Preparation of cellular plastics by the polyisocyanate polyaddition process in the presence of tertiary alcohols

Abstract From the Canadian patent

A process for the preparation, of cellular plastics preferably hard structural poly-, urethane foams by the polyisocyanate polyaddition, process involves reacting a) an organic and/or modified organic polyisocyanate with, b) at least one high-molecular-weight compound containing at least two reactive hydrogen atoms and if, desired, c) a low-molecular-weight chain extender and/or crosslinking agent, in the presence of, d) a blowing agent from the group comprising tertiary alcohols (di), preferably tertiary butanol or a, mixture of at least one tertiary alcohol (di) and water (dii), e) a catalyst and, if desired f) assistants and/or additives.