Method of preparing transparent silicone-containing copolycarbonates
US6833422B2 · kind B2 · utility
29Cited by
8References
21Claims
0Family size
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Key dates
| Filing date | Aug 16, 2002 |
| Grant date | Dec 21, 2004 |
| Priority date | — |
| Expiry date | Jan 9, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/448
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Silicone-containing copolycarbonates possessing relatively long siloxane chains and yet having low haze values and hence transparency are prepared by reacting a siloxane bischloroformate with a hydroxy-terminated polycarbonate oligomer to afford a silicone-containing polycarbonate intermediate which is then reacted with a bisphenol, phosgene and a chainstopper under interfacial reaction conditions to afford a product silicone-containing copolycarbonate. The product silicone-containing copolycarbonates have lower haze values than similarly constituted copolycarbonates prepared by other methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.