Patent ID: 6031013
Filing Date: 2000-02-29
Classification: C08G

Abstract:
A process for producing foams based on polyisocyanate polyaddition products comprising reacting isocyanates with compounds which are reactive toward isocyanates and have a molecular weight of from 400 to 8000 in the presence of blowing agents, catalysts and, optionally, chain extenders and/or crosslinkers having a molecular weight of <400, auxiliaries and/or additives, wherein said isocyanates comprise isocyanuratized and/or biuretized hexamethylene 1,6-diisocyanate, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane and/or lysine ester diisocyanate, said compounds which are reactive toward isocyanates contain at least 50% primary hydroxyl groups, said catalysts comprise from 0.1 to 8% by weight of at least one tertiary amine and from 0.01 to 3% by weight of at least one metal salt, said blowing agent comprises from 0.5 to 5.3% by weight of water, where the percentages by weight are based on the weight of the compounds which are reactive toward isocyanates, and the reaction is carried out at >40.degree. C.