Tire Rubber Composition Comprising an Acetylacetonate Compound
Rubber composition which can be used in particular for the manufacture of s, comprising at least a diene elastomer, a reinforcing filler, a crosslinking system, between 0.2 and 10 phr of an antioxidant, such as a substituted para-phenylenediamine, and between 0.2 and 10 phr of chromium (III) acetylacetonate. This acetylacetonate compound makes it possible to advantageously reduce the consumption of antioxidant during the thermo-oxidizing ageing of the composition. Metal/rubber composite comprising such a composition and at least a metal reinforcing member. comprising such a composition or such a composite.
1 . A rubber composition, usable in particular in the manufacture of a tire, comprising at least a diene elastomer, a reinforcing filler, a crosslinking system, between 0.2 and 10 phr of an antioxidant and between 0.2 and 10 phr of chromium (III) acetylacetonate.
2 . The composition according to claim 1 , wherein the diene elastomer is chosen from the group consisting of polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers and the mixtures of these elastomers.
3 . The composition according to claim 1 , wherein the reinforcing filler is chosen from the group consisting of carbon black, inorganic fillers and the mixtures of such fillers.
4 . The composition according to claim 3 , wherein the reinforcing filler is chosen from the group consisting of carbon black, silica and the mixtures of such fillers.
5 . The composition according to claim 1 , wherein the level of reinforcing filler is between 30 and 150 phr.
6 . The composition according to claim 1 , wherein the crosslinking system is based on sulphur and on an accelerator.
7 . The composition according to claim 1 , wherein the level of chromium acetylacetonate is between 0.3 and 6 phr.
8 . The composition according to claim 7 , wherein the level of chromium acetylacetonate is within a range from 0.5 to 2.5 phr.
9 . The composition according to claim 1 , additionally comprising a cobalt salt.
10 . The composition according to claim 9 , wherein the cobalt salt is chosen from the group consisting of the abietates, acetylacetonates, tallates, naphthenates, resinates and the mixtures of these compounds.
11 . The composition according to claim 1 , wherein the antioxidant is chosen from the group consisting of substituted p-phenylenediamines, substituted diphenylamines, substituted triphenylamines, quinoline derivatives and the mixtures of such compounds.
12 . The composition according to claim 11 , wherein the antioxidant is chosen from the group consisting of substituted p-phenylenediamines and the mixtures of such diamines.
13 - 14 . (canceled)
15 . A tire comprising a composition according to claim 1 .
16 . The tire according to claim 15 , the composition being an external composition of the, that is to say which is in contact with the air or with an inflation gas.
17 . The tire according to claim 15 , the composition being an internal composition of the , that is to say which is not in contact with the air or with an inflation gas.
18 . (canceled)
19 . A metal/rubber composite comprising a rubber composition according to claim 1 and at least a metal reinforcing member.