Polyurethane polyanhydride oligomers and method of preparation
US5182355A · kind A · utility
46Cited by
2References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1991 |
| Grant date | Jan 26, 1993 |
| Priority date | — |
| Expiry date | Sep 30, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/939
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyurethane polyanhydride oligomer is disclosed as well as a process for its preparation. The process involves the following steps: PA0 (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 PA0 (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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.