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US 4,833,176 AGranted
Process for the preparation of cold setting flexible polyurethane molded foams
AssigneeBayer Aktiengesellschaft
InventorsKlaus-Dieter Wolf, Hans-Joachim Kogelnik
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Abstract
The present invention is directed to a process for the preparation of cold setting, flexible, polyurethane, molded foams in a closed mold by reacting a polyisocyanate with a high molecular weight polyol in the presence of about 5 to 15, preferably about 6 to 12 parts by weight of water, based on the weight of the high molecular weight polyol at an isocyanate index below 70.
Claims4
A process for the preparation of a cold setting, flexible polyurethane molded foam which comprises reacting inside a closed mold at an isocyanate index below 70
- (a) a polyisocyanate comprising diphenylmethane diisocyanate and/or toluylene diisocyanate, said polyisocyanate containing up to about 25%, based on the total weight of polyisocyanate, of hexamethylene diisocyanate and/or of isophorone diisocyanate with
- (b) a compound having a molecular weight of 400 to about 10,000 and containing at least two isocyanate reactive groups in the presence of
- (d) about 5 to 15 parts by weight of water, based on 100 parts of component (b) and
- (c) optionally a chain lengthening and/or cross-linking agent having a molecular weight of 32 to 399 and containing at least two isocyanate reactive groups.
1 more element
Dependencies are inferred from the claim text.