Process for the preparation of foams characterized by isocyanura

Details Process for the preparation of foams characterized by isocyanura Process for the preparation of foams characterized by isocyanura

1977-05-05

1978-08-29

Ivy, C. Warren

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521170, 521902, C08G 1822, C08G 1814, C08G 1848

Patent

active

041102703

ABSTRACT:
Foams characterized by isocyanurate and urethane linkages are prepared by condensing: (a) an organic polyisocyanate with a polyol or (b) a quasi-prepolymer in the presence of a blowing agent and a catalytically effective amount of an alkali metal salt of an organic sulfinic acid. The catalysts of the invention offer the advantages of longer cream times and fully cured foams in acceptable times thus finding particular utility in pour-in-place and slab stock foaming applications.

REFERENCES:
patent: 3628872 (1971-12-01), Ashida
patent: 3943075 (1976-03-01), Fishbein

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