Polydiorganosiloxane oligourea segmented copolymers and a process for making same
US6441118B2 · kind B2 · utility
60Cited by
39References
40Claims
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Assignee
Inventors
Key dates
| Filing date | Sep 26, 1997 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Sep 26, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/452
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides polydiorganosiloxane oligourea segmented copolymers. The copolymers contain soft polydiorganosiloxane units, hard segments that are diisocyanate residues, the polydiorganosiloxane units and diisocyanate residues being connected by urea linkages, and terminal groups that are non-reactive, reactive under free radical or moisture cure conditions, or amines. The invention also provides methods of preparing the copolymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.