Method for preparing silica filled elastomeric compositions

Details Method for preparing silica filled elastomeric compositions Method for preparing silica filled elastomeric compositions

C - Chemistry, Metallurgy

08

L

C08L 23/22 (2006.01) C08K 3/36 (2006.01) C08K 5/541 (2006.01) C08K 5/5419 (2006.01) C08L 21/00 (2006.01) C08L 23/28 (2006.01)

Patent

CA 2413094

A process for preparing a cross-linked blend comprising a) mixing a copolymer of a C4 to C7 isoolefin and a para-alkylstyrene with silica, b) separately mixing a general purpose rubber with silica, wherein one or more silane coupling agents is mixed with at least one of the silica/copolymer or silica/general purpose rubber blends, and c) mixing the silica/copolymer blend with the silica/general purpose rubber blend. Typical silane coupling agents include bis(3-triethoxysilylpropyl) tetrasulfide, 3-thiocyanatopropyl- triethoxysilane, 3-mercaptopropyl-trimethoxy silane, and one embodiment of the copolymer is a terpolymer of isobutylene, para-methylstyrene, and bromo-para- methylstyrene.

Procédé de préparation d'un mélange réticulé qui consiste (a) à mélanger un copolymère d'une isooléfine C¿4? à C¿7? et d'un para-alkylstyrène avec de la silice, (b) à mélanger séparément un caoutchouc polyvalent avec de la silice, un ou plusieurs agents de couplage silane étant mélangés avec le mélange silice/copolymère et/ou avec le mélange silice/caoutchouc polyvalent et (c) à mélanger le mélange silice/copolymère avec le mélange silice/caoutchouc polyvalent. Les agents de couplage silane typiques comprennent le bis(3-triéthoxysilyl) tétrasulfure, le 3-thiocyanatopropyl-triéthoxysilane, et le 3-mercaptopropyl-triméthoxysilane, et dans un mode de réalisation, le copolymère est un terpolymère d'isobutylène, de para-méthylstyrène et de bromo-para-méthylstyrène.

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