Process for improving the cured adhesion of a precured...

B - Operations – Transporting – 29 – C

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B29C 35/02 (2006.01) B60C 1/00 (2006.01) C08J 5/12 (2006.01) C08K 5/09 (2006.01) C08L 21/00 (2006.01)

Patent

CA 2244355

The present invention relates to a process for improving the cured adhesion of at least two rubber components which contact each other in a pneumatic tire. Prior to vulcanization of the pneumatic tire, one of the components is a precured rubber compound and the other is an uncured rubber compound. The process involves using a precured rubber compound comprising from 40 to 100 parts by weight of natural rubber or emulsion polymerized styrene-butadiene copolymer rubber containing .5 to 3 phr of a fatty acid, precipitated silica and no fatty acid other than contained in the natural rubber or emulsion polymerized styrene-butadiene rubber.

La présente invention concerne une méthode pour améliorer l'adhérence par réticulation d'au moins deux constituants de caoutchouc, en contact l'un avec l'autre dans un pneu. Avant la vulcanisation du pneu, l'un des constituants se trouve sous forme de caoutchouc pré-réticulé et l'autre sous forme de caoutchouc non réticulé. La méthode consiste à utiliser un caoutchouc pré-réticulé renfermant 40 à 100 parties en poids de caoutchouc naturel ou de caoutchouc de copolymère de styrène-butadiène, polymérisé par émulsion, contenant 0,5 à 3 phr d'un acide gras, de la silice précipitée, mais aucun acide gras autre que celui présent dans le caoutchouc naturel ou dans le caoutchouc de styrène-butadiène, polymérisé par émulsion.

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