Patent ID: 6057416
Filing Date: 2000-05-02
Classification: C08G

Abstract:
An active hydrogen group containing mixture which comprises:A) a catalyst system comprising:a) a zinc-containing compound capable of catalyzing the reaction of an isocyanate group with an hydroxyl group,b) a non-zinc-containing metal compound capable of catalyzing the reaction of an isocyanate group with an hydroxyl group, andc) a tertiary amine,wherein the amounts of materials used correspond to the following:1) the weight ratio of tertiary amine c) to metal compound b) is from 1:10 to 40:1,2) the weight ratio of tertiary amine c) to zinc compound a) is from 1:3 to 100:1, and3) the weight ratio of metal compound b) to zinc compound a) is from 1:5 to 50:1,B) one or more compounds having molecular weights of from 400 to 10,000, and containing at least two isocyanate-reactive groups,C) one or more compounds having molecular weights of from 62 to 399, and containing at least two isocyanate-reactive groups, andD) one or more acidic additives,wherein said catalyst system A) is present in an amount of from 0.1 to 8% by weight, based on the weight of B); said compounds having molecular weights of from 62 to 399 and containing at least two isocyanate-reactive groups are present in an amount of from 5 to 50% by weight, based on the weight of B); and said acidic additives D) are present in an amount sufficient to raise the acid number of the blend of components A), B), C) and D) to a value of from 0.1 to 12 mg KOH/g; with the proviso that the amount of zinc-containing compound A)a) is no more than 0.25% by weight, based on the total weight of components B), C) and D).