Rubber composition for magnesium hydroxide wafer-reinforced tire

摘要

The invention relates to a rubber composition having improved vulcanization kinetics, which can be used in particular for manufacturing tires or semi-finished products for tires, based on at least one diene elastomer, a reinforcing filler and a coupling agent providing the bond between filler and elastomer, characterized in that said reinforcing filler comprises synthetic magnesium hydroxide Mg(OH)2 wafers, covered with silica. The invention also relates to the use of such a composition for manufacturing rubber articles, in particular tires or semi-finished products made of rubber intended for these tires, especially treads. The invention also relates, per se, to this synthetic magnesium hydroxide in the form of silica-covered wafers, and also to its use as a reinforcing filler, especially in a diene elastomer matrix.

主权项

1. A rubber composition based on at least one diene elastomer, a reinforcing filler and a coupling agent, wherein said reinforcing filler comprises synthetic magnesium hydroxide Mg(OH)2 covered with silica, wherein the synthetic magnesium hydroxide Mg(OH)2 has a specific surface area, measured by a BET method, between 60 and 180 m2/g, and wherein the synthetic magnesium hydroxide Mg(OH)2 is composed of aggregates agglomerated together, the aggregates include magnesium hydroxide Mg(OH)2 particles which are anisometric and in the form of wafers, and the magnesium hydroxide Mg(OH)2 particles have an aspect ratio (A2=L2/T2) greater than 1.5, L2 and T2 respectively representing the number-average length and thickness of the particles.