Urethane-modified carbodiimide-isocyanurate foams prepared...

Details Urethane-modified carbodiimide-isocyanurate foams prepared... Urethane-modified carbodiimide-isocyanurate foams prepared...

C - Chemistry, Metallurgy

08

J

403/12.1

C08J 9/02 (2006.01) C08G 18/10 (2006.01) C08G 18/50 (2006.01) C08G 18/76 (2006.01) C08G 73/00 (2006.01)

Patent

CA 1057000

ABSTRACT OF THE DISCLOSURE Rigid cellular foams characterized by carbodiimide linkages exhibit low friability and excellent flame retardancy when prepared from isocyanates rich in toluene diisocyanate. The foams hereof are prepared by the catalytic condensation of the iso- cyanates by using either (1) isocyanate quasi-prepolymers or (2) a two-stage process wherein isocyanate and polyol are first reacted to form a urethane-containing intermediate having free isocyanate groups and then the remaining isocyanate groups are converted to carbodiimide groups and isocyanurate groups by the catalytic condensation thereof.

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