Method for preparing moulded polureapolyurethane flexible foams

摘要

A method to prepare polyurethane and/or polyurea flexible foams which comprises reacting: A. an organic polyisocyanate composition B. an isocyanate-reactive composition containing: a. at least one high Mw isocyanate-reactive compound b1. a primary or secondary amino-functional compound (so-called chain-extender) of Mw below 1000 in an amount of less than 1% by wt of high Mw isocyanate-reactive compound(s) or b2. a mixture of at least two chain extenders of which at least one is a primary or secondary amino-functional compound of Mw below 1000, in an amount of 0.1% to 10% by wt of high Mw isocyanate-reactive compound(s) C. H2O D. optionally catalysts E. optionally further blowing agents which are different from H2O. F. optionally further conventional additives.