RIGID URETHANE-MODIFIED POLYISOCYANURATE FOAMS AND PROCESSES FOR THEIR PREPARATION

摘要

Process for making rigid urethane-modified polyisocyanurate foams at an isocyanate index of between 200 and 350 comprising the step of reacting an organic polyisocyanate composition with an isocyanate-reactive composition comprising at least 50 wt% of polyester polyols in the presence of cyclopentane as blowing agent and no water or low amounts of water.