Two component oligomeric phosphate/isocyanate composition

Claim 1

A thermosetting composition comprising: I. A first component comprising an oligomeric hydroxy functional phosphate ester having a number average molecular weight of between about 500 and about 5000 and being prepared by reaction of: (a) polyepoxide resin having a number average molecular weight of between about 120 and about 4500 and being selected from the group consisting of aliphatic, cycloaliphatic and aromatic polyepoxides; and (b) phosphate acid ester having the formula ##STR3## wherein n=1 to 2 and R is selected from alkyl and aryl groups containing between about 1 and about 20 carbon atoms, said phosphate ester and said polyepoxide being reacted in such amounts that there are between about 0.5 and about 1 acid groups per epoxy group in said reaction mixture; and II. A second component comprising isocyanate crosslinking agent selected from the group consisting of aliphatic, cycloaliphatic and aromatic polyisocyanates, said second component being incorporated and mixed with said first component immediately prior to disposition of said composition for its intended use in an amount such that there are between about 0.75 and about 1.2 reactive isocyanate groups per hydroxyl group in said first component.