Modified polymer of conjugated diene, rubber composition and tyre

FIELD: chemistry.

SUBSTANCE: modified polymer is obtained via polymerisation of a conjugated diene compound in the presence of a catalyst which contains a compound of a lanthanide rare-earth element in an organic solvent, followed by modification of the obtained polymer which contains an active organometallic centre with a modifier which contains a functional group capable of a substitution or addition reaction, wherein the degree of modification is not less than 15% and content of cis-1,4-links in the conjugated diene part, measured via Fourier-transform infrared spectroscopy satisfies the relationship (I): content of cis-1,4-links ≥98.00 (%)…(1), or the degree of modification is not less than 75% and content of cis-1,4-links in the conjugated diene part, measured via Fourier-transform infrared spectroscopy, satisfies the relationship (II): 94.00 (%) ≤content of cis-1,4-links <98.00 (%)…(II).

EFFECT: modified polymer has high rate of modification, provides a rubber composition which contains a modified polymer of a conjugated diene, from which a tyre with low heat generation, satisfactory damage chacteristics and high wear-resistance is obtained.

32 cl, 1 dwg, 13 tbl, 29 ex

 

The text descriptions are given in facsimile form.

1. The modified polymer of a conjugated diene obtained by the polymerization of the conjugated diene compound in the presence of a catalyst containing a compound lantanoides rare earth element in an organic solvent, with subsequent modification of the obtained polymer containing active ORGANOMETALLIC centre, modifier, which contains a functional group capable of substitution reactions or re the options of joining with active ORGANOMETALLIC center of the polymer, while the degree of modification is not less than 15%, and the content of CIS-1,4-units of the dual diene area, measured using infrared spectroscopy with Fourier transform satisfies (I):
the content of CIS-1,4-units ≥for 98.00 (%), (I)
or the degree of modification is not less than 75% and a content of CIS-1,4-units of the dual diene area, measured using infrared spectroscopy with Fourier transform satisfies dependencies (II):
94,00 (%)≤ a content of CIS-1,4-links <for 98.00 (%), (II)
moreover, in the spectrum bandwidth determined by infrared spectroscopy with Fourier-transform, solution of the polymer of the conjugated diene in the carbon disulfide content of CIS-1,4-units, TRANS-1,4-units and vinyl units is determined from the following formula (XV), (XVI) and (XVII):
(content of CIS-1,4-units)=e/(e+f+g)·100 (%), (XV)
(the content of TRANS-1,4-units)=f/(e+f+g)·100 (%), (XVI)
(the content of vinyl units)=g/(e+f+g)·100 (%), (XVII)
where a is the maximum of about 1130 cm-1b - a minimum of about 967 cm-1; with at least about 911 cm-1; and d is at least approximately 736 cm-1in the spectrum, and e, f and g are from the following matrix (XIV):
[Equation 1]

moreover, in the spectrum, the maximum and 1130 cm-1represents the base line, at least about b 967 cm-1represents the content of TRANS-1,4-units, min is minimum with about 911 cm -1represents the content of vinyl units, and at least about d
736 cm-1represents the content of CIS-1,4-units.

2. The modified polymer of a conjugated diene according to claim 1, in which the modified polymer obtained by modifying a polymer having an active metal center, the degree of modification is not less than 40%, and the content of CIS-1,4-units of the dual diene area, measured using infrared spectroscopy with Fourier transform satisfies (I):
the content of CIS-1,4-units ≥for 98.00(%), (I)
or the degree of modification is not less than 75%, and the content of CIS-1,4-units of the dual diene area, measured using infrared spectroscopy with Fourier transform satisfies dependencies (II):
94,00 (%) ≤ a content of CIS-1,4-links <for 98.00 (%). (II)

3. The modified polymer of a conjugated diene according to claim 1 or 2, in which the modified polymer obtained by modifying a polymer having an active metal center, the degree of modification is not less than 40%, and the content of CIS-1,4-units of the dual diene area, measured using infrared spectroscopy with Fourier transform satisfies the relations (I) and (III):
the content of CIS-1,4-units ≥for 98.00(%), (I)
the content of vinyl units <0,75·(the content of the IP-1,4-links) -73,25(%), (III)
or the degree of modification is not less than 75%, and the content of CIS-1,4-units of the dual diene area, measured using infrared spectroscopy with Fourier transform satisfies dependencies (II):
94,00(%)≤ a content of CIS-1,4-links <for 98.00 (%). (II)

4. The modified polymer of a conjugated diene according to claim 1, in which the microstructure measured by infrared spectroscopy with Fourier transform satisfies the relations (I) and (IV):
the content of CIS-1,4-units ≥for 98.00(%), (I)
the content of vinyl units ≤0,35. (IV)

5. The modified polymer of a conjugated diene according to claim 1, in which the polymer having an active metal center, is a polymer with the active center.

6. The modified polymer of a conjugated diene according to claim 1, in which the polymer having the active organic center, interacts with the compound (modifier)containing a functional group capable of substitution or accession with the active ORGANOMETALLIC centre and not containing an active proton, which deactivates the active metal center, resulting in the functional group or associated molecular mass increases due to the binding.

7. The modified polymer of a conjugated diene according to claim 6, in which the modifier has at least one functional the second group, selected from the group consisting of azacyclopenta groups, ketone groups, carboxylic groups, dicarboxylic groups, carbonates, carboxylic anhydrides, metal salts of carboxylic acids, galoyanized, urea groups, timeonline group, aminogroup, diaminopropan, isocyanate group, thioisocyanate group, galitzianer, epoxypropyl, diepoxide, aminogroup, and the M-Z relationship (where M is Sn, Si, Ge or P, and Z is a halogen atom) and contains no active proton or oneway salt, which deactivates the active ORGANOMETALLIC center.

8. The modified polymer of a conjugated diene according to claim 6 or 7, in which the modifier is at least one compound (a)represented by the General formula (V):
[Chemical formula 1]

where each of X1-X3represents a monovalent functional group containing at least one selected from the group which contains a hydrogen or halogen atom, carbonyl group, thiocarbonyl group, isocyanate group, thioisocyanate group, epoxypropyl, diepoxide, golovljova group, hydrocarbonsoluble group and sulfonyloxy, and do not contain any active proton or oneway salt; X1-X5may be the same or different, provided that at least Odie is of X 1-X5is not a hydrogen atom; R1-R5independently represent a single bond or a divalent hydrocarbon group containing from 1 to 18 carbon atoms; and most aziridine rings can be contacted through any of the X1-X5and R1-R5.

9. The modified polymer of a conjugated diene according to claim 8, in which the compound (a) simultaneously satisfies that X1is a hydrogen atom and R1is a single bond in the General formula (V).

10. The modified polymer of a conjugated diene according to claim 1, in which the modifier is at least one selected from the group of the following compounds (b)-(h):
the compound (b): halogenated ORGANOMETALLIC compound, a halide compound or ORGANOMETALLIC compound represented by R6nM Z4-n, M Z4, M Z3, R7nM'(-R8-COOR9)4-nor R7nM'(-R8-COR9)4-nwhere R6-R8may be the same or different and each is a hydrocarbon group containing from 1 to 20 carbon atoms;
R5the hydrocarbon group containing from 1 to 20 carbon atoms and optionally containing carbonyl or ester group in the side chain;
M' is a tin atom, silicon, germanium or phosphorus;
Z is a halogen atom;
n - integer the number from 0 to 3;
connection (s): heterocumulenes compound containing the relationship Y=C=Y' (where Y represents an atom of carbon, oxygen, nitrogen, or sulfur; and Y' is an oxygen atom, nitrogen or sulfur in the molecule;
the compound (d): heterocyclic compound having a bond represented by General formula (VI);
[Chemical formula 2]

(where Y' is an oxygen atom or sulfur) in the molecule;
connection (s): galoisian connection;
connection (f): carboxylic acid, galoyanized, ester, ether, carbonic acid, or the acid anhydride represented by R10-(COOH)m, R11(COZ)m, R14-(COO-R15), R14-OCOO-R15, R16(OOCO-R17)mor the General formula (vii):
[Chemical formula 3]

(where R10-R18may be the same or different and each is
the hydrocarbon group containing from 1 to 50 carbon atoms; Z is a halogen atom, and m is an integer from 1 to 5),
compound (g): metal salt of carboxylic acid represented by R19kM(OCOR20)4-k, R21kM"(OCO-R22-COOR23)4-kor the General formula (VIII):
[Chemical formula 4]

(where R19-R25may be the same or different and each is a hydrocarbon group containing from 1 to 20 atoms of plastics technology : turning & is Yes; M" is a tin atom, silicon, or germanium; and k is an integer from 0 to 3); and
the compound (h): N-substituted aminoketones, N-substituted iminodiacetic, N-substituted aminoaldehyde, N-substituted aminodialkyl, or
the connection with the link(M represents an atom of oxygen or sulfur) in the molecule.

11. The modified polymer of a conjugated diene according to claim 1, in which the modifier (i) is at least one selected from gidrokarbalkoksilirovaniya compounds represented by the General formula (IX):
[Chemical formula 5]

where a1is a monovalent group having at least one functional group selected from the group containing (thio)epoxy resin, (thio)isocyanate, (thio)ketone, (thio)aldehyde, imine, amides, trihydrogen-isocyanurate esters, esters of (thio)carboxylic acid, salt, alkali metal salt or alkaline earth metal (thio)carboxylic acids, esters, carboxylic anhydrides, carboxylic halides, and digitocarpal carbonate esters;
R26is a single bond or a divalent inactive hydrocarbon group;
R27and R28independently represent a monovalent aliphatic hydrocarbon group having from 1 to 20 carbon atoms, or a monovalent aromatic hydrocarbon group having from 6 to 18 at the MOU carbon;
n is an integer from 0 to 2, if most OR28OR28may be the same or different; and an active proton, or onieva salt are not contained in the molecule and its partial condensates.

12. The modified polymer of a conjugated diene according to claim 11, in which the modifier (i) contains hydrocarbonsoluble the connection represented by the General formula (IX), and hydrocarbonsoluble the connection represented by the General formula (X):
[Chemical formula 6]

[where a2is a monovalent group containing at least one functional group selected from cyclic tertiary amines, acyclic tertiary amines, pyridine, sulfide, multislide, and NITRILES;
R29is a single bond or a divalent inactive hydrocarbon group;
R30and R31independently from each other represent a monovalent aliphatic hydrocarbon group having from 1 to 20 carbon atoms, or a monovalent aromatic hydrocarbon group having 6 to 18 carbon atoms;
m is an integer from 0 to 2; if the majority OR31OR31can be the same or different; and an active proton, or onieva salt does not contain the molecule] and/or a partial condensate.

13. The modified polymer of a conjugated diene according to claim 11, which is obtained by adding a promoter, obtained by polycondensation, during and/or after the first response modification gidrokarboksilirovanie compound modifier (i).

14. The modified polymer of a conjugated diene according to claim 11, in which, after the first reaction modification of the active end with gidrokarboksilirovanie compound I represented by the General formula (IX), the diene polymer further interacts with other gidrokarboksilirovanie compound II containing at least one selected from the group hydrocarbonsoluble compounds represented by the General formula (X), and/or its partial condensate and hydrocarbonsoluble the connection represented by the General formula (XI):
[Chemical formula 7]

[where a3is a monovalent group having at least one functional group selected from the group consisting of alcohols, thiols, primary amines and their onevia salts, cyclic secondary amines and their onevia salt, acyclic secondary amines and their onevia salt, onevia salt of cyclic tertiary amines, onevia salts acyclic tertiary amines, a group having allyl or benzyl-Sn connection, sulfonyl, sulfinil, and nitrile;
R32is a single bond or a divalent inactive hydrocarbon group, R33and R34independently represent a monovalent aliphatic the massive group of hydrocarbons, having from 1 to 20 carbon atoms, or a monovalent aromatic hydrocarbon group having 6 to 18 carbon atoms;
q is an integer from 0 to 2; and if a majority OR34, OR34can be the same or different], and/or a partial condensate in the presence of a promoter, obtained by polycondensation.

15. The modified polymer of a conjugated diene by 14 in which the promoter, obtained by polycondensation, contains water and at least one compound selected from the group consisting of metal compounds, are presented in the following paragraphs (1)-(3);
(1) a carboxylate of tin (II)having from 3 to 30 carbon atoms Sn(OCOR35)2,
[where each of R35is an organic group having 2 to 19 carbon atoms, and may be the same or different],
(2) connection of tin (IV)represented by the following formula:
Rr36SnA4tB1(4-t-r),
[where r is an integer from 1 to 3; t is an integer from 1 to 2; t+r is an integer 3 or 4;
R36- aliphatic hydrocarbon group having from 1 to 30 carbon atoms; In1is a hydroxyl group or a halogen atom;
And4- siloxane group, which is entirely three-replaced [1] a carboxyl group having 2 to 30 carbon atoms, [2] α,γ-dionyl group having 5 to 30 carbon atoms, [3] hydro is ambelokipoi, having 3 to 30 carbon atoms, and [4] hidrocarburos group having from 1 to 20 carbons, and/or hydrocarbonaceous having from 1 to 20 carbons (can be the same or different); when in the presence of the majority And4And4can be the same or different],
(3) the compound of titanium (IV)represented by the following formula:
And5xTiB2(4-x),
[where x is an integer 2 or 4; And5- [1] hydrocarbonaceous having from 3 to 30 carbon atoms, [2] celoxica, which is entirely three-substituted alkyl group having from 1 to 30 carbon atoms, and/or hydrocarbonaceous having from 1 to 20 carbons, if bolshinstvo5And5can be the same or different; and this α,γ-dionyl group having 5 to 30 carbon atoms].

16. The modified polymer of a conjugated diene according to claim 1, in which the modifier (j) is at least one compound selected from compounds of General formula (XII) or (XIII):
[Chemical formula 8]

where Z is a surrogate for exposure to or interaction with organic or inorganic filler; R37is a single bond or a divalent organic group; R38is a monovalent organic group or a divalent organic group that forms a cyclic org is practical group with R 39or R40; R39is a single bond, a divalent organic group or a trivalent organic group that forms a cyclic organic group with R39, R40or R41, R40is a monovalent organic group or a divalent organic group that forms a cyclic organic group with R38, R39or R40; and R41is a monovalent organic group or a divalent organic group that forms a cyclic organic group with R38, R39or R40with the proviso that each group is associated with kinoaparatom, bound through a carbon atom and R37, R38, R39, R40, R41and Z - Deputy, which is not protonium living polymer.

17. The modified polymer of a conjugated diene according to clause 16, where Z - N,N-disubstituted aminofilina group, aminogroup or a cyclic amino group.

18. The modified polymer of a conjugated diene according to clause 16, in which the modifier (j) contains dimethylamino, benzyliden ethylamine or diethylamine benzyliden butylamine; dimethylamino, benzylidene aniline, dimethylamine, benzyliden n-butylaniline, dimethylamino, benzyliden dodecylamine, dimethylamino, benzyliden methoxyaniline, dimethylamino, benzyliden dimethylamino aniline, bis(dimethylamino phenyl)metered the n-butylamine, bis(dimethylamino phenyl)methylidene n-octylamine, bis(diethylamino phenyl)methylidene butylamine, bis(diethylamino phenyl)methylidene n-octylamine, benzyliden dimethylamino aniline, methoxybenzylidene dimethylamino aniline, 1-methyl-4-penten-2-yl-methylidene dimethylaniline, 1,3-dimethylbutylamine dimethylaniline, or mixtures thereof; or phenylene bis (dimethyl amino, benzyliden Amin); benzylidene (1 hexamethylenimine)aniline, benzylidene (1-pyrrolidino)aniline, dimethylamine, benzylidene (1 hexamethylenimine)aniline, dimethylamine, benzylidene (1-pyrrolidino)aniline, (1 hexamethylenimine)benzylidene aniline, (1-pyrrolidino)benzylidene aniline, benzyliden ((4-n-butyl-1-piperazine derivatives)methyl)aniline, benzyliden ((3-(1-methyl)pyrrolidino)methyl)aniline, ((4-n-butyl-1-piperazine derivatives)methyl)benzylidene aniline, (3-(1-methylpyrrolidine)methyl)benzylidene aniline, or mixtures thereof.

19. The modified polymer of a conjugated diene according to claim 1, which is obtained by polymerization of a monomer containing conjugated diene at a temperature of 25°C in the presence of a catalytic system containing:
component (A): lantanoides rare-earth connection sequence number 57-71 in the Periodic table or a product of chemical reaction with a Lewis base,
component (C): organic compound of aluminum, presents AlR42R43R44where R42and R43may be the same or about licatesi, and each is a hydrocarbon group having from 1 to 10 carbon atoms, or hydrogen atom; R44the hydrocarbon group having from 1 to 10 carbon atoms; and R42can be the same or different from R43or R44and
component (C): at least one of a Lewis acid complex of halogen with a Lewis base and an organic compound containing active halogen.

20. The modified polymer of a conjugated diene according to claim 19, in which lantanoides rare earth compound in the component (A) is a neodymium salt, soluble in the hydrocarbon solvent.

21. The modified polymer of a conjugated diene according to claim 20, in which lantanoides rare earth compound in the component (A) is a neodymium branched carboxylate salt or the reaction product salt with a Lewis base.

22. The modified polymer of a conjugated diene according to claim 19, in which the catalytic system further comprises iluminacin as component (D).

23. The modified polymer of a conjugated diene according to article 22, in which the catalytic system is pre-prepared in the presence of components (A), (B), (C) and (D), and the conjugated diene.

24. The modified polymer of a conjugated diene according to claim 1, in which the ratio (Mw/Mn) srednevekovoi molecular weight (Mw) to number average forefront of the lar mass (MP) is in the range from 1.6 to 3.5.

25. The modified polymer of a conjugated diene according to claim 1, which contains from 80 to 100 percent by weight of Monomeric level of 1,3-butadiene and 20 to 0% by weight of another monomer level, copolymerisate with 1,3-butadiene.

26. The modified polymer of a conjugated diene by A.25, which contains Monomeric link 1,3-butadiene.

27. The modified polymer of a conjugated diene according to claim 1, in which srednevekovaja molecular weight (Mw) is within 100000-500000.

28. The modified polymer of a conjugated diene according to item 27, which srednesemennyh molecular weight (MP) is 150000-300000.

29. The rubber composition containing the modified polymer of a conjugated diene according to any one of claims 1 to 28 in number, at least 10 wt.% all rubber component, a filler and sulfur.

30. The rubber composition according to clause 29, which contains the filler in an amount of at least 10 parts by weight against 100 parts by weight of the rubber component.

31. The rubber composition according to clause 29 or 30, crosslinked by sulfur.

32. Bus containing at least one component of the tire is made of rubber composition according to any one of p-31.



 

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9 cl, 5 tbl, 11 ex

FIELD: chemistry.

SUBSTANCE: latex is obtained through emulsion polymerisation of a monomer of a conjugated diene compound. 50-95 pts. wt monomer of the conjugated diene compound from 100 pts. wt are added together with a molecular weight regulating agent to carry out a primary reaction. The remaining amount of monomer of the conjugated diene compound is added together with the molecular weight regulating agent to carry out a secondary reaction. The ratio of the monomer of conjugated diene compound to the molecular weight regulating agent used in the secondary reaction is higher than the ratio used in the primary reaction. The secondary reaction is longer than the primary reaction. The latex has average particle diametre of 1800-5000 E, coefficient of polymerisation conversion of at least 90% and average gel content of 70-95%. The thermoplastic resin is obtained through emulsion polymerisation of 45-75 pts. wt latex, 17-40 pts. wt aromatic vinyl compound and 4-20 pts. wt vinylcyanide compound for producing graft copolymer latex. The vinylcyanide compound is selected from a group consisting of acrylonitrile, methacrylonitrile and ethacrylonitrile. The graft copolymer latex is coagulated with a coagulant at 60-80°C and held at 80-99°C to obtain powdered graft copolymer. The obtained thermoplastic resin is used in form of a mixture of graft copolymer and styrene-acrylonitrile copolymer.

EFFECT: resin and latex have excellent resistance to impact loads, chemical resistance, processing properties, excellent lustre and whiteness.

15 cl, 1 tbl, 10 ex

FIELD: chemistry.

SUBSTANCE: invention relates to synthetic rubber industry, specifically to a method of breaking down homopolymers of diene rubber. The thermal oxidative breakdown method is realised in a hydrocarbon solvent medium while heating, under the effect of an oxygen-containing gas, in the presence of a breakdown agent. The breakdown agent used is an adduct of azodiisobutyronitrile with a heterocyclic carbonyl-containing compound, selected from γ-butyrolacton, α-pyrrolidone, N-methylpyrrolidone or caprolactam in ratio of 1:2-3 respectively, with 0.5-0.75 wt % content of adduct in the hydrocarbon solvent. The breakdown process is carried out at temperature 40≤t≤60°C.

EFFECT: reduced energy consumption and fire and explosion hazard of the method, and obtaining an end product which is suitable for repeated use during synthesis of basic rubber.

1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: method lies in interaction of rare-earth element oxide (REE) and dialkylphosphate acid in presence of inorganic REE salt in carbon dioxide solvent medium at temperature 50-90°C and molar ratio REE salt: REE oxide, equal 1:80-150. Rare-earth element dialkylphosphates can be separated in dry form or used without separation immediately after their synthesis n form of solution.

EFFECT: simplifying method of obtaining rare-earth element dialkylphosphates.

8 ex

FIELD: polymerization catalysts.

SUBSTANCE: invention provides rare-earth element carboxylate composition used as a part of catalytic system for polymerization of conjugated dienes and containing rare-earth element carboxylate and organic solvent, which composition is characterized by additionally containing oxyalkylenated C1-C20-alcohol with molecular mass 90 to 100000 or mixture of such oxyalkylenated alcohols. Described is also preparation of liquid rare-earth element carboxylate composition as well as conjugated diene polymerization process in presence of catalytic system to give polymer with high content of 1,4-cis units.

EFFECT: enabled preparation of stable composition suitable for preparation of stereospecific diene polymerization catalyst.

5 cl, 23 ex

FIELD: polymers, chemical technology.

SUBSTANCE: invention relates to a method for synthesis of copolymer used in rubber mixture and cross-linked with sulfur with reduced hysteresis in cross-linked state and comprising two blocks wherein one block consists of polyisoprene and another block consists of styrene-diene elastomer distinct from polyisoprene, and to a rubber mixture for tire protectors. Method for synthesis of copolymer involves co-polymerization of one or some monomers comprising coupled diene distinct from isoprene and by using catalytic system comprising at least one hydrocarbon solvent, metal compound A from the group IIIA, alkaline metal compound B and polymeric initiator C with a bond C-Li that consists of monolithiated polyisoprene designated for formation of polyisoprene block and wherein an average molecular mass Mn1 of indicated polyisoprene block is in the range between 2500 and 20000 g/mole. Method involves to preparing copolymer wherein another block consisting of indicated diene elastomer with an average molecular mass Mn2 between 65000 and 350000 g/mole and the content of trans-1,4-bonds is 70% or above. Invention provides reducing hysteresis of mixtures to limit consumption of fuel and to provide safety of environment.

EFFECT: improved method of synthesis.

22 cl, 5 tbl, 5 ex

FIELD: polymerization of conjugated dienes and copolymerization with vinyl aromatic copolymers by interaction in hydrocarbon solvent medium.

SUBSTANCE: proposed method is used for copolymerization with vinyl aromatic solvent of lithium alkyl and organic amine; used as organic amine is compound of the following formula:

, where R1 and R2 are similar or different; C1-C4 are alkyl or allylic radicals; R3 is vinyl or phenyl radical. Process is performed at temperature of 20-35°C at equimolar ratio of lithium alkyl: organic amine and concentration of lithium alkyl in solution from 0.1 to 1.0 mole/l; then, diene or vinyl aromatic monomer or their mixture is fed to reaction zone continuously or in batches to mole ratio of conjugated monomer: starting lithium alkyl no less than 3 at concentration maintained at 0.05 to 0.20 mole/l. Invention is also useful to nitrogen-containing initiating agent of the following formula:

.

EFFECT: enhanced ecological safety with no change in polymerization of structure and composition of (co)polymers of conjugated dienes.

3 cl, 1 tbl, 8 ex

The invention relates to a rubber containing both linear and branched molecular structure, and a modified rubber polymers monovinylacetylene

The invention relates to catalytic systems based on lanthanide for (co)polymerization of conjugated dienes

FIELD: chemistry.

SUBSTANCE: polymer, whose chain ends are modified, contains a product of reacting a living anionic elastomeric polymer and a silane sulphide modifier of formula: (RO)x(R)ySi-R'-S-SiR3. The invention also relates to a vulcanised composition based on the elastomeric polymer and a method of preparing said composition. The method involves combining filler, vulcanising agent, elastomeric polymer modified on chain ends and vulcanisation of the elastomeric polymer composition. The composition is used to make articles such as pneumatic tyres, tyre protectors, belts and suchlike.

EFFECT: preserving good technological properties and good balance of physical and mechanical properties, including wear resistance, breaking strength, apparent tensile stress and breaking elongation.

23 cl, 9 tbl, 19 ex

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