Process for the preparation of primarily closed cell rigid foams containing urethane groups or urethane- and isocyanurate groups, and their use

摘要

Disclosed is a process for the preparation of primarily closed cell rigid foams, useful for strengthening mechanical construction parts or for use as insulation material, containing urethane groups, or urethane and isocyanurate groups where the polyol component is a higher molecular weight polyester polyol, containing in bonded form units having one or more of the structures: -O-CH2-CH(CH3)-CH2-CH2-CH2O-, (I) -O-CH2-CH(C2H5)-CH2-CH2-O-, (II) -OC-CH(CH3)-CH2-CH2-CO- or (III) -OC-CH9C2H5)-CH2-CO- (IV) or a mixture of said polyester polyol and known polyester polyols and/or polyether polyols.