Process for preparing rigid polyurethane foams

Details Process for preparing rigid polyurethane foams Process for preparing rigid polyurethane foams

C - Chemistry, Metallurgy

08

G

403/18, 403/32

C08G 18/50 (2006.01) C08G 18/32 (2006.01)

Patent

CA 1271594

ABSTRACT This invention is directed to a process for preparing a rigid polyurethane foam which comprises reacting a polyisocyanate with a polyol in the presence of a blowing agent, a polymerization catalyst and a surfactant. The polyol as the formula (I) Image 32,040-F wherein R1, R2, and R3 are, each independently, hydrogen, a C1-C6 alkyl group, bearing one or more halogen, hydroxyl, optionally substituted phenyl, optionally substituted cycloalkyl, or optionally sub- stituted phenyl ether substituents, n is 1 or 2, and x + y + z is from 3.5 to 5.7. Rigid polyurethane foams produced by this process show a reduced degree of friability. 32,040-F

512870

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