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AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsHermann Kluth, Bert Gruber, Alfred Meffert, Wilfried Huebner
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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.
In a polyurethane prepolymer containing terminal isocyanate groups which comprises the reaction product of (1) a stoichiometric excess of an isocyanate and (2) an oleochemical polyol, the improvement wherein said oleochemical polyol is obtained by (a) the complete ring opening of an epoxidized triglyceride of a fatty acid mixture having olefinic unsaturation with a C.sub.1 -C.sub.12 alcohol to provide a triglyceride derivative containing substantially no epoxide groups and (b) partial conversion of said triglyceride derivative to an alkyl ester polyol in which the alkyl group contains from 1 to 12 carbon atoms.
Dependencies are inferred from the claim text.