Isocyanate terminated quasi-prepolymers useful for preparing...

Details Isocyanate terminated quasi-prepolymers useful for preparing... Isocyanate terminated quasi-prepolymers useful for preparing...

C - Chemistry, Metallurgy

08

G

403/14, 402/150

C08G 18/42 (2006.01) C08G 18/10 (2006.01) C08J 9/04 (2006.01)

Patent

CA 1335921

Polyurethane/polyisocyanurate rigid foams having low thermal conductivity are prepared from isocyanate- terminated quasi-prepolymers prepared from polyester polyols derived from phthalic anhydride or from the transesterifica- tion of polyethylene terephthalate scrap, with a low molecular weight aliphatic polyol, preferably a low molecular weight glycol or triol. More particularly,the rigid foams are prepared by reacting the quasi-prepolymers in the presence of a trimerization catalyst, optionally in the presence of a polyol and urethane-promoting catalyst. The products have uses as building and refrigeration insulation.

557050

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