Patent ID: 6797799
Filing Date: 2004-09-28
Classification: C08G,C09D,Y10T

Abstract:
A coating composition comprising the reaction product of:(A) an allophante-modifted diphenylmethane diisocyanate (MDI) NCO prepolymer comprising the reaction product of, (1) an allophante-modified diphenylmethane diisocyanate having an NCO group content of about 12 to about 32.5% by weight and comprising the reaction product of, (a) an allphatio alcohol or an aromatic alcohol; and (b) diphenylmethane diisocyanate comprising: (i) from about 10 to about 60% by weight of 2,4â€²-diphenylmethane diisocyanate, (ii) less than about 6% by weight of 2,2â€²-diphenylmethane diisocyanate, and (iii) the balance being 4,4â€²-diphenylmethane diisocyanate, wherein the sum of the percentages by weight of (1)(b)(i), (1)(b)(ii) and (1)(b)(iii) total 100% by weight of (1)(b), and (2) a polyether polyol having a molecular weight of about 134 to about 10,000, an OH number of about 420 to about 14 and a functionality of at least about 1.8; and (B) an isocyanate reactive component comprising, (1) from 30-80% by weight, based on 100% by weight (B), of a high molecular weight hydroxyl-terminated polyether polyol having a molecular weight of about 400 to about 4000 g/mol and having a functionality of about 2, and (2) from 70-20% by weight, based on 100% by weight (B), of a high molecular weight hydroxyl-terminated polyether polyol having a molecular weight of about 400 to about 6000 g/mol and having a functionality of about 3, at an isocyanate index of about 70 to about 130.