Silane-terminated prepolymers and relative adhesive sealant...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/10 (2006.01) C08G 18/28 (2006.01) C08G 63/695 (2006.01) C08G 65/336 (2006.01) C09K 3/10 (2006.01)

Patent

CA 2663553

Silane-terminated prepolymers which contain, on at least one silicon atom, at least one hydrolyzable aryloxy type functional group. The use of these prepolymers, containing silyl-aryloxy terminated groups, in adhesive sealant formulations increases their reactivity so enabling the use of metal-based catalysts, which are in most cases toxic and act as oxidation catalysts, to be avoided or their quantity to be reduced compared with the standard quantity used in conventional formulations, yet ensuring considerably shorter cross-linking times than those of formulations based on known silane- terminated prepolymers.

L'invention concerne des prépolymères à terminaison silane contenant, sur au moins un atome de silicium, au moins un groupe fonctionnel de type aryloxy hydrolysable. L'utilisation de ces prépolymères contenant des groupes à terminaison silyle-aryloxy dans des formulations de scellement adhésif augmente leur réactivité permettant ainsi d'éviter l'utilisation de catalyseurs à base de métal qui sont, dans la plupart des cas, toxiques et servent de catalyseurs d'oxydation, ou de réduire leur quantité par rapport à la quantité standard utilisée dans les formulations classiques, garantissant ainsi des durées de réticulation considérablement plus courtes que celles des formulations basées sur des prépolymères à terminaison silane connus.

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