Process to prepare roughly spandex of polyurethane or polyisocyanurate modified by urethane, rancid polyurethane or urethane modified polyisocyanurate foam, and composition reactive to isocyanate.

摘要

"The process to prepare foams ru00ecgidas polyurethane or polyisocyanurate modified by urethane foam ru00ecgida polyurethane or polyisocyanurate modified by urethane, and.The isocyanate reactive composition, process for preparing rigid polyurethane or polyisocyanurate foams modified by urethane, which comprises the step of reacting a component with a poliisocianatoThe polifuncional reactive isocyanate in the presence of a mixture of blowing agent comprising 50 to 90% by weight of cyclopentane and 10 to 50% by weight of a mixture of isopentane and / or n-pentaneAnd / or isobutane and n-butane, where the link weight of isopentane and / or N - pentane for isobutane and / or N - butane is between 5 / 95 and 95 / 5.