Patent ID: 6319962
Filing Date: 2001-11-20
Classification: C08G,C08J,C08K

Abstract:
A reaction system for the production of rigid polyurethane or urethane modified polyisocyanurate foams comprising:a) an organic polyisocyanate;b) an isocyanate reactive composition containing a plurality of isocyanate reactive groups;c) a blowing agent comprising a hydrocarbon and water wherein the amount of water is less than or equal to 1.0% by weight based on the total weight of the reaction system; andd) at least one halogen substituted phosphorus material wherein,said halogen is present in the amount of no more than 1.4% by weight relative to the total weight of the reaction system, andsaid phosphorus is present in the amount ranging from about 0.3 to about 2% by weight relative to the total weight of the reaction system; andsaid foam meets the Class I rating in accordance with ASTM E-84 testing.