Rigid foams and a process for the production of such foams

Details Rigid foams and a process for the production of such foams Rigid foams and a process for the production of such foams

C - Chemistry, Metallurgy

08

G

C08G 18/72 (2006.01) C08G 18/16 (2006.01) C08G 18/40 (2006.01) C08G 18/48 (2006.01) C08J 9/228 (2006.01)

Patent

CA 2446371

Rigid foams having good insulation properties are made by reacting a polyisocyanate with an isocyanate-reactive material in the presence of a blowing agent mixture composed of from about 1 to 70% by weight of a low boiling hydrogen containing chlorofluorocarbon, such as chlorodifluoromethane (HCFC-22) and from 30 to 99% by weight of a C2-C5 polyfluoroalkane, such as 1,1,1,3,3-pentafluoropropane (HFC-245fa).

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