Use of silicone compositions cross-linkable by cationic...

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

204/91.38, 402/1

C08K 5/55 (2006.01) C08K 5/00 (2006.01) C08L 83/06 (2006.01) C09K 3/10 (2006.01)

Patent

CA 2276717

The invention concerns the use of cross-linkable silicone compositions for fast, economical and simple impregnation and/or varnishing of flat joints (e.g. cylinder head gaskets). More precisely it concerns the use of silicone compositions cross-linkable under UV radiation, by cationic process, and in the presence of specific photoinitiators selected among onium borates or organometallic complexes, of which the borate counter-anions contain at least a boron bound to at least a substituted phenyl (Me, F). The silicone liquid precursor is a polydimethylsiloxane (PDMS) substituted by cross-linking functional groups, by cationic process (G¿fp?) under UV of the epoxy or vinyloxy type. These G¿fp? are present at the rate of 0.15 to 2.0 pr kg of PDMS. The invention also concerns the method for impregnating/varnishing flat joints (e.g. cylinder head gaskets) using the specific PDMS composition + photoinitiator of borate type as well as the treated joints and the composition themselves.

L'invention concerne l'utilisation de compositions silicones réticulables pour l'imprégnation et/ou le vernissage rapides, économiques et simples de joints plats (e.g. joints de culasse). Plus précisément, l'invention vise l'utilisation de compositions silicones réticulables sous UV, par voie cationique, et en présence de photoamorceurs spécifiques sélectionnés parmi les borates d'onium ou de complexes organométalliques, dont les contreanions borates comprennent au moins un Bore lié à au moins un Phényl substitué (Me, F). Le précurseur silicone liquide est un polydiméthylsiloxane (PDMS) substitué par des groupements fonctionnels de pontage, par voie cationique (Gfp) sous UV de type époxy ou vinyloxy. Ces Gfp sont présents, à raison de 0,15 à 2,0 équivalent par kg de PDMS. L'invention vise également le procédé d'imprégnation/vernissage de joints plats (e.g. joints de culasse), à l'aide de la composition spécifique PDMS fonctionnalisé + photoamorceur de type borate de même que les joint traités et la composition en eux-mêmes.

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