Stabilized polyvalent initiators for anionic polymerization and methods for preparation of these initiators

FIELD: chemistry.

SUBSTANCE: invention relates to stabilized solutions of polyvalent anionic polymerization initiators, and methods for continuous production of polydienes or polydiene copolymers. The stabilized anionic polymerization initiator solution composition contains: i. extended chain initiator defined by the formula wherein SOL is a bivalent solubilizing component, x is an integer of 1 or more, Q represents (a) a member selected from the group consisting of O, S, N, P and Si, or (b) a multivalent organic group, and R1, R2, R3 and R4 independently represent a monovalent organic group or R1 is connected to R2 to form a trivalent organic group and/or R3 is connected to R4 to form a trivalent organic group, or an extended chain initiator defined by formula

wherein each SOL independently represents a divalent solubilising component, x is an integer of 1 or more and R14, R15 and R16 each independently represent a divalent organic group; and ii. aliphatic solvent, cycloaliphatic solvent or a mixture of these solvents. A method for continuous production of polydienes or polydiene copolymers include: i continuous supply of a conjugated diene monomer into the reactor, optionally together with a monomer copolymerizable with the said diene monomer; and ii. continuous supply of a stabilized solution of the elongated chain initiator into the reactor.

EFFECT: obtaining of multivalent lithiated initiators, stable in aliphatic or cycloaliphatic solvents and remaining stable during polymerization, including continuous polymerization and polymerization conducted at elevated temperatures.

20 cl, 5 tbl, 6 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to a modifier, a method of obtaining a modified polymer and the modified polymer of a conjugated diene. The modifier for the polymer of the conjugated diene is obtained as a result of the complete condensation for a silicon-containing compound, which has a protected primary amino group and hydrolysable groups. The method of obtaining the modified polymer based on the conjugated diene includes a stage of modification and stage of the protection withdrawal. The tage of the protection is carried out after the completion of modification, and the used polymer based on the conjugated diene is preferably such that 10% of its polymer chains possess live and pseudolive properties.

EFFECT: modified polymer based on the conjugated diene is characterised by an excellent ability of small heat release and resistance to abrasion, which is used in a caoutchouc composition for the pneumatic tread.

13 cl, 4 tbl, 23 ex

FIELD: chemistry.

SUBSTANCE: bitumen composition includes petroleum road bitumen BND 90/130, SKS-30ARKM-15 or SKS-30ARK rubber and polyethylene polyamine production wastes as an adhesive additive, with the following ratio of components, wt %: BND 90/130 bitumen - 83-93, SKS-30ARKM-15 rubber - 5-10 and polyethylene polyamine production wastes - 2-7 or BND 90/130 bitumen - 86-95, SKS-30ARK rubber - 3-7 and polyethylene polyamine production wastes - 2-7. The method of producing the bitumen composition is carried out by mixing bitumen while heating with a rubber-containing component and an adhesive additive, wherein the rubber is added in the form of 8-12% solution in an organic solvent, wherein the solvent used is hydrocarbons with final boiling point of no higher than 130°C. Preparation of the rubber solution in the solvent is carried out at 40-50°C while mixing for 5-6 hours. The obtained rubber solution and adhesive additive are then added to the bitumen. The mixture is homogenised for 3-4 hours while gradually raising temperature to 160-170°C. Further mixing is carried out until achieving 97% removal of the solvent. The remaining amount of solvent is removed by blowing with nitrogen.

EFFECT: obtaining a homogenous bitumen binder, having improved physical and mechanical properties.

4 cl, 2 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to production of moulded articles containing polybutadiene and can be used in tire production as moulded strips for tire sidewalls or treads. Polybutadiene with content of cis-isomer over 95% and polydispersity lower than 2.5 is mixed with highly dispersed silicic acid and/or carbon black and with cross-linking agents, sulphur or sulphur donors, extra process additive and subjected to extrusion at 40-75°C.

EFFECT: higher quality of processing the mixes and quality of formed articles with lower rolling resistance and abrasion.

5 cl, 1 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to silane-containing caoutchouc mixtures with functionalised diene caoutchoucs and microgels, to method of their obtaining and application in automobile tyres. Caoutchouc mixture, containing caoutchouc, functionalised with hydroxyl, and/or carboxyl groups, and/or their salts, contains caoutchouc from repeating units based on 1,3-butadiene and styrene and silane of the given formula. Caoutchouc mixture can contain styrene-butadiene gel with index of swelling in toluene 1-25 and size particle from 5 to 1000 nm.

EFFECT: invention makes it possible to obtain resistant to wet sliding and possessing low rolling resistance - resistance in the process of steering of automobile tyre-treads with high wear-resistance.

9 cl, 4 tbl

FIELD: chemistry.

SUBSTANCE: method of producing conjugated diene rubber includes: (a) a step of reacting a first alkoxysilane compound whose molecule contains a group which can be converted to an onium ion by an onium ion generator, and an alkoxysilyl group which contains two alkoxy groups with a conjugated diene polymer which contains an active terminal atom of an alkali metal or an alkali-earth metal. The polymer is obtained by polymerising a conjugated diene compound and an aromatic vinyl compound to obtain a modified conjugated diene polymer which contains a group which can be converted to an onium ion, and an alkoxysilyl group, and (b) a step of mixing the obtained modified conjugated diene polymer with an onium ion generator and a second alkoxysilane compound whose molecule contains one alkoxysilyl group and one group which can be converted to an onium ion by an onium ion generator. The groups, which can be converted to an onium ion, in the first alkoxysilane and second alkoxysilane compounds are selected from a group of compounds.

EFFECT: reduced hysteresis loss and fuel efficiency in motor tyres.

7 cl, 4 tbl, 25 ex

FIELD: chemistry.

SUBSTANCE: anticorrosive coating composition contains DST-30-01 thermoplastic butadiene-styrene, an oligomer and a solvent, wherein the oligomer used is triethylene glycol dimethacrylate, the solvent used is toluene, and the composition further includes a photoinitiator - 2,2-dimethoxy-1,2-(diphenyl)ethanone.

EFFECT: faster preparation of the coating composition and direct formation of an anticorrosive coating.

2 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: rubber mixture based on butadiene-methyl styrene caoutchouc includes sulphur, diphenylguanidine, sulfene amide C, technical carbon, zinc oxide, stearic acid, as preservative and modifier of 2-(dimethylaminomethyl)-4-methyl-6-(1,7,7-trimethylbicyclo[2.2.1]hept-exo-2-yl)phenol 2-4 wt.p. per 100 wt.p. of caoutchouc.

EFFECT: invention makes it possible to increase confection adhesiveness with preservation of high stability to ageing of rubber mixture vulcanisate.

3 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to petrochemical industry, particularly production of butadiene-styrene rubber obtained by emulsion copolymerisation, and methods for filling thereof at a latex step, and can be used in producing industrial rubber articles. The method of producing filled butadiene-styrene rubber involves emulsion copolymerisation of butadiene with styrene in the presence of radical initiators, stoppering the process, degassing, adding an antioxidant and fibre filler - cotton, viscose, capron fibre or a mixture thereof, separating rubber from latex by coagulation in the presence of a coagulation agent and 2% sulphuric acid solution, washing and drying rubber crumbs. The fibre filler is used at the coagulation step in the composition of a compound coagulation agent consisting of 5-30% aluminium chloride solution, added in amount of 2.0-3.0 kg/t rubber, and fibre filler added in amount of 1.0-10.0 kg/t rubber.

EFFECT: method increases process efficiency, intensifies the rubber drying process, reduces consumption of the coagulation agent, stabilises the process of separating rubber from latex and reduces environmental pollution with products of producing rubber by emulsion copolymerisation.

1 tbl, 10 ex

FIELD: chemistry.

SUBSTANCE: invention relates to the rubber industry and can be used in making industrial rubber articles. The butadiene-methylstyrene rubber based rubber mixture contains sulphur, diphenyl guanidine, a vulcanisation accelerator, technical carbon, zinc oxide, stearic acid, an anti-ageing agent and a modifier. The vulcanisation accelerator used is sulphenamide Ts, the anti-ageing agent and modifier are 2-(dibutylaminomethyl)-4-methyl-6-(1,7,7-trimethylbicyclo[2.2.1]hept-exo-2-yl)phenol.

EFFECT: high building tack while maintaining high ageing resistance of the butadiene-methylstyrene rubber based rubber mixture.

3 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to rubber industry and can be used in making wear-resistant rubber articles for construction purposes, operating in conditions of intense wear, low temperatures and aggressive media. The oil-and-petrol resistant rubber mixture contains butadiene-nitrile rubber BNKS-40AMN, isoprene rubber SKI-3, methyl styrene rubber SKMS-30 ARKM-15, sulphur, sulphenamide Ts, stearine, technical carbon P324, zinc oxide, regenerate RShT, thiuram D, kaolin, petroleum bitumen, naphtham-2, oil I-8A, N-nitrosodiphenylamine, and process additives - dispractol KS and a mixture of diphenyl carbonate and dimethyl carbonate resin DFK-1.

EFFECT: invention reduces the cost of the rubber mixture owing to use of cheaper process additives, and increases nominal tensile strength and breaking elongation, and reduces the abrasion index.

2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to chemical engineering for producing sealants and filling compounds and is intended for use in producing piezoceramic devices, particularly when producing ultrasonic transmitting-receiving modules for contactless fuel level sensors. The polymer composition includes epoxy diane resin, epoxy aliphatic resin, filling agents, an amine curing agent, modifying additives - cyclohexanol and a mixture of 2,4- and 2,6-isomers of toluene diisocyanate, and a filling agent. The filling agent in the composition is tungsten (VI) oxide and chromium (III) oxide. The polymer composition has high sound speed and acoustic impedance.

EFFECT: transmitting-receiving modules for fuel level sensors filled with the polymer composition have a high conversion coefficient and vibration resistance.

1 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: group of inventions relates to methods of producing semiconductor devices on a solid-state body using light-sensitive compositions, e.g., photoresist materials, containing diazo-compounds as light-sensitive substances, and particularly to methods of forming a positive photoresist mask, which can be used in microelectronics to produce articles using techniques which include a photolithography step. A method of forming a positive photoresist mask includes depositing a positive photoresist on a substrate, the photoresist containing novolac resin and an ortho-naphthoquinone diazide compound which is used as a light-sensitive component, drying, exposing and developing. Immediately before depositing the photoresist composition on the substrate, 1,3-dinitrobenzylidene urea, or 1,5-diphenylsemicarbazide, or N,N'-methylene-bisacrylamide is added in amount of 5-15% with respect to the amount of the ortho-naphthoquinone diazide compound.

EFFECT: improved quality of the edge of the photoresist mask and longer service life of the photoresist.

3 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: polymer composition contains a propylene and ethylene copolymer, a sterically hindered amine, a stabiliser and a Remafin dye concentrate. The sterically hindered amine is (N-beta-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate), and the stabiliser is di(4-methyl-2,6-ditertbutylphenyl)phosphorous acid, oligomeric diphenoxy-propylidene-phenyl ether of phenyl phosphonic acid and pentaerythryl-tetrakis-3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate.

EFFECT: disclosed composition enables to obtain nonwoven material with high elasticity, which is retained before and after exposure to ionising radiation.

2 tbl

FIELD: chemistry.

SUBSTANCE: present invention relates to production of foamed vinyl aromatic polymers. The method of producing granules of fire-resistant foamed vinyl aromatic polymers, which enable to obtain foamed articles by aqueous suspension polymerisation, which includes polymerisation of styrene or a mixture of styrene and up to 25 wt % α-methylstyrene in an aqueous suspension in the presence of a peroxide initiating system which is active at temperature above 80°C, a foaming agent which is added before, during or after polymerisation, and in the presence of an amide of basic formula (I) R1CONHCH2 - CH2NHCOR2 (I), where R1 and R2, identical or different, denote an (iso)alkyl radical CH3(CH2)n for n ranging from 10 to 20, preferably from 16 to 18; and a fire-retardant system which includes a bromated additive with bromine content of more than 30 wt %, wherein said fire-retardant system includes bromated aliphatic, cycloaliphatic, aromatic compounds with bromine content of more than 30 wt %. Described is a foamed composition in form of granules based on vinyl aromatic polymers, which enables to obtain low-density foamed articles with improved insulating capacity, said composition including: a) a matrix obtained by polymerisation of styrene or a mixture of styrene and up to 25 wt % α-methylstyrene; b) 1-10 wt %, calculated with respect to the polymer matrix (a), foamed agent; c) 0.1-3 wt %, calculated with respect to the polymer matrix (a), self-extinguishing bromated additive in form of bromated aliphatic, cycloaliphatic, aromatic compounds with bromine content of more than 30 wt %; d) 0-1 wt %, calculated with respect to the polymer matrix (a), substance having synergetic effect, containing at least one C-C or C-O-O-C heat labile bond; e) 5-5000 mln-1, calculated with respect to the polymer matrix (a), amide of basic formula (I), obtained using the aqueous suspension polymerisation method described above. Also described is a foamed article, having thermal conductivity ranging from 34 to 36 mW/mK at 17 g/l, obtained by foaming and sintering granules based on a vinyl aromatic polymer composition described above.

EFFECT: obtaining foamed articles with low density and improved insulation capacity, and also resistant to deformations caused by solar radiation.

10 cl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to rubber industry, particularly production of rubber mixtures used to make articles for various purposes, including packer elements (rubber sealers in oil or gas wells), used in production of packer and anchor equipment. The rubber mixture contains the following ingredients, pts.wt (per 100.00 pts.wt rubber): paraffinate butadiene-nitrile rubber BNKS-40 AMN 100.00, with weight content of acrylonitrile of up to 41%, dicumyl peroxide (Perkadox BC-FF) - 3.0-4.0, vulcanisation coagent Deltagran HVA 2 70 GT - 1.0-3.0, zinc oxide - 3.0-5.0, antioxidant Irganox 1010 - 2.0-3.0, oligoester acrylates TGM-3 - 6.0-10.0, active technical carbon H-220 - 50.0-70.0, technical carbon T-900 - 10.0-30.0, dispersant zincolet BB 222 1.0-3.0, anti-scorch Santogard PVI - 0.3-0.5.

EFFECT: invention improves physical and mechanical properties of the rubber mixture, processability thereof by high-pressure casting, with improved elastic-strength properties, high aggressive heat resistance and low relative compression set, operating capacity under high loads.

1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to aircraft engineering, mechanical engineering and specifically to light, impact resistant, non-flammable foam materials which can be used as structural and heat-insulation aggregates, as well as in making components of "unsinkable" structures with a low water- and fuel-absorption coefficient, for example, float level gauges of fuel tanks of engine units. Disclosed is a composition for producing foam plastic having the following chemical composition, pts.wt: phenol novolac resin 20-40, phenol resol resin 60-80, nitrile rubber 20-40, urotropin 3-10, foaming agent 15-20, aluminium nitrilotrimethylphosphonate fire retardant 3-10. The technical result is high impact viscosity and low fuel-absorption of the foam plastic.

EFFECT: use of the disclosed foam plastic increases reliability of aircraft engineering articles and widens the field of use of said foam plastic.

2 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: polyamide-based composition contains melamine cyanurate and novolac. The composition is suitable for moulding articles which are used in electrical and electronic connections such as circuit breakers, switches and connectors.

EFFECT: high stability of the size of articles.

6 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a bituminous composition for use in the field of bitumen, road construction and industry. The bituminous composition comprises a larger portion of at least one bitumen and a smaller portion of at least one chemical additive. The additive is an organogelling agent which creates a network of hydrogen bonds between gelling molecules of the organogel which have molar mass less than or equal to 2000 g·mol-1. Said agent includes at least one hydrogen bond donor group D, at least one hydrogen bond acceptor group A and at least one compatibility enhancing group C which makes the organogelling agent compatible with bitumen chemical compounds. Said agent makes up at least 0.1 wt % of the total weight of bitumen. The invention also relates to a method of producing and using these bituminous compositions in road construction, particularly in producing road binding substances, as well as in industry.

EFFECT: obtaining bitumens which are harder at application temperatures without increasing their viscosity in hot condition.

37 cl, 2 dwg, 14 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing an asphalt modifier composition, involving: obtaining a triblock copolymer via block copolymerisation of a vinyl aromatic hydrocarbon and a diene compound with conjugated double bonds as a result of anionic polymerisation using an organic anionic initiator in a reactor, having a hydrocarbon solvent, where the step of producing the block copolymer involves: formation of a vinyl aromatic block by feeding a vinyl aromatic hydrocarbon into a reactor, having a hydrocarbon solvent, and then feeding an organic anionic initiator; forming a diene block with conjugated double bonds, bonded to the end of the vinyl aromatic block, by feeding a diene compound with conjugated double bonds into the reactor; feeding a functional additive, selected from a group consisting of compounds of formula 1, into the reactor; and obtaining an asphalt modifier composition, including a block copolymer and a functional additive, by removing a hydrocarbon solvent, Formula 1 ; in formula 1, the sum n+m-m' is equal to 35, n is an integer from 1 to 5, each of m and m' is an integer equal to at least 1, and X is an ester group [-C(=O)O-]. The invention also relates to a method of producing the asphalt modifier composition and asphalt composition.

EFFECT: asphalt modifier composition dissolves fast in asphalt without significantly reducing softening temperature of asphalt, which enables to obtain a homogeneous asphalt composition and increase effectiveness of the asphalt composition.

17 cl, 1 tbl, 4 ex

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

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing a polymer, having at least one functional terminal group, and a liquid polymer dispersed therein. The invention also relates to a composition and a coating containing the obtained polymer product. The method involves: (a) producing a 'living' polymer, where production of said 'living' polymer is initiated based on an anionic mechanism, and said polymer contains a cation; (b) adding a functional initiator precursor of the formula FI-H, where H is hydrogen and FI is a functional group, said H terminates said 'living' polymer resulting in a liquid polymer, and FI and said cation form a functional initiator; (c) adding a monomer, where said functional initiator initiates anionic polymerisation of said monomer; and (d) terminating the polymerisation reaction initiated at step (c). Steps (a) through (c) may be conducted in a single reactor, allowing a liquid polymer to be dispersed in a functionalised polymer in a single polymerisation step.

EFFECT: liquid polymer does not have to be handled separately and processing efficiency is improved.

15 cl, 2 tbl, 7 ex

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