Catalyst for low temperature cure of blocked isocyanates

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 175/04 (2006.01) C08G 18/24 (2006.01) C08G 18/80 (2006.01) C08G 63/85 (2006.01)

Patent

CA 2207146

The present invention comprises a polystannoxane catalyst, a curable composition containing the catalyst and a method of using the catalyst and curing the composition. The curable composition comprises: (i) a blocked isocyanate; (ii) a functional component containing reactive hydrogen; (iii) a polystannoxane catalyst for promoting the reaction of the blocked isocyanate with the functional component. A co-catalyst may also be employed based on Cu, Zn, Ni, Zr, Ce, Fe, Co, V, Sb and Bi and especially oxides, salts or chelates of said metals. The invention also relates to a method for curing a blocked isocyanate at a low reaction temperature which comprises combining the catalyst with the blocked isocyanate and functional component and heating to a temperature less than about 180°C to obtain a cured urethane.

La présente invention comprend un catalyseur à base de polystannoxane, une composition durcissable contenant le catalyseur et une méthode pour utiliser le catalyseur et faire durcir la composition. La composition durcissable comprend : (i) un isocyanate bloqué; (ii) un constituant fonctionnel contenant de l'hydrogène réactif; (iii) un catalyseur polystannoxanique pour promouvoir la réaction de l'isocyanate bloqué avec le constituant fonctionnel. Un co-catalyseur à base de Cu, Zn, Ni, Zr, Ce, Fe, Co, V, Sb et Bi peut également être employé, et particulièrement les oxydes, les sels ou les chélates de ces métaux. L'invention concerne également une méthode pour faire durcir un isocyanate bloqué à une faible température de réaction qui comprend la combinaison du catalyseur avec l'isocyanate bloqué et le constituant fonctionnel et le chauffage à une température inférieure à environ 180 degrés C pour obtenir un uréthane durci.

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