Modified polyurethane liquid polymer compositions and their preparation.

摘要

A novel heat curable liquid polymer composition comprises a modified urethane oligomer containing terminal ethylenic unsaturation and a free radical catalyst. It is prepared by heating a mixture of the oligomer and the catalyst. In a preferred embodiment. the polymer composition further includes a reinforcing agent andor a filler; the cured composition demonstrates enhanced impact properties and is particularly useful in automotive body constructions. The urethane oligomer has a final free NCO content from 0% to 20% and has been prepared by reacting (a) an isocyanate-terminated prepolymer having a final free NCO content ranging from 0.50, to 30% and that is the product of reacting an organic polyisocyanate with a polyol having an average equivalent weight in the range 75 to 500 and an average functionality of at least about 3, with (b) an isocyanate-reactive-group-containing unsaturated acrylate or unsaturated amide monomer.