Copolycarbonate
US8816039B2 · kind B2 · utility
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2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 10, 2011 |
| Grant date | Aug 26, 2014 |
| Priority date | — |
| Expiry date | Nov 10, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a copolycarbonate that has a low photoelastic constant and has fewer foamed cells and that is in particular suitable for use in optical fields.The present invention is a copolycarbonate containing 10 to 90 mol % of a unit (A) derived from spiroglycol and 90 to 10 mol % of a unit (B) derived from aromatic phenol and having terminals satisfying the following expressions (i) and (ii),0.0001<(a)/(d)<0.1 (i)0.02<(b)/(d)<0.8 (ii)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.