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US 6,586,490 B1Granted
Polyol mixture for the preparation of rigid polyurethane foams
AssigneeBayer Aktiengesellschaft
InventorsKarl-Werner Dietrich, Torsten Heinemann, Manfred Dietrich
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Abstract
The present invention relates to polyol mixtures which are suitable for the preparation of rigid polyurethane foams and comprise addition products of alkylene oxide on aromatic di- or polyamines, and rigid foams prepared with these polyol mixtures.
Claims16
A polyol mixture comprising
- a) 5-60 wt. %, based on total weight of a)+b), of an alkylene oxide on an aromatic diamine or polyamine addition product having a molar ratio of alkylene oxide to hydrogen atoms bonded to nitrogen of the diamine or polyamine no greater than 1:1 and
- b) 40-95 wt. %, based on total weight of a)+b), of a polyether polyol and/or polyester polyol having an OH number of from 250-500.
Dependencies are inferred from the claim text.