Curable composition

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/22 (2006.01) C08F 8/42 (2006.01) C08L 83/05 (2006.01)

Patent

CA 2221974

A curable composition comprising the components (A), (B), (C) and (D), viz. (A) an isobutylene polymer which contains in a molecule, at least one alkenyl group capable of hydrosilylation reaction; (B) a curing agent which contains at least two hydrosilyl groups in a molecule; (C) a hydrosilylation catalyst; and (D) an organic compound which contains in a molecule, at least one alkenyl or alkynyl group capable of hydrosilylation reaction. This composition is excellent in workability because of its low viscosity, and has such advantages that the cured product thereof has large strength and further that the weight loss by heating is small. Since a large amount of an inorganic filler can be blended with this composition, it is possible to obtain a composition having high thixotropy and little sagging.

Composition réticulable renfermant les constituants (A), (B), (C) et (D); (A) est un polymère d'isobutylène, dont chaque molécule renferme au moins un groupe alcényle pouvant donner une réaction d'hydrosilylation; (B) est un agent de réticulation contenant au moins deux groupes hydrosilyle dans une molécule; (C) est un catalyseur d'hydrosilylation; (D) est un composé organique, dont chaque molécule renferme au moins un groupe alcényle ou alcynyle pouvant donner une réaction d'hydrosilylation. Cette composition est excellente du point de vue ouvrabilité en raison de sa faible viscosité; de plus, une fois réticulée, elle offre une très grande résistance, et enfin la perte de poids par chauffage est faible. Étant donné qu'on peut mélanger une grande quantité de charge minérale avec cette composition, il est possible d'obtenir une composition possédant une thixotropie élevée et peu d'affaissement.

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