Isocyanate-free primer composition for glass and glass ceramics

Details Isocyanate-free primer composition for glass and glass ceramics Isocyanate-free primer composition for glass and glass ceramics

C - Chemistry, Metallurgy

08

G

C08G 18/80 (2006.01) C08G 18/66 (2006.01) C08G 18/79 (2006.01) C09J 5/02 (2006.01)

Patent

CA 2533617

The invention relates to a primer composition comprising a compound A1 which contains isocyanate-reactive groups. In order to produce said compound A1, a polyisocyanate A that is provided with at least three isocyanate groups, at least one silane B of formula (I), and a crosslinking agent C comprising at least three isocyanate-reactive functional groups are used. Also disclosed is the use of the inventive primer composition as a primer for adhesives, sealing compounds, or floor coverings, especially one-component moisture-hardening polyurethane adhesives or polyurethane sealing compounds based on polyurethanes or polyurethane-silane hybrids. The inventive primer composition is characterized particularly by excellent adhesion to glass and glass ceramics as well as an extended open time.

L'invention concerne une composition de primaire comportant un composé A1 doté de groupes réactifs à l'isocyanate. Pour produire ce composé A1, on utilise un polyisocyanate A comportant au moins trois groupes isocyanate, au moins un silane B de formule (1), et un agent de réticulation C ayant au moins trois groupes fonctionnels réactifs à l'isocyanate. La présente invention porte également sur l'utilisation de cette composition de primaire pour des adhésifs, des joints et des revêtements de sol, en particulier des adhésifs polyuréthanne monocomposants durcissant à l'humidité ou des joints polyuréthanne monocomposants durcissant à l'humidité, à base de polyuréthannes ou d'hybrides polyuréthanne-silane. Ladite composition de primaire se caractérise notamment par une excellente adhésion sur le verre et la vitrocéramique et par un long temps ouvert.

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