Polyurethane polyanhydride oligomers and method of preparation
US5059655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1990 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Apr 5, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/831
- 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 a hydroxyl functional material and the aforedescribed polyurethane polyanhydride oligomer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.