Rubber composition, crosslinkable rubber compositions, and...

C - Chemistry – Metallurgy – 08 – L

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C08L 21/00 (2006.01) C08K 3/36 (2006.01) C08L 63/08 (2006.01)

Patent

CA 2515393

A rubber composition comprising (1) a diene rubber, (2) silica, and (3) an epoxidized liquid diene rubber having a number-average molecular weight of 10000 to 100000, characterized in that the contents of silica (2) and the epoxidized liquid diene rubber (3) are 0.1 to 150 parts by mass and 0.1 to 30 parts by mass respectively per 100 parts by mass of the diene rubber (1); crosslinkable rubber compositions characterized by comprising the rubber composition and a crosslinking agent; and crosslinked articles made by crosslinking the crosslinkable rubber compositions. The rubber composition is improved in the dispersibility of silica as observed in incorporating silica into a diene rubber and is excellent in processability and mechanical properties after crosslinking.

L'invention porte sur une composition de caoutchouc comprenant (1) un caoutchouc diène, (2) une silice et (3) un caoutchouc diène liquide époxydé ayant un poids moléculaire moyen au nombre compris entre 10.000 et 100.000. Cette composition se caractérise en ce que les teneurs en silice (2) et en caoutchouc diène liquide époxydé sont comprises respectivement entre 0,1 et 150 parties en poids et entre 0,1 et 30 parties en poids du caoutchouc diène (1). Les compositions de caoutchouc réticulable se caractérisent en ce qu'elles comprennent la composition de caoutchouc et un agent de réticulation. L'invention porte également sur des articles réticulés obtenus par réticulation des compositions de caoutchouc réticulable. La composition de caoutchouc est améliorée au niveau de la dispersibilité de la silice observée lorsqu'on incorpore la silice à un caoutchouc diène et présente d'excellentes aptitudes au traitement et d'excellentes propriétés mécaniques après réticulation.

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