Polarizing film, optical film laminate including polarizing film, and method for manufacturing the same
US8771454B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 2011 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Nov 3, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical film laminate includes a substrate including a crystallizable ester type thermoplastic resin in the form of a continuous web; and a polarizing film including a polyvinyl alcohol type resin layer formed on the substrate, said polarizing film including a dichroic material impregnated therein in a molecularly oriented state, wherein the polarizing film is formed by providing a laminate including the polyvinyl alcohol type resin layer formed on a substrate including a crystallizable ester type thermoplastic resin in an amorphous state and subjecting the laminate to a 2-stage stretching process including a preliminary in-air stretching and an in-boric-acid-solution stretching under a temperature maintaining the amorphous state of the substrate, such that the polyvinyl alcohol type resin layer is stretched to a thickness of 10 μm or less, the polarizing film having optical properties based on the formulae P>−(100.929T−42.4−1) ×100 (where T<42.3) and P≧99.9 (where T≧42.3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.