Segmented urea and siloxane copolymers and their preparation methods
US7262260B2 · kind B2 · utility
14Cited by
3References
5Claims
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Key dates
| Filing date | Jun 15, 2005 |
| Grant date | Aug 28, 2007 |
| Priority date | — |
| Expiry date | Jun 15, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/458
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Using novel synthetic techniques, siloxane-urea segmented copolymers are made. The copolymers advantageously contain a polyether interface, with controlled morphologies and properties. High molecular weight, high strength siloxane-urea copolymers with urea hard segment contents ranging from 5 to over 60% by weight may be prepared. Polymer properties that can independently be controlled include modulus (1.0 to 120 MPa), ultimate tensile strength (1.5 to 25 MPa), level of equilibrium water absorption (˜0 to 100% by weight) and refractive index (1.43 to 1.46).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.