PROCEDIMIENTO PARA CATALIZAR REACCIONES ENTRE COMPUESTOS DE ISOCIANATOS POLIALIFATICOS Y COMPUESTOS CONTENIENDO VARIOS GRUPOS HIDROXILO

摘要

A catalyst composition for improving the reaction-cure rate of polyurethane compositions derived from poly aliphatic isocyanate compounds and poly-hydroxyl bearing compounds is disclosed. The catalyst composition consists essentially of (a) from about 25 to about 75 parts by weight of lead naphthenate; and (b) from about 75 to about 25 parts by weight of at least one dialkyltin dicarboxylate compound of the formula; wherein R is selected from C1 to C8 alkyl und R min is selected from C1 to C18 alkyl, based upon 100 parts by weight of said catalyst composition. The catalyst compositions promote sufficiently rapid cure rates such that injection moldable poly aliphatic-isocyanate-based polyurethane compositions may be provided. In a preferred embodiment, new and improved integral skin foam polyurethane compositions are disclosed which may be reaction injection molded to form integral skin foam shaped articles exhibiting ultraviolet light resistance and improved colorability.