Polyurethane and polyisocyanurate rigid foams prepared using ternary blowing agent mixtures

摘要

Use of a ternary blowing agent mixture containing water, HCFC-22, and either or both of methylene chloride or 1,1,1-trichloroethane allows the preparation of rigid urethane and polyisocyanurate foams displaying good dimensional stability and low aged k-factors.