USE OF CAPPED SURFACTANTS FOR PRODUCTION OF RIGID POLYURETHANE FOAMS BLOWN WITH HYDROCHLOROFLUOROCARBONS

摘要

USE OF CAPPED SURFACTANTS FOR PRODUCTION OF RIGID POLYURETHANE FOAMS BLOWN WITH HYDROCHLOROFLUOROCARBONS Composition and process for production of rigid polyurethane and polyisocyanurate foam, and foam made from such composition and by such process. A composition for production of rigid polyurethane foam includes a) an organic compound containing at least 1.8 isocyanate-reactive groups per molecule; b) an organic polyisocyanate selected from the group consisting of: bl) alkyl or cycloalkyl polyisocyanates having at least two isocyanate groups, and in which the alkyl portion contains 2-6 carbon atoms; and b2) aromatic polyisocyanates containing at least 2 isocyanate groups, and at least two six-membered aromatic rings which are fused together or are joined by a carbon-carbon bond or are linked by a divalent linkage selected from the group consisting of alkylene groups of 1-6 carbon atoms, -O-, -CO-, -CO2-, -S-, and -SO2-; c) a catalytically effective amount of a catalyst capable of promoting formation of urethane bonds; d) an effective amount of a hydrochlorofluorocarbon blowing agent; and e) a foam stabilizing amount of a hydrolytically stable siloxane-oxyalkylene block copolymer surfactant containing capped hydroxyl groups in the oxyalkylene portion of the molecule. A process for making rigid polyurethane foam involves reacting and foaming such composition. D-16830