Method of producing rigid urethane foam

Details Method of producing rigid urethane foam Method of producing rigid urethane foam

1990-07-10

1992-02-25

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C08G 1814

Patent

active

050914383

ABSTRACT:
A method of producing a rigid urethane foam, which comprises reacting a blend polyol consisting of a polyol having a hydroxyl value of 300 to 450 mg KOH/g as prepared by using an acyclic sugar alcohol of 5 to 6 carbon atoms as an initiator and one or more other polyols, said blend polyol having a sugar alcohol content of 3 to 14 weight % and an average hydroxyl value of 300 to 430 mg KOH/g, with a polyisocyanate using 4.0 to 7.0 weight parts of water based on 100 weight parts of said polyol composition as a blowing agent, can reduce the CFC requirements by 50 to 100 percent as compared with the known production technology for rigid urethane foams and, moreover, the adhesive property of the resulting foam is not inferior to that of the conventional urethane foam.

REFERENCES:
patent: 4105599 (1978-08-01), Naka et al.
patent: 4487854 (1984-12-01), Hartman
patent: 4943597 (1990-07-01), Grunbauer et al.

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