Rigid foams with improved insulation properties and a process fo

Details Rigid foams with improved insulation properties and a process fo Rigid foams with improved insulation properties and a process fo

1998-09-14

1999-03-30

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521131, 264DIG5, C08J 914

Patent

active

058890661

ABSTRACT:
Rigid foams having improved 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 about 30% by weight of at least one C.sub.2 -C.sub.5 polyfluoroalkane and from about 70 to about 99% by weight of an HCFC, preferably an HCFC selected from chlorodifluoromethane, 1,1-dichloro-1-fluoroethane, 1-chloro-1,1-difluoroethane and mixtures thereof.

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patent: 5318996 (1994-06-01), Yu-Hallada et al.
patent: 5397808 (1995-03-01), Doerge et al.

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