Catalysts for low temperature cure of blocked isocyanates

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/80 (2006.01) C08G 18/16 (2006.01) C08G 18/22 (2006.01) C08G 18/24 (2006.01) C08G 18/58 (2006.01) C08G 18/62 (2006.01) C08G 18/64 (2006.01) C08G 18/65 (2006.01) C09D 5/24 (2006.01) C09D 5/44 (2006.01) C09D 175/04 (2006.01) C23C 4/04 (2006.01)

Patent

CA 2144541

The present invention comprises a curable composition comprising: (i) a blocked reactive component comprising a blocked isocyanate or a blocked isothiocyanate; (ii) a functional component containing reactive hydrogen; (iii) a triorganotin catalyst for promoting the reaction of the blocked reactive component with the functional component. The composition may also be admixed with water. A co-catalyst may also be employed based on Cu, Zn, Ni, Fe, Co, V, Sb and Bi and especially oxides, salts or chelates of said metal where said metals are divalent. The invention also relates to a method for curing a blocked isocyanate or blocked isothiocyanate at a temperature below about 150 °C which comprises combining a triorganotin catalyst with the blocked reactive component and functional component and heating at a temperature less than about 150 °C to obtain a cured urethane or thiourethane.

L'invention concerne une composition durcissable comprenant: (i) un constituant réactif bloqué comprenant un isocyanate bloqué ou un isothiocyanate bloqué; (ii) un constituant fonctionnel contenant de l'hydrogène réactif; (ii) un catalyseur à base de triorganotine servant à promouvoir la réaction du constituant réactif bloqué avec le constituant fonctionnel. On peut également mélanger cette composition avec de l'eau. On peut également utiliser un co-catalyseur à base de Cu, Zn, Ni, Fe, Co, V, Sb et Bi et particulièrement à base des oxydes, des sels ou des chélates dudit métal quand lesdits métaux sont divalents. L'invention concerne également un procédé de durcissemnt d'un isocyanate bloqué ou d'un isothiocyanate bloqué à une température inférieure à 150 DEG C, consistant à combiner un catalyseur à base de triorganotine avec le constituant réactif bloqué et avec le constituant fonctionnel, et à chauffer ce produit combiné à une température inférieure à 150 DEG C, afin d'obtenir un uréthanne durci ou un thio-uréthanne durci.

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