Polyurethane prepolymers based on oleochemical polyols, their pr

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

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Details

521115, 521129, 521131, 521137, 521138, 521140, 521159, 521164, 521167, 521170, 521172, 521173, C08G 1830

Patent

active

047420871

ABSTRACT:
The invention relates to isocyanate-terminated polyurethane prepolymers containing a stoichiometric excess of an isocyanate component comprised of one or more aromatic isocyanates containing on average from 2 to 4 isocyanate groups per molecule and a polyol component comprised of an oleochemical polyol prepared by epoxidation of a triglyceride containing olefinic unsaturation and subsequent ring opening with an alcohol. In use, accelerators, flameproofing agents, blowing agents and, optionally, liquefying agents, dyes and/or stabilizers, are included. The oleochemical polyol does not contain any free epoxide groups and is obtained by complete ring opening of epoxidized triglycerides of a fatty acid mixture containing at least partly olefinically unsaturated fatty acids with one or more C.sub.1 -C.sub.12 alcohols and partial conversion by alcoholysis or transesterification of the triglyceride derivatives to alkyl ester polyols containing from 1 to 12 carbon atoms in the alkyl radical. A process for the production of these polyurethane prepolymers and to their use as starting materials for the production of polyurethane foams is included.

REFERENCES:
patent: 3830760 (1974-08-01), Bengtson
patent: 4258140 (1981-03-01), Horacek et al.
patent: 4508853 (1985-04-01), Kluth et al.
patent: 4546120 (1985-10-01), Peerman et al.

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