Aromatic polycarbonate and production process therefor
US6608165B2 · kind B2 · utility
7Cited by
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16Claims
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Key dates
| Filing date | May 13, 2002 |
| Grant date | Aug 19, 2003 |
| Priority date | — |
| Expiry date | May 13, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/307
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polycarbonate having excellent color and stability and a production process therefor.In the production of a polycarbonate by melt polycondensing a dihydroxy compound and a carbonic acid diester in the presence of an ester exchange catalyst, the each content of an aldehyde group in the dihydroxy compound and the carbonic acid diester is reduced to 3×10−6 equivalent/mol or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.