Rubber composition for the manufacture of tires which has a base of precipitated silicas "doped" with aluminum
AssigneeCompagnie Generale des Etablissements Michelin - Michelin & Cie
InventorRobert Vanel
Life of this patent
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Abstract
The object of the present invention is a rubber composition which is inted for the manufacture of tires and has a base of precipitated silicas "doped" with aluminum, the aluminum content being between .gtoreq.0.35% and .ltoreq.3% by weight of silica. Said composition has improved working properties as well as improved hysteresis properties.
Claims19
A sulfur vulcanizable rubber composition intended for the manufacture of tires, having a base of at least one diene polymer, characterized by the fact that it contains as reinforcing filler, a precipitated silica having an aluminum content of between 0.35% and 3% by weight (both inclusive), referred to the weight of the silica, prepared by reacting silicate with an acidifying agent to obtain a suspension of precipitated silica, performing a step selected from the group consisting of:
- (a) adding at least one compound A of aluminum and then a basic agent;
- and
- (b) adding a silicate and at least one compound A of aluminum simultaneously;
- and then separating the resulting suspension by filtration to provide a cake.
A method of improving the hysteresis properties of sulfur vulcanizable diene rubber compositions which are intended for the manufacture of tires comprising silica as reinforcing filler, characterized by the fact that it consists in reinforcing the compositions with a precipitated silica having an aluminum content of between 0.35% and 3% by weight (both inclusive), referenced to the weight of the silica, and in using it in the manner known per se, prepared by reacting silicate with an acidifying agent to obtain a suspension of precipitated silica, performing a step selected from the group consisting of:
- (a) adding at least one compound A of aluminum and then a basic agent;
- and
- (b) adding a silicate and at least one compound A of aluminum simultaneously;
- and subsequently separating the resulting suspension by filtration to provide a cake.
A method of reducing the content of coupling agent in sulfur vulcanizable diene rubber compositions intended for the manufacture of tires comprising silica as reinforcing filler, characterized by the fact that it consists in using a precipitated silica having an aluminum content of between 0.35% and 3% by weight (both inclusive), referenced to the weight of the silica and in using it as known per se, wherein the precipitated silica is prepared by reacting silicate with an acidifying agent to obtain a suspension of precipitated silica, performing a step selected from the group consisting of:
- (a) adding at least one compound A of aluminum and then a basic agent;
- and
- (b) adding a silicate and at least one compound A of aluminum simultaneously;
- and subsequently separating the resulting suspension by filtration to provide a cake.
A tire comprising a sulfur vulcanizable diene rubber composition, comprising silica as reinforcing filler, characterized by the fact that the silica is a precipitated silica having an aluminum content of between 0.35% and 3% by weight (both inclusive), referenced to the weight of the silica, prepared by reacting silicate with an acidifying agent to obtain a suspension of precipitated silica, performing a step selected from the group consisting of:
- (a) adding at least one compound A of aluminum and then a basic agent;
- and
- (b) adding a silicate and at least one compound A of aluminum simultaneously;
- and subsequently separating the resulting suspension by filtration to provide a cake.
A tire tread having a base of a sulfur vulcanizable diene rubber composition comprising silica as reinforcing filler, characterized by the fact that the silica is a precipitated silica having an aluminum content of between 0.35% and 3% by weight (both inclusive), referenced to the weight of the silica, prepared by reacting silicate with an acidifying agent to obtain a suspension of precipitated silica, performing a step selected from the group consisting of:
- (a) adding at least one compound A of aluminum and then a basic agent;
- and
- (b) adding a silicate and at least one compound A of aluminum simultaneously;
- and subsequently separating the resulting suspension by filtration to provide a cake.
Dependencies are inferred from the claim text.