Method for preparing siloxane-carbonate block copolymers
US4657989A · kind A · utility
11Cited by
7References
13Claims
0Family size
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Inventor
Key dates
| Filing date | Jun 11, 1985 |
| Grant date | Apr 14, 1987 |
| Priority date | — |
| Expiry date | Jun 11, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/186
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Siloxane-carbonate block copolymers are prepared by reacting (A) at least one siloxane compound with (B) at least one polycarbonate compound, one of reagents A and B being anionic and the other being reactive with nucleophiles. The siloxane compound is preferably a linear chlorosilane-terminated polysiloxane, a cyclic polysiloxane or a "living" polysiloxane anion. The polycarbonate composition may be a cyclic polycarbonate oligomer composition, preferably an oligomer mixture, or may be prepared by the reaction of such an oligomer composition with a polycarbonate formation catalyst such as tetramethylammonium tetraphenylborate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.