Inventors:
Jonathan T. Martz - Glenshaw PA
Karl F. Schimmel - Verona PA
Padmanabhan Sundararaman - Allison Park PA
David N. Walters - Pittsburgh PA
Assignee:
PPG Industries, Inc. - Pittsburgh PA
International Classification:
C08G 1834, C08G 1867, B05D 136, B05D 704
Abstract:
A polyurethane polyanhydride oligomer is disclosed as well as a process for its preparation. The process involves the following steps:
(a) reacting a hydroxyl functional 2,4-dienoate ester with a polyisocyanate under conditions sufficient to react essentially all of the isocyanate groups to form a polyurethane polyene; and
(b) reacting by Diels Alder addition the unsaturated double bonds of the polyurethane polyene with an unsaturated polycarboxylic acid anhydride containing material. Also disclosed is a curable composition containing hydroxyl functional material and the aforedescribed polyurethane polyanhydride oligomer.