Optical film
US8877304B2 · kind B2 · utility
4Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 2008 |
| Grant date | Nov 4, 2014 |
| Priority date | — |
| Expiry date | Nov 16, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31507
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
It is an object of the present invention to provide an optical film which has reverse chromatic dispersibility that its retardation becomes smaller as the wavelength becomes shorter and a low photoelastic constant.The optical film is made of a polycarbonate copolymer containing a unit (A) represented by the following formula:
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.