Rubber compositions comprising an epoxide diene elastomer and a cross-linking system
A rubber composition contains: an elastomer matrix comprising at least one diene elastomer comprising epoxide functions, at least one reinforcing filler, and a system for crosslinking the polymer, comprising at least one organopolyphosphorus compound of general formula (I) in which A represents a covalent bond or a hydrocarbon group comprising at least 1 carbon atom, which is optionally substituted and which optionally comprises one or more heteroatoms, and the Rs represent, independently of one another, a hydrocarbon group comprising at least 1 carbon atom or a hydrogen atom.
1. A rubber composition containing at least:
an elastomer matrix comprising at least one diene elastomer comprising epoxide functions;
a reinforcing filler; and
a system for crosslinking the at least one diene elastomer, the system comprising at least one organopolyphosphorus compound of general formula (I)
in which:
A represents a covalent bond or a hydrocarbon group comprising at least 1 carbon atom, which is optionally substituted and which optionally comprises one or more heteroatoms, and
each R represents, independently of one another, a hydrocarbon group comprising at least 1 carbon atom or a hydrogen atom.
2. The rubber composition according to claim 1 , wherein A represents a covalent bond or a divalent hydrocarbon group comprising at least 1 and at most 1800 carbon atoms.
3. The rubber composition according to claim 1 , wherein A is a divalent hydrocarbon group of aliphatic type or a divalent hydrocarbon group of aromatic type, or a divalent group comprising at least one aliphatic part and one aromatic part.
4. The rubber composition according to claim 1 , wherein A comprises at least one heteroatom selected from oxygen, nitrogen and sulfur.
5. The rubber composition according to claim 1 , wherein A does not comprise any other phosphonic function.
6. The rubber composition according to claim 1 , wherein A is a divalent group of aliphatic type or a divalent group comprising at least one aliphatic part and one aromatic part, which group optionally comprises at least one oxygen atom.
7. The rubber composition according to claim 1 , wherein each R represents, independently of one another, a hydrogen atom or an alkyl group having from 1 to 20 carbon atoms, a cycloalkyl group having from 5 to 24 carbon atoms, an aryl group having from 6 to 30 carbon atoms or an aralkyl group having from 7 to 25 carbon atoms.
8. The rubber composition according to claim 1 , wherein each R is identical and represents a hydrogen atom or an alkyl group having from 1 to 12 carbon atoms.
9. The rubber composition according to claim 1 , wherein a content of the at least one organopolyphosphorus compound is at least 0.2 and at most 20 phr.
10. The rubber composition according to claim 1 , wherein the rubber composition is devoid of non-epoxidized diene elastomer.
11. A tire comprising the rubber composition according to claim 1 .