Process for the preparation of viscoplastic polyurethane integral foams showing improved tear strength, elongation at breack and tensile strength

摘要

A method for the preparation of tough elastic polyurethane integral foams with improved tear strength, extension at break and tensile strength, comprises reacting optionally modified organic polyisocyanates (A) with at least one high mol.wt. compound (B) containing two or more reactive hydrogen atoms and optionally with low mol.wt. chain extenders and/or cross-linking agents (C), in the presence of catalysts (D), optional propellants (E) and optional auxiliary agents and/or additives (F). At least one recycled polyol obtained by glycolysis of tough elastic polyurethane integral foam using glycidyl ethers is used as (B). Also claimed are tough elastic polyurethane integral foams prepared by the above method.