Urethane-modified polyisocyanurate rigid foam

摘要: Improved crack-free rigid cellular polyisocyanurate polymers are disclosed that derived from the reaction of an organic polyisocyanate combination comprising two particular types polymethylene polyphenyl polyisocyanates (a) and (b), a trimerization catalyst, minor amount polyol, surfactant, inert volatile blowing agent having boiling point about 30° C. to 90° The novel foams particularly useful in preparing high molded bodies foam by making multiple pours or lifts on top each other mold. resultant body comprises parts firmly fused crack-free. Such process therefor insulation ships.