Graft copolymers from unsaturated monomers and azo di-ester polyols and polyurethanes prepared therefrom
AssigneeOlin Corporation
InventorsKiran B. Chandalia, Frank J. Preston
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Abstract
Graft copolymers are prepared by the polymerization of an ethylenically unsaturated monomer, or a mixture of such monomers, in the presence of an azo di-ester polyol. Presence of the azo group in the polyol reactant itself serves as a free radical initiator site for the graft copolymerization reaction. The copolymers formed are utilized in the formulation of polyurethane compositions.
Claims10
In a process for preparing a polyurethane foam from a reaction mixture comprising an organic polyisocyanate, a foaming agent, and a polyol reactant, the improvement characterized by including a polyol reactant which comprises a graft copolymer prepared by polymerizing an ethylenically unsaturated monomer or mixtures of such monomers in the presence of an azo di-ester polyol of the formula:
- ##STR9## wherein:
- m and r independently represent integers from 2 to 5,
- n and p independently represent integers from 0 to 5,
- R.sub.2 and R.sub.3 independently represent alkyl of 1-4 carbons, and
- ((HO).sub.m --R.sub.1 --O-- and --O--R.sub.4 --(OH).sub.r)
- independently represent residues of polyether or polyester polyols, R.sub.1 (OH).sub.m+1 and R.sub.4 (OH).sub.r+1, having an average equivalent weight ranging from about 250 to 5000, after removal of one hydroxy hydrogen therefrom, wherein R.sub.1 and R.sub.4 independently represent polyether polymer portions and polyester polymer portions thereof,
- said polymerizing occurring at a temperature at or above which the azo-carbon linkages of the azo di-ester polyol are ruptured.
Dependencies are inferred from the claim text.