Process for producing polycarbonates
US6790928B2 · kind B2 · utility
1Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2003 |
| Grant date | Sep 14, 2004 |
| Priority date | — |
| Expiry date | Mar 18, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/305
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
100 parts by weight of the polycarbonate produce by melt polycondensation of a carbonic acid diester and a dihydroxy compound and 0.0001 to 0.1 part by weight of a phosphite compound represented by following Formula (I) are formulated: wherein Rs are each one of a hydrogen atom, an alkyl group, an aryl group, and an oxyalkyl group, where the two Rs are not concurrently hydrogen atoms. The process of the invention can yield polycarbonate molding materials that have satisfactory hue and can be used in a wide variety of applications such for optical materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.