Novel isocyanate-prepolymer compositions.

摘要

Isocyanate composition comprising 10-90 pbw of polyester based isocyanate prepolymer having a functionality of 2.0-2.3 and made from a polyester polyol having a molecular weight of 1,000-10,000 and 10-90 pbw of polyether based isocyanate prepolymer having a functionality of 2.0-2.3 and made from a polyether polyol having a molecular weight of 1,000-10,000 and an ethylene oxide content of 3-50% weight, the free NCO value of the prepolymer composition being 8-25%; the amounts of polyether prepolymer and polyester prepolymer being calculated from the total amount of polyether prepolymer and polyester prepolymer in the composition.