JPWO2020058604A5 - - Google Patents

Claims (10)

at least,
- diene elastomers,
- reinforcing fillers,
- a crosslinked system,
- 1 to 30 parts by weight of epoxy resin per 100 parts by weight of elastomer (phr),
- between 1 and 15 phr of an amine curing agent comprising at least two primary amine functional groups located on at least one six-membered aromatic ring, said at least one six-membered aromatic ring comprising
- at least one primary amine functional group, and - ethers, tertiary amines, thioethers substituted by linear or branched C1-C6 alkyl groups, halogens, linear or branched C1-C6 alkyl groups, At least two identical or different Ri groups selected from the group consisting of ketones, esters and amides are combined with hydrogen where said at least one 6-membered aromatic ring is ortho to said primary amine functional group. an amine curing agent, including to be free of atoms;
- imidazoles of general formula (A)

(In the formula,
- R _a represents a hydrogen atom or a hydrocarbon group optionally interrupted and/or substituted by one or more heteroatoms;
- R _b represents a hydrocarbon group,
- R _c and R _d independently of each other represent a hydrogen atom or a hydrocarbon group optionally interrupted and/or substituted by one or more heteroatoms;
- Alternatively, R _c and R _d may be interrupted and/or substituted by one or more heteroatoms together with the carbon atom of the imidazole ring to which they are attached. form a ring)
rubber composition based on. 2. The rubber composition of claim 1, wherein the diene elastomer is selected from the group consisting of polybutadiene, natural rubber, synthetic polyisoprene, butadiene copolymers, isoprene copolymers, and mixtures of these elastomers, preferentially isoprene elastomers. A rubber composition according to claim 1 or 2 , wherein the content of epoxy resin is between 10 and 25 phr, preferably between 10 and 20 phr. A rubber composition according to any one of the preceding claims , wherein the content of amine curing agent is in the range ranging from 5 to 10 phr, preferably from 2 to 8 phr. In the imidazole of general formula (A),
- R _a is a hydrogen atom, an optionally substituted alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 5 to 24 carbon atoms, or an aryl group having 6 to 30 carbon atoms; selected from the group consisting of groups, aralkyl groups having 7 to 25 carbon atoms,
- R _b is an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 5 to 24 carbon atoms, an aryl group having 6 to 30 carbon atoms, or 7 to 25 carbon atoms; is selected from the group consisting of aralkyl groups having
- R _c and R _d are a hydrogen atom, an optionally substituted alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 5 to 24 carbon atoms, or 6 to 30 carbon atoms; or aralkyl groups having 7 to 25 carbon atoms, or R _c and R _d together with the imidazole ring carbon atom to which they are attached are independently selected from the group consisting of to form a ring selected from aromatic, heteroaromatic or aliphatic rings containing 5 to 12 carbon atoms, preferably 5 or 6 carbon atoms. The rubber composition according to the item. In the imidazole of general formula (A), R _a is selected from the group consisting of optionally substituted alkyl groups having 2 to 12 carbon atoms and aralkyl groups having 7 to 13 carbon atoms. The rubber composition according to any one of claims 1 to 5 . A rubber composition according to any one of claims 1 to 6 , wherein the content of imidazole of general formula (A) is in the range extending from 0.1 to 5 phr. A rubber composition according to any preceding claim, wherein the content of reinforcing filler is in the range ranging from 20 to 200 phr, preferably from 30 to 150 phr. A final or semi-finished rubber article comprising the rubber composition according to any one of claims 1-8 . A tire comprising the rubber composition according to any one of claims 1 to 8 .