Uniaxially stretched multi-layer laminate film, polarizing plate comprising same, optical member for liquid crystal display device, and liquid crystal display device
US9519090B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2013 |
| Grant date | Dec 13, 2016 |
| Priority date | — |
| Expiry date | Nov 20, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/086
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A uniaxially stretched multi-layer laminate film that exhibits a high polarization performance of 99.5% or more in a simpler configuration than before, a polarizing plate that is composed of the same, an optical member for a liquid crystal display device, and a liquid crystal display device are provided. Namely, in the uniaxially stretched multi-layer laminate film in which a first layer and a second layer are alternately laminated, the uniaxially stretched multi-layer laminate film includes an intermediate layer that has a thickness of 2 μm or more and 30 μm or less; the first layer is composed of a polyester containing a naphthalene dicarboxylic acid ester; the second layer is composed of a copolymer polyester and is an optically isotropic layer that has an average refractive index of 1.50 or more and 1.60 or less; the first layer, the second layer, both first and second layers, or the intermediate layer contains a visible light absorbent, which has a weight loss of less than 10% when it is kept at 300° C. for 1 hour, in an amount of 200 ppm or more and 2500 ppm or less on the basis of the weight of the layer; the uniaxially stretched multi-layer laminate film has a polarization …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.