Use of a pretreated precipitated silica as a reinforcing...

Details Use of a pretreated precipitated silica as a reinforcing... Use of a pretreated precipitated silica as a reinforcing...

C - Chemistry, Metallurgy

08

K

C08K 9/06 (2006.01)

Patent

CA 2561469

The invention relates to the use of a precipitated silica, pretreated by at least one organosilane hydrophobing compound or one hydrophobing silicone oil, as a reinforcing filler for silicone elastomer, the said pretreated silica being incorporated in the silicone elastomer by cold mixing and having the following features : - a BET specific surface ranging from 50 to 450 m /g, - a water wettability lower than 80, - a sulfur content lower than 0.1 % by weight. The invention is directed to the curable silicone elastomer composition thus obtained.

L'invention concerne l'utilisation de silice précipitée, prétraitée à l'aide d'au moins un composé organosilane hydrophobisant ou une huile silicone hydrophobisante, comme charge renforçante d'un élastomère silicone, ladite silice prétraitée étant incorporée dans l'élastomère silicone par mélange à froid et possédant les caractéristiques suivantes : une surface spécifique BET comprise entre 50 et 450 m?2¿/g, une mouillabilité à l'eau inférieure à 80, une teneur en soufre inférieure à 0,1 % en poids. L'invention se rapporte également à la composition élastomère silicone durcissable obtenue de cette manière.

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