Use of carbon dioxide adducts as blowing agents in cellular and microcellular polyureas

摘要

A polyurea foam is formed from a reaction mixture comprising at least one polyisocyanate component and an active hydrogen component, wherein active hydrogen compounds of relatively high equivalent weight have an average of about 1.5 to about 10 active hydrogen-containing groups per molecule, of which active hydrogen-containing groups: an average of (a) from about 5 to about 60 percent are primary or secondary aliphatic amine groups or (b) at least about 25 percent are primary aromatic, Lewis acid- blocked primary aliphatic, secondary aliphatic or aromatic amine groups or mixtures thereof. Carbon dioxide is adducted to said active hydrogen component. The adduct releases carbon dioxide to blow the foam.