C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 271/28 (2006.01) C08G 18/10 (2006.01) C08G 18/40 (2006.01) C08G 18/48 (2006.01) C08G 18/65 (2006.01) C08G 18/76 (2006.01) C08G 18/79 (2006.01) C08L 75/04 (2006.01)
Patent
CA 2146388
The present invention relates to a process for the preparation of CFC-free, flexible polyurethane (molded) foams by reacting A) liquid polyisocyanate mixtures containing bonded urethane groups having a content of NCO groups of from 22 to 30 % by weight which are themselves prepared by reacting a mixture of diphenylmethane diisocyanates and polyphenyl-polymethylene polyisocyanates having a content of diphenylmethane diisocya- nate isomers of from 55 to 99 % by weight, based on the total weight, with at least one trifunctional polyoxypropylene- polyol having a hydroxyl number of from 20 to 60, with B) relatively high-molecular-weight polyhydroxyl compounds and, if desired, C) low-molecular-weight chain extenders and/or crosslinking ag- ents, in the presence of D) blowing agents, E) catalysts and, if desired, F) auxiliaries and/or additives, and to the polyisocyanate mixtures (A) modified by means of ure- thane groups which can be used according to the invention.
Brandt Peter
Bruchmann Bernd
Lutter Heinz-Dieter
Mertes Jurgen
Pittrich Klaus
Basf Aktiengesellschaft
Robic
LandOfFree
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