Michelin Recherche Et Technique S.a.

Compagnie Generale Des Establissements Michelin - Michelin & Cie

Compagnie G&eacute;n&eacute;rale Des Etablissements Michelin - Michelin & Cie

Laure Simonot

Emmanuel Custodero

Jean-Claude Tardivat

A reinforcing aluminum-based filler which can be used for reinforcing diene rubber compositions intended for the manufacture of tires, comprising an aluminum (oxide-)hydroxide corresponding, with the exception of any impurities and the water of hydration, to the general formula (a and b being real numbers):Al(OH)O, with 0&#x3c;&#x2266;3 and=(3&#x2212;)/2, &#x2003;&#x2003;(I)the specific BET surface area of which is between 30 and 400 m/g, the average particle size (by mass) dof which is between 20 and 400 nm and the disagglomeration rate, &#x3b1;, of which, measured via an ultrasound disagglomeration test at 100% power of a 600-watt ultrasonic probe, is greater than 5&#xd7;10&#x3bc;m/s is provided. A rubber composition suitable for the manufacture of tires comprising said aluminum-based filler as reinforcing filler.

Reinforcing aluminum-based filler and rubber composition comprising such a filler

A reinforcing aluminum-based filler which can be used for reinforcing diene rubber compositions intended for the manufacture of tires, comprising an aluminum (oxide)hydroxide corresponding, with the exception of any impurities and the water of hydration, to the general formula (a and b being real numbers):Al(OH)O, with 0&#x3c;&#x2266;3 and=(3&#x2212;)/2,&#x2003;&#x2003;(I)the specific BET surface area of which is between 30 and 400 m/g, the average particle size (by mass) dof which is between 20 and 400 nm and the disagglomeration rate, &#x3b1;, of which, measured via an ultrasound disagglomeration test at 100% power of a 600-watt ultrasonic probe, is greater than 5&#xd7;10&#x3bc;m/s is provided. A rubber composition suitable for the manufacture of tires comprising said aluminum-based filler as reinforcing filler.

Rubber composition for a tire, based on diene elastomer and a reinforcing titanium oxide

The invention provides a process for preparing a modified carbon black with an adhering layer of aluminum oxide and/or hydroxide. This process involves (a) impregnating a starting carbon black with a colloidal suspension formed by hydrolysis of a solution of aluminum alkoxide in an alcoholic solvent, (b) removing the alcoholic solvent by evaporation, and (c) heat-treating the black thus impregnated so as to transform the aluminuous layer present at its surface into an adhering layer of aluminum oxide and/or hydroxide. The modified carbon black prepared by the process is also provided.

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Clermont-Ferrand, France

Laure Simonot