Patent ID: 6495652
Filing Date: 2002-12-17
Classification: C08G,C09K

Abstract:
A prepolymer containing isocyanate groups, having an NCO content of at least 30.0% by weight comprising a reaction product of an isocyanate mixture of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates and having a proportion of two-ring isomers of from 25% to 70% by weight based on the total weight of said isocyanate mixture and an at least 4-functional polyol or a mixture of polyols having a mean functionality of at least 4, where the polyol or polyol mixture has a hydroxyl number of from 200 to 1,650 mg KOH/g and a number average molecular weight of less than 1100 g/mol.