Optical film
US8455611B2 · kind B2 · utility
3Cited by
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13Claims
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Key dates
| Filing date | Sep 13, 2012 |
| Grant date | Jun 4, 2013 |
| Priority date | — |
| Expiry date | Sep 13, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133637
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical film comprising a copolycarbonate composed of 25 to 90 mol % of unit (A) of the following formula,and 10 to 75 mol % of unit (B) of the following formula,wherein the substituents are defined herein, and the optical film satisfies the following expression (1), R(450)<R(550)<R(650) (1), wherein R(450), R(550) and R(650) are in-plane retardation values of the film at wavelengths of 450 nm, 550 nm and 650 nm. The optical film exhibits a desired chromatic dispersion, low photoelasticity and excellent melt processability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.