Delayed action catalysts for aliphatic isocyanates

Details Delayed action catalysts for aliphatic isocyanates Delayed action catalysts for aliphatic isocyanates

C - Chemistry, Metallurgy

08

G

C08G 18/18 (2006.01) B29C 45/70 (2006.01) C08G 18/24 (2006.01) C08G 18/75 (2006.01)

Patent

CA 2219693

This invention relates to a process for the production of polyurethane molded article by the reaction injection molding (RIM) technique. This process comprises injecting a reaction mixture comprising a (cyclo)aliphatic polyisocyanate component having an NCO functionality of from 2.3 to 4.0 and an isocyanate-reactive component in the presence of a catalyst composition in a closed mold, allowing the reaction mixture to fully react and removing the molded article from the mold. Suitable catalyst compositions for the present invention comprise one or more tin carboxylates or tin halides, and one or more chelating polyamines.

L'invention porte sur un procédé pour la fabrication d'un article moulé en polyuréthane, grâce à la technique du moulage par injection-réaction (RIM). Ce procédé consiste à injecter un mélange réactionnel comprenant un polyisocyanate (cyclo)aliphatique, avec 2,3 à 4,0 fonctions NCO et un constituant réactif avec les isocyanates, en présence d'une composition catalytique dans un moule fermé, en laissant le mélange réactionnel réagir complètement, puis en retirant l'article moulé du moule. Parmi des compositions catalytiques appropriées pour la présente invention, on peut citer un ou plusieurs carboxylates d'étain ou halogénures d'étain, et une ou plusieurs polyamines chélatrices.

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