Title:
POLARIZING FILM, POLARIZING PLATE, AND METHOD FOR MANUFACTURING POLARIZING FILM
Document Type and Number:
WIPO Patent Application WO/2019/054276
Kind Code:
A1
Abstract:
A polarizing film having excellent optical characteristics is provided. This polarizing film is composed of an iodine-containing polyvinyl alcohol resin film, the thickness of which is 8 μm or less and the orthogonal absorbance per μm of thickness at a wavelength 210 nm is 1.00 or less. Such a polarizing film is obtained by a manufacturing method that comprises: forming, into a laminate, a polyvinyl alcohol resin layer containing an iodide or sodium chloride and a polyvinyl alcohol resin on one side of, for example, an elongated thermoplastic resin substrate; and subjecting the laminate, in the stated order, to an in-air supplementary stretching process, a dying process, an underwater stretching process, and a shrink-drying process for causing 2% or more shrinkage in the width direction by heating while conveying in the longitudinal direction.
Inventors:
GOTO SHUSAKU (JP)
TAKAE KOSUKE (JP)
SHIMAZU RYO (JP)
TAKAE KOSUKE (JP)
SHIMAZU RYO (JP)
Application Number:
PCT/JP2018/033052
Publication Date:
March 21, 2019
Filing Date:
September 06, 2018
Export Citation:
Assignee:
NITTO DENKO CORP (JP)
International Classes:
G02B5/30; B29C55/06; B29L7/00; B29L9/00; B29L11/00
Domestic Patent References:
| WO2015137514A1 | 2015-09-17 | |||
| WO2012033153A1 | 2012-03-15 | |||
| WO2010061706A1 | 2010-06-03 | |||
| WO2016104741A1 | 2016-06-30 |
Foreign References:
| JP2015036729A | 2015-02-23 | |||
| JP2016138958A | 2016-08-04 | |||
| JP2016534414A | 2016-11-04 | |||
| JP2016173564A | 2016-09-29 | |||
| JP2013109090A | 2013-06-06 |
Attorney, Agent or Firm:
MOMII Takafumi (JP)
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