Polyurethane polyanhydride oligomers and method of preparation

Details Polyurethane polyanhydride oligomers and method of preparation Polyurethane polyanhydride oligomers and method of preparation

C - Chemistry, Metallurgy

07

D

402/158, 117/195

C07D 307/83 (2006.01) C08G 18/67 (2006.01) C08G 18/83 (2006.01) C09D 175/14 (2006.01)

Patent

CA 2039806

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.

Un oligomère de polyuréthane-polyanhydride est divulgué ainsi qu'un procédé de préparation. Le procédé comporte deux étapes : (a) réaction d'un ester 2,4-diénoïque hydroxylé avec un polyisocyanate dans des conditions permettant la réaction d'essentiellement tous les groupes isocyanates de façon à former un polyuréthane-polyène; et (b) réaction des doubles liaisons du polyuréthane-polyène par addition de Diels-Alder sur une matière contenant un anhydride polycarboxylique.

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