Reinforced rubber composition
A rubber composition is based on at least: a copolymer A, with a content of greater than or equal to 50 phr, said copolymer A being a copolymer based on at least one ethylene monomer and on at least one vinyl acetate monomer a reinforcing inorganic filler as agent for coupling between said copolymer A and said reinforcing inorganic filler, a copolymer B different from said copolymer A, said copolymer B being a copolymer based on at least one alpha-olefin monomer and on at least one functional monomer Y; and a peroxide crosslinking system. This composition is especially intended for the manufacture of semi-finished products for tires or for the manufacture of tires.
1. A rubber composition based on at least:
a copolymer A with a content of greater than or equal to 50 phr, the copolymer A being a copolymer based on at least one ethylene monomer and on at least one vinyl acetate monomer;
a reinforcing inorganic filler with a content greater than or equal to 20 phr, wherein the reinforcing inorganic filler is precipitated silica with a BET specific surface area and a CTAB specific surface area from 30 to 400 m 2 /g;
as agent for coupling between the copolymer A and the reinforcing inorganic filler, a copolymer B different from the copolymer A, the copolymer B being a copolymer based on at least one alpha-olefin monomer and on at least one functional monomer Y, wherein the at least one functional monomer Y of the copolymer B is selected from the group consisting of monomers bearing an epoxide function and monomers bearing a carboxylic acid function, and wherein a content of the copolymer B ranges from 5% to 30% by weight relative to a weight of the reinforcing inorganic filler;
a peroxide crosslinking system; and
a polymer C, different from the copolymer A and the copolymer B, wherein the polymer C is a diene elastomer having a molar content of diene units of less than 15%.
2. The rubber composition according to claim 1 , wherein the molar content of ethylene monomer in the copolymer A is greater than or equal to 51.
3. The rubber composition according to claim 1 , wherein the molar content of ethylene monomer in the copolymer A ranges from 57% to 90%.
4. The rubber composition according to claim 1 , wherein the molar percentage of the at least one functional monomer Y in the copolymer B is greater than or equal to 0.5%.
5. The rubber composition according to claim 1 , wherein the molar percentage of the at least one functional monomer Y in the copolymer B ranges from 0.7% to 10%.
6. The rubber composition according to claim 1 , wherein the at least one functional monomer Y of the copolymer B is a monomer bearing an epoxide function, the at least one functional monomer Y being selected from the group consisting of aliphatic glycidyl esters, aliphatic glycidyl ethers, alicyclic glycidyl esters and alicyclic glycidyl ethers.
7. The rubber composition according to claim 6 , wherein the at least one functional monomer Y of the copolymer B is glycidyl methacrylate or glycidyl acrylate.
8. The rubber composition according to claim 1 , wherein the alpha-olefin monomer of the copolymer B is ethylene.
9. The rubber composition according to claim 1 , wherein the content of the copolymer B ranges from 1 to 25 phr.
10. The rubber composition according to claim 1 , wherein the content of the copolymer B is greater than or equal to 5% by weight relative to the weight of the reinforcing inorganic filler.
11. A semi-finished article for a tire comprising at least one rubber composition according to claim 1 .
12. A tire comprising at least one rubber composition according to claim 1 .