollastonite - the rest. Combined mixture is heated to temperature of 50-320 °C and holding at this temperature for 1-360 minutes. Also disclosed is a composite material based on polyoligocyclopentadienes and wollastonite.EFFECT: technical result is production of material with good properties.2 cl, 32 ex

Improvements in area of composite materials // 2577276
FIELD: chemistry.SUBSTANCE: method for obtaining curable composite material includes stages of mixing together liquid curable resin and curing reagent, which has melt point higher than 100°C, to obtain liquid mixture of curable resin and curing reagent. In obtaining curable composite material reinforcing filler with fibrous structure is at least partly soaked with curable resin, mixed with curing reagent. After obtaining curable composite material curing of composite material is realised by subjecting it to impact of higher temperature under pressure not higher than 3 bar of absolute pressure to obtain cured composite material.EFFECT: invention improvement.16 cl, 4 dwg, 3 ex

ethod for polydicyclopentadiene cross-linking // 2574692
FIELD: chemistry.SUBSTANCE: polymer matrix is prepared by introduction of stabiliser into dicyclopentadiene at room temperature, dissolution of elementary sulphur in quantity 0.1-0.5 wt %. Mixture is mixed for 1-150 min, ruthenium catalyst of metathesis polymerisation of dicyclopentadiene at temperature from 0°C to 50°C is introduced and obtained mixture is mixed for 1-150 min. Obtained matrix is heated to temperature 160-300°C at rate 4-10 C/min, exposed at said temperature for 5-240 min and cooled to room temperature.EFFECT: increase of heat resistance and physical-chemical indices of polycyclopentadiene, compressive strength higher than 120 MPa and reduction of swelling degree in oil.4 cl, 36 ex

Thermodynamically stable crosslinking polyolefin composition with trimethylolpropane trimethacrylate curing accelerator // 2573557
FIELD: chemistry.SUBSTANCE: composition contains high-pressure polyethylene, a curing agent in the form of dicumyl peroxide, a trimethylolpropane trimethacrylate curing accelerator curing accelerator in the form of a 20 wt % concentrate in a copolymer of ethylene and vinyl acetate or in a copolymer of ethylene, vinyl acetate and maleic anhydride.EFFECT: crosslinking composition has a high curing rate and improved operational properties at high temperatures.6 cl, 1 tbl, 4 ex

Biodegradable material and method of producing biodegradable material // 2572849
FIELD: chemistry.SUBSTANCE: method relates to biodegradable material production. Biodegradable material, which is a chemical bond-crosslinked product, formed by a multivalent compound A, which includes 3 or more functional groups X, selected from a group consisting of a hydroxyl group, a thiol group and an amino group, and a multivalent compound B, which includes 3 or more functional groups Y, selected from a group consisting of a carboxyl group, an isocyanate group and a thioisocyanate group, where the chemical cross links are formed via condensation reaction of said functional group(s) X and said functional group(s) Y, where the value (y+z)/(x+z) ranges from 1.2 to 4.0, if MA≥MB, and the value (x+z)/(y+z) ranges from 1.2 to 4.0, if MA<MB, where x denotes the number of functional groups X not involved in the condensation reaction with said functional groups Y, y denotes the number of functional groups Y not involved in the condensation reaction with said functional groups X, z denotes the number of said cross links, MA denotes the weight-average molecular weight of said multivalent compound A and MB denotes the weight-average molecular weight of said multivalent compound B. The invention also discloses a vessel embolisation material, an anti-adhesive material, a wound-dressing material, a blood-staunching material and a material which prevents involuntary urination.EFFECT: material has high compression force, high degree of recovery, high complex modulus of elasticity and short gel time.13 cl, 1 tbl, 18 ex

Thermoplastic elastomer composition // 2570045
FIELD: chemistry.SUBSTANCE: invention relates to thermoplastic elastomer composition for sealing layer of pneumatic tyre. Thermoplastic elastomer composition contains (A) 100 wt pt of halogenated copoly(isoolefin-p-alkylstyrene) caoutchouc, (B) from 40 to 120 wt pt of polyamide resin and (C) from 0.5 to 10 wt pt of amine, containing, at least, one hydroxyl group. Amine (C) represents compound, described by formula (1): where R1 represents C1-30alkyl; R2 represents -(C2H4O)n-H, where n represents integer number in the range from 1 to 30; and R3 represents -(C2H4O)m-H, where m represents integer number in the range from 1 to 30, C1-30alkyl or hydrogen.EFFECT: invention makes it possible to improve fatigue life.11 cl, 3 tbl
Thermoplastic elastomers and vulcanisates based on ethylene and vinyl alcohol copolymers // 2570023
FIELD: chemistry.SUBSTANCE: invention relates to thermoplastic elastomers and thermoplastic vulcanisates which are suitable for air-tight application. The thermoplastic vulcanisate contains a thermoplastic resin containing an ethylene and vinyl alcohol copolymer (EVOH), cured rubber dispersed therein and an EVOH-rubber compatibiliser. The cured rubber is selected from a group which includes: butyl rubber, halobutyl rubber, isobutylene and p-methyl styrene copolymer-based rubber and mixtures thereof.EFFECT: invention improves barrier and mechanical properties of thermoplastic vulcanisates.15 cl, 5 tbl

Phosphonium ionomers containing vinyl side groups and methods for production thereof // 2567387
FIELD: chemistry.SUBSTANCE: invention relates to an ionomer, a method of producing an ionomer and a method of producing a vulcanised polymer. The ionomer contains a reaction product of halogenated isoolefin copolymer and at least one phosphorus-based nucleophile containing at least one vinyl side group.EFFECT: obtaining self-vulcanising or peroxide-vulcanised ionomer compositions which do not require high content of multi-olefins.44 cl, 15 tbl, 71 ex
Water dispersion of polymers // 2557624
FIELD: chemistry.SUBSTANCE: invention refers to a method for producing a water dispersion of polymers applicable as colour and coating blends for food and beverage metal containers. A method for producing an aqueous dispersion of polymers involves the stages: i) preparing a mixture of the first and second polymers, each of which has a viscosity of more than 30 Pa·s at 100 s-1 measured at 100°C, with the blend containing: a) 1 to 60 weight portions of the first polymer immiscible in the water medium, and optionally containing reactive groups, and b) 40 to 99 weight portions of the second polymer containing dispersing groups with the polymer being miscible in the water medium and additionally containing groups reactive to the groups of the first polymer; ii) melting the polymers at a pre-set temperature in the high shift medium in an extruder to form a homogenous polymer system; iii) optionally carrying out a reaction of the reactive groups of the first and second polymer to each other in the high shift medium in an extruder to form a reacted blend; iv) chilling the melted blend from stage ii) or stage iii) out of the extruder to form a solid product, wherein a chilling rate makes at least 50°C/minute; v) optionally milling the solid product in smaller pieces; vi) contacting the solid product with the water medium, wherein the water medium dissolves the second polymer, but not the first polymer to produce a dispersion containing microparticles of the first polymer in the water solution of the second polymer. The invention also refers to a dispersion of polymer particles produced by the method described above, to a coating composition containing the dispersion according to the invention.EFFECT: coatings possess improved flexibility and adhesion.16 cl, 6 tbl

Composition for preparing polymer matrix containing polydicyclopentadiene for producing composite, polydicyclopentadiene composite and method for producing it // 2544549
FIELD: chemistry.SUBSTANCE: composition for preparing a polymer matrix contains, wt %: polymeric modifier 0.5-20.0, radical initiator 0.1-4.0, polymer stabiliser 0.1-4.0, modifying additive 1.0-15.0, ruthenic catalyst of metathesis polymerisation of dicyclopentadiene 0.001-0.02 and dicyclopentadiene min. 98% purity - the rest. The polydicyclopentadiene composite contains carbon-containing inorganic filler, organic-silicone modifier and polymer matrix described above in the preset mixture ratio. The composite is produced by preparing the polymer matrix by mixing dicyclopentadiene with polymer stabiliser and modifier, heating the prepared mixture to temperature 60-180°C and keeping the mixture at the given temperature for 2-360 min. After the mixture is cooled to 0-50°C, mixed with radical initiator, modifying additive and catalyst and agitated, the produced matrix is combined with reinforcing carbon-containing inorganic filler pre-treated with organic-silicone modifier. The polymerisation represents heated in a mould to 120-300°C and keeping at the above temperature for 1-300 min.EFFECT: improving characteristics of the polydicyclopentadiene and reinforcing carbon composites reflected by increasing bending and tensile strength and elastic modulus, and ease of manufacturing ensured by using thermally activated carbene complexes of rhutenium.6 cl, 39 ex

ethod for producing cross-linked compositions of polymer and bitumen with using no linking agents // 2544546
FIELD: chemistry.SUBSTANCE: invention refers to a method for producing cross-linked compositions of a polymer and bitumen with using no linking agent. The method for preparing the cross-linked compositions of the polymer and bitumen with using no linking agent provides at least one bitumen and at least one polymer composition containing at least 80 wt % of the polymer composition weight, diblock copolymer of monovinylaromatic hydrocarbon block and linked diene block having a molecular weight of 80000 g/mole or more and containing double-bond links in position 1-2 originating from the linked diene of 1.5% or more of the total weight of the linked diene links come in contact at 180°C to 220°C for a period of time of 8 h to 48 h. There are also declared versions of the method, versions of the cross-linked compositions of the polymer and bitumen, the method for producing the cross-linked stock solution with using no linking agent, and the cross-linked stock solution.EFFECT: producing the cross-linked compositions of the polymer and bitumen possessing the equivalent or improved properties as compared to the compositions containing the linking agent.25 cl, 3 tbl, 6 ex

ethod of producing crosslinked gel // 2540667
FIELD: chemistry.SUBSTANCE: invention relates to a novel method of producing hydrogels based on a crosslinked polymer, particularly obtained from polysaccharide or from one salt thereof. The method of producing crosslinked gel includes at least a step of: a) obtaining an aqueous medium containing at least one polysaccharide, b) forming a homogeneous gel from the medium obtained at step (a), c) bringing the gel obtained at step (b) into contact with an effective amount of at least one crosslinking agent, d) crosslinking said mixture formed at step (c), and e) extracting said crosslinked hydrogel. At least said steps (a) to (d) are carried out in a sealed chamber, bounded at least in part by a deformable wall, wherein said mixture in the chamber undergoes step (d) at conditions which facilitate crosslinking.EFFECT: method improves homogenisation of the polymer before crosslinking and improves the correct progression of the crosslinking process.19 cl, 7 dwg, 3 tbl, 3 ex

Polymer composition for cross-linked products // 2539571
FIELD: chemistry.SUBSTANCE: invention relates to method of obtaining cross-linked product. Method includes stage of polyethylene polymerisation, optionally, with one or more alpha-olefin comonomer(s) in presence of Ziegler-Natta catalyst, formation of product from said polymer and its further cross-linking. Ethylene polymer, obtained at the stage of polymerisation, contains double bonds carbon-carbon/1000 of carbon atoms in the range from more than 0.2 to fewer than 5.0 double bonds, is characterised by molecular-weight distribution (MWD) in the range from 3.3 to 15 and does not contain long-chain branches. Said polymer is selected from rubbers (POE), thermoplasts (POP) or very low density polyethylenes (ethylene copolymers) (VLDPE), which have range of density from 855 to 909 kg/m3, or linear low density polyethylenes (ethylene copolymers) (LLDPE) with density from 910 to 930 kg/m3, of middle density ethylene copolymers (MDRE) with density from 931 to 945 kg/m3.EFFECT: obtained cross-linked products have good mechanical properties, meeting high requirements and strict norms.9 cl, 4 tbl, 8 ex

Crosslinkable fluororubber composition and crosslinked rubber article // 2539009
FIELD: chemistry.SUBSTANCE: invention relates to a crosslinkable fluororubber composition which can yield a crosslinked rubber article, e.g., sealing material. A composition containing fluororubber and a compound of formula: (X-)x(Z-)zY, is crosslinked to form a crosslinked rubber article. In said formula, X denotes: U-(CF2)aO(CF2CF2O)b-, Z denotes: RFO(CF2CF2O)c-, Y denotes a (x+z) valent perfluoro saturated hydrocarbon group or a group having an ether oxygen atom embedded between carbon atoms thereof, x is an integer of at least 3, z is an integer of at least 0 and x+z is an integer of at least 3, U denotes a monovalent group having at least one element selected from a group consisting of an unsaturated hydrocarbon, a bromine atom and an iodine atom, RF denotes a C1-20 linear perfluoroalkyl group or a group having an ether oxygen atom embedded between carbon atoms thereof, a is an integer from 0 to 20, b is an integer from 1 to 200 and c is an integer from 3 to 200.EFFECT: crosslinked rubber article has excellent flexibility at low temperature.10 cl, 1 tbl, 6 ex

olecules, carrying groups capable of association // 2536867
FIELD: chemistry.SUBSTANCE: invention relates to compounds, containing, at least, one group Q and, at least, one group A, bound to each other with "spacer" group Sp, and which can be used as coupling agents, capable of establishing interaction between polymer and filler. In said compounds Q represents nitryl oxide or nitronic group of formula (VII) or (VIII), in which R1-R4 are selected from hydrogen atom, C6 aryl and group of formula (X), in which n stands for 1, 2, 3, 4 or 5, and each Y represents independently spacer group Sp or C1-C5 alkyl, A corresponds to formula (II), where X stands for oxygen atom, Sp represents C1-C5 alkyl chain, optionally interrupted with one or several nitrogen or oxygen atoms, which forms bond between Q and A.EFFECT: obtaining novel compounds.3 cl, 12 tbl, 4 ex

Inhibitor of foam polyurethane scorching // 2535853
FIELD: chemistry.SUBSTANCE: foam polyurethane composition includes polyol and a composition of a scorching inhibitor, containing derivatives of phenol compounds, aromatic amines, hydroquinone, selected from 2,5-di-tert-amylhydroquinone and di-tert-butylhydroquinone, and phenothiazine.EFFECT: invention makes it possible to efficiently inhibit scorching of foam polyurethanes and improve properties of the finished product.6 cl, 3 tbl

Production of dynamically cured mixes // 2534364
FIELD: process engineering.SUBSTANCE: invention relates to dynamically cure mixes that can be used for tire production. Production of said mix including at least one isobutylene-bearing elastomer and at least one thermosetting resin is carried out in several steps. At step (a) said thermosetting resin is mixed with at least one plasticiser in the first melt processing device to get a resinous mother mix. At step (b) said mix is pelletised prior to feeding it in the melt treatment second device intake. At step (c) said elastomer, at least one curing agent and resinous mother mix are fed into intake of the melt second treatment device. At step (d) said content of melt processing second device under conditions of dynamic curing to make dynamically vulcanised mix. In the latter, elastomer exists as a disperse phase of fine cured or partially cured particles in disperse phase of thermosetting resin.EFFECT: good impermeability and resilience at low temperatures.17 cl, 2 dwg, 4 tbl

Processing aid for thermoplastic polyurethanes // 2520441
FIELD: chemistry.SUBSTANCE: invention relates to a processing aid, which is used in processing of thermoplastic polyurethanes, as well as to its obtaining and application in processing of thermoplastic polyurethanes into self-supporting films. The processing aid contains, wt %: hydrophobised, at least, partly aggregated metal oxide particles of pyrogenic origin, selected from the group, including aluminium oxide, silicon dioxide and mixtures of the said metal oxides 10-50, one or several thermoplastic polyurethanes 20-75, one or several isocyanates 0.5-25, one or several compounds, possessing an action of anti-adhesive or dispersing auxiliary substances 0.5-15. Also described are: a method of obtaining the processing aid and a method of manufacturing the self-supporting film, which includes dosing into an extruder a mixture of thermoplastic polyurethane and the processing aid, used in an amount from 0.5 to 35 wt % counted per the total amount of thermoplastic polyurethane, mixture melting and extrusion through a head for film extrusion with obtaining the film.EFFECT: simplification of processing of thermoplastic polyurethanes, provision of maximally homogeneous mixing of thermoplastic polyurethane with liquid or viscofluid compounds, containing isocyanate groups.6 cl, 2 tbl, 7 ex

Films based on cross-linked polymers and articles made therefrom // 2520209
FIELD: chemistry.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
ethod of making rubber-polymer articles // 2513855
FIELD: chemistry.SUBSTANCE: invention relates to chemical industry and specifically to a method of making rubber-polymer articles designed for facing different surfaces and structures exposed to a constant load and wearing. The method of making rubber-polymer articles involves producing thermoplastic via combined thermal treatment of rubber and polyethylene and moulding. A mixture of polyethylene and rubber in amount of 35-45% and 55-65%, respectively, is used, the surface of which, during mixing, is treated with butyl alcohol in amount of 0-2.5% of the amount of the mixture. The mixture is then heated step by step while constantly stirring for 10 minutes at 240-250°C, then for 20 minutes to 235°C and then for 10 minutes to 220-235°C. The hot mixture is then used to mould articles in 3-5 minutes at pressure of 120-140 kg/cm2, and the moulded articles are then cooled. Low-pressure polyethylene in granules is used. The rubber can be used in form of industrial rubber wastes.EFFECT: invention enables to make articles of the required configuration with improved strength and friction characteristics.5 cl, 3 tbl

Processable filled vulcanisable halogenated isoolefin elastomers // 2502756
FIELD: chemistry.SUBSTANCE: composition contains a halogenated C4-C7 isoolefin copolymer and 3-20 wt % alkylstyrene containing 0.2-2 mol % haloalkylstyrene, having Mooney viscosity of 15-26, number-average molecular weight less than 270000, weight-average molecular weight less than 470000, z - average molecular weight less than 700000 and branching index (g') from 0.4 to 1.1. In the elastomer composition, the isoolefin can contain isobutylene, alkylstyrene can contain p-methylstyrene and the halogen is bromine. A vulcanised filled rubber article is made.EFFECT: improved processability of the crude filled rubber mixture, viscosity, relaxation, pre-treatment strength and other physical properties, improved permeability properties of tyre tubes and encasings.18 cl, 1 tbl
ethod of producing thermoplastic elastomer composition // 2497844
FIELD: chemistry.SUBSTANCE: invention relates to a method of producing a thermoplastic elastomer composition based on polyethylene and chlorosulphonated polyethylene for making various elastic industrial rubber articles by extrusion, pressure moulding and blow moulding. The method is realised by dynamic mixing of polyethylene with chlorosulphonated polyethylene in the presence of a vulcanising system which contains magnesium oxide, a mixture of organic acids and a mixture of sulphur vulcanisation accelerators of a group of thiazoles. At the step of dynamic mixing of polymers, magnesium oxide is added first, followed addition of a mixture of organic acids in a combination with a mixture of sulphur vulcanisation accelerators to carry out dynamic vulcanisation.EFFECT: composition obtained using the invention has high resistance to aggressive media, oil and petrol resistance and frost resistance, while maintaining resistance to ozone and the atmosphere.3 cl, 2 tbl, 7 ex

Epoxy resins and composite materials exhibiting improved combustion properties // 2494126
FIELD: chemistry.SUBSTANCE: invention relates to epoxy resin-based composite materials. The epoxy resin-based composition contains: a) 50-70 wt % of a component which is an epoxy resin containing one or more epoxy resins; b) 15-35 wt % of a mixture of thermoplastic materials containing polyetherimide and polyamideimide, where the weight ratio of polyetherimide to polyamideimide ranges from 5:1 to 1:5; and c) 5-25 wt % of a component which is a curing agent, where the epoxy resin composition has sulphur dioxide release level below 100 ppm. Also disclosed is a method of preparing a composition, a component made from an uncured composite, a component made from the composite, where a matrix of the epoxy resin is cured, and a method of producing a prepreg.EFFECT: composite materials can be used to make primary structures in aircraft and other load-bearing structures, characterised by good self-extinguishing time.21 cl, 2 dwg,18 ex

Butyl rubber-based mixtures containing three-component mixed modifier system // 2485148
FIELD: chemistry.SUBSTANCE: invention relates to rubber mixtures which are especially suitable for tyre treads. The rubber moulding composition for making tyre treads contains a halobutyl elastomer, at least one additional elastomer, mineral filler and at least a three-component mixed system of modifiers which contains silane, phosphine and an additive which contains at least one hydroxyl group and a functional group which contains a basic amine, the modified being added in an amount which provides a) ultimate elongation of samples of at least about 300%; b) tangent δ at 0°C greater than 0.36; c) tangent δ at 60°C less than 0.120; d) abrasion volume loss (DIN) less than 165 mm3; e) breaking strength greater than 13.0 MPa. A method of preparing said mixtures is also disclosed.EFFECT: mixtures are especially suitable for tyre treads and exhibit improved processing characteristics, traction force, rolling resistance and wear resistance.16 cl, 6 dwg, 48 ex
ethod of producing rubber mix // 2482962
FIELD: process engineering.SUBSTANCE: invention relates to non-polluting method of producing rubber mix to be used in production of tires and general mechanical rubber goods. Proposed method comprises preliminary multistep processing of one or several ingredients selected from curing activator and cross-linking accelerator by ledges of the disc or discs inside percussion-type activator at 1000-10000 rpm. Then, they are added to the mix by appropriate mixers.EFFECT: increased induction period at curing rate in primary period, late overcure, lower curing temperature, hence, lower costs.19 ex

Reactive mixture for coating moulded articles by reaction injection moulding and coated moulded articles // 2482145
FIELD: chemistry.SUBSTANCE: invention relates to a reactive mixture for coating moulded articles by reaction injection moulding. The reactive mixture contains at least 60 wt % (meth)acrylates with at least two double bonds, wherein content of at least one (meth)acrylate with three or more double bonds is at least 25 wt % of the weight of the reactive mixture. The reactive mixture contains at least one photoinitiator and at least one thermal initiator. Furthermore, the present invention describes a moulded article with a coating of the reactive mixture and a method for production thereof. The moulded article is obtained by reaction injection moulding and the moulded article contains at least one polymer selected from a group comprising polymethyl methacrylate, polymethacryl methylimide, a copolymer of styrene and acrylonitrile, a copolymer of styrene and maleic acid and copolymers of polymethyl methacrylate and a coating from the reactive mixture.EFFECT: formation of a fast solidifying coating with scratch resistance and high strength of adhesion with the moulded article.30 cl, 1 tbl, 19 ex

ethod of producing electroconductive elastomeric material // 2472813
FIELD: chemistry.SUBSTANCE: method of producing electroconductive elastomeric composite material based on general or special-purpose rubber involves mixing 100 pts.wt rubber, 10-13 pts.wt vulcanising group, 20-25 pts.wt plasticiser, 10-25 pts.wt graphite and 25-60 pts.wt electroconductive technical carbon. Pressure curing is then carried out. After curing, the material is subjected to swelling in an organic solvent until achieving equilibrium swelling index and then held for 1 hour at 100-120°C after complete removal of solvent.EFFECT: disclosed material has high electroconductivity.2 tbl, 26 ex

Polyolefin composition reinforced with filler and pipe containing polyolefin composition // 2469235
FIELD: chemistry.SUBSTANCE: pipe is made from spatially cross-linked polyolefin composition which is obtained by cross-linking a polyolefin composition. The polyolefin composition contains a base resin which contains a cross-linkable olefin homo- or copolymer (A) which contains hydrolysable silicon-containing groups, and filler (B). The filler is selected from mineral glass filler, feldspar, barites and carbon fibres.EFFECT: disclosed pipe has significantly improved hardness and modulus of elasticity in tension.13 cl, 2 tbl

Thermoplastic vulcanisate, peroxide-cured thermoplastic vulcanisate and moulded article made therefrom // 2466159
FIELD: chemistry.SUBSTANCE: peroxide-cured thermoplastic vulcanisate contains thermoplastic and a non-halogenated elastomer. The thermoplastic is selected from a group comprising polypropylene, polyethylene, polystyrene, a copolymer of acrylonitrile, butadiene and styrene, allyl resins, a copolymer of ethylene and vinyl alcohol, fluoroplastic, polyacetals, polyacrylates, polyacrylonitriles, polyamides, polyimides, polycarbonates, polyesters, polethylene oxide, polypropylene oxide, polyethylene glycol, polypropylene glycol, polyvinylidene chloride and mixtures thereof. The non-halogenated elastomer contains repeating units obtained from isobutene and 3.5 mol % repeating units obtained from isoprene.EFFECT: disclosed thermoplastic vulcanisates can be used when producing moulded articles for applications which require high degree of purity, reduced hygroscopicity and preventing decolouration of the article.20 cl, 2 dwg, 7 tbl, 18 ex

Liquid maleated butyl rubber // 2460738
FIELD: chemistry.SUBSTANCE: described is a liquid graft polymer obtained using a method which involves reaction of a polymer of a C4-C7 monoolefin monomer and a C4-C14 multiolefin monomer which contains butyl rubber, in the presence of a material for conducting graft copolymerisation, which contains maleic anhydride, and a free-radical polymerisation initiator which contains an organic peroxide, wherein the liquid graft polymer has number-average molecular weight (Mn) from 150000 to 30000. Described is a vulcanised compound containing the described liquid graft polymer and a vulcanising agent based on a multi-functional amine. Described is a method of decomposing a non-liquid butyl polymer to a liquid butyl graft polymer, where the method involves reaction of a non-liquid butyl polymer of a C4-C7 monoolefin monomer and a C4-C14 multiolefin monomer which contains butyl rubber, in the presence of a material for conducting graft copolymerisation, which contains maleic anhydride, and a free-radical polymerisation initiator containing dicumyl peroxide, wherein the liquid graft polymer has number-average molecular weight (Mn) from 150000 to 30000.EFFECT: liquid maleated butyl rubber is obtained.16 cl, 2 tbl, 2 dwg, 10 ex

Particle containing matrix and radical initiator // 2458081
FIELD: chemistry.SUBSTANCE: invention pertains to a particle comprising a composition containing a matrix and a peroxide or azo radical initiator, as well as rubber-coated products, tyres, tyre treads and belts containing particle-elastomer systems. The particle is selected from aramid, polyester, polyamide, cellulose fibre and glass fibre. The matrix is selected from an extruded polymer, wax or mixture thereof.EFFECT: invention improved mechanical properties - modulus of elasticity, hardness and wear-resistance.20 cl, 37 tbl, 7 ex

ethod for efficient mixing when producing thermoplastic elastomer composition // 2456311
FIELD: chemistry.SUBSTANCE: thermoplastic elastomer composition is obtained through dynamic vulcanisation in a high-shearing mixer at high temperature. The composition contains dispersed particles of a first halogenated elastomer containing isobutylene, and dispersed particles of a second elastomer having a functional group capable of reacting with a polyamide and being grafted onto the polyamide. Particles of the first and second elastomers are dispersed in a continuous thermoplastic polyamide matrix. The method involves dispersion of a curing agent in the halogenated elastomer and obtaining a pre-formed, preferably granulated composition. Polyamide resin and optional light stabilisers are then fed into the mixer. Shearing action is applied and heating is carried out to melt the polyamide and obtain a mixture. A polyamide plasticiser is then added to reduce viscosity of the polyamide mixture. Granules of the pre-formed elastomer composition are then fed into the mixer and heating and shearing action is then applied. The second elastomer is fed and heating and shearing action is continued in order to disperse the second elastomer. After dynamic vulcanisation, the thermoplastic elastomer composition is discharged from the mixer.EFFECT: invention enables to obtain improved impermeability characteristics for gases and fluid media, strength and longevity.20 cl, 9 tbl
 
2551086.
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