Processes for producing polycarbonate
US8445624B2 · kind B2 · utility
11Cited by
2References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2008 |
| Grant date | May 21, 2013 |
| Priority date | — |
| Expiry date | Mar 22, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1352
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A subject for the invention is to provide a polycarbonate having excellent mechanical strength, heat resistance, a low refractive index, a large Abbe number, reduced birefringence, and excellent transparency. The invention relates to a polycarbonate characterized by being obtained by subjecting one or more dihydroxy compounds including a dihydroxy compound having at least one linking group —CH2—O— in the molecule thereof to melt polycondensation with a carbonic acid diester, and by having a reduced viscosity of from 0.40 dL/g to 1.70 dL/g and a formic acid content lower than 5 ppm by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.