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

A process of preparing a polyurea foam by reacting in the substantial absence of ammonium carbamates, a reaction mixture containing 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 amine groups;
• Lewis acid-blocked primary aliphatic, secondary aliphatic or aromatic amine groups;
• or mixtures of such groups;
• said relatively high equivalent weight active hydrogen compounds having adducted thereto sufficient carbon dioxide to produce the foam having a preselected density and wherein the resulting adducted carbon dioxide functions as a blowing agent.