Foams made with polyester polyols and hydrofluorocarbons as blowing agents

摘要

A closed cell, rigid, isocyanate-based polymer foam which comprises the reaction product of a polyisocyanate and a polyester polyol or a mixture of a polyester polyol and at least one other isocyanate-reactive compound in the presence of a blowing agent comprising a hydrofluorocarbon having 3 to 7 carbon atoms and no chlorine atom or a mixture of the hydrofluorocarbon and at least one co-blowing agent.