Optical film
US6881453B2 · kind B2 · utility
6Cited by
4References
19Claims
0Family size
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Key dates
| Filing date | Apr 23, 2001 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Jul 2, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31938
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A film which is a single polymer film and has a smaller phase difference as the wavelength becomes shorter. This film is made from an olefin-based polymer which has an alicyclic group in the side chain, such as hydrogenated polystyrene, the amount of the alicyclic group in the side chain being 60 to 90 wt % based on the whole polymer, and satisfies the following expression:R(450)/R(550)<1wherein R(450) and R(550) are phase differences on the film plane at a wavelength of 450 nm and a wavelength of 550 nm, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.