Thiodiphenol copolycarbonates and their use as components of multilayered polymeric reflective bodies
US5532331A · kind A · utility
19Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1994 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Dec 14, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31507
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention provides novel copolycarbonates that exhibit improvements in glass transition temperature, refractive index, and limiting oxygen index compared to prior art thiodiphenol/bisphenol A copolycarbonates. The copolycarbonates of this invention comprise the reaction products of 4,4'-thiodiphenol and compounds such as 9,9-bis (4-hydroxyphenyl) fluorene with phosgene. They are useful as components of multilayered polymeric reflective bodies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.