Urethane-modified isocyanurate foams having improved insulating and flame retardant properties
AssigneeBASF Wyandotte Corporation
InventorsThirumurti Narayan, John T. Patton, Jr., Moses Cenker, Harald P. Wulff
Life of this patent
Estimating the term…
Abstract
The incorporation of chloro-alkanol moieties into a urethane-modified isocyanurate foam has been found to improve the insulating properties of the foam as well as improve the flame-retardant properties thereof.
Claims5
A urethane-modified isocyanurate foam prepared by catalytically condensing in the presence of a blowing agent and employing an NCO/OH ratio of from 3:1 to 100:1, (a) a polyol with an organic polyisocyanate in the presence of from 15 to 80 parts per 100 parts of organic polyisocyanate of 2,2,2-trichloroethanol or (b) a polyol with a modified polyisocyanate having a free isocyanate content of from 5 to 30 weight percent obtained by the reaction of an organic polyisocyanate with from 15 to 80 parts per 100 parts of organic polyisocyanate of said 2,2,2-trichloroethanol.
A process of preparing a urethane-modified isocyanurate foam having improved insulating properties which comprises catalytically condensing, in the presence of a blowing agent and employing an NCO/OH ratio of from 3:1 to 100:1, (a) a polyol with an organic polyisocyanate in the presence of from 15 parts to 80 parts per 100 parts of polyisocyanate of 2,2,2-trichloroethanol or (b) a polyol with a modified polyisocyanate having a free isocyanate content of from 5 to 30 weight percent obtained by the reaction of an organic polyisocyanate with from 15 to 80 parts per 100 parts of organic polyisocyanate of said 2,2,2-trichloroethanol.
The process of claim 3 wherein the organic polyisocyanate is polymethylene polyphenyl polyisocyanate.
Dependencies are inferred from the claim text.