Urethane-modified polyisocyanurate rigid foam.

摘要

Improved crack-free rigid cellular polyisocyanurate polymers are disclosed that are derived from the reaction of an organic polyisocyanate combination comprising two particular types of polymethylene polyphenyl polyisocyanates (a) and (b), a trimerization catalyst, minor amount of a polyol, a surfactant, and an inert volatile blowing agent having a boil. ing point from about 30°C to about 90°C.

The novel rigid foams are particularly useful in preparing high molded bodies of foam by making multiple pours or lifts on top of each other in a mold. The resultant molded body comprises a multiple of molded parts firmly fused to each other and crack-free. Such high molded bodies and process therefor are particularly useful in the insulation of ships.