Optical film, polarizing plate, and VA-mode liquid crystal display device
US8368858B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2009 |
| Grant date | Feb 5, 2013 |
| Priority date | — |
| Expiry date | Aug 23, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to an optical film produced by stretching a film having a low residual solvent amount in a machine direction followed by heat-treating it at a temperature falling from the glass transition point (Tg) to the melting point (Tm) thereof, which is a cellulose acylate film satisfying the following relations (1) to (6) and containing at least one cellulose acylate and at least one retardation enhancer having an absorption maximum wavelength λmax of from 280 nm to 380 nm: (1) 35 nm≦Re(550)≦75 nm, (2) 85 nm≦Rth(550)≦140 nm, (3) 0 nm<ΔRe(630−450)≦40 nm, (4) −75 nm≦ΔRth(630−450)<0 nm, (5) 2.7≦A+B≦3.0, and (6) B≧0, wherein “A” means a degree of substitution with an acetyl group of said at least one cellulose acylate, and “B” means a degree of substitution with an acyl group having at least 3 carbon atoms thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.