Polycarbonates derived from spirobiindanols and dihydroxyaromatic compounds
US6174987A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1997 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Aug 29, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Linear polycarbonate polymers are disclosed which contain spirobiindanol derivatives regularly alternating in the polymeric chain with derivatives of dihydroxyaromatic compounds, such as biphenols and bisphenols. These clear spirobiindane-dihydroxyaromatic polycarbonates exhibit high glass transition temperatures and exhibit good mechanical and optical properties. In addition, the alternating polycarbonates are thermally stable and remain ductile even at temperatures greater than 150.degree. C. The polycarbonates are therefore useful in high temperature processing and optical applications. The disclosed polycarbonates exhibit indices of refraction that differ sufficiently from those of randomly distributed SBI/BPA polycarbonates to make them useful in the manufacture of optical waveguides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.