Title:
POLYVINYL ALCOHOL FILM, POLARIZING FILM AND POLARIZING PLATE, AND POLYVINYL ALCOHOL FILM PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2018/199139
Kind Code:
A1
Abstract:
A polyvinyl alcohol film which has an excellent balance of swelling properties and stretching properties during polarizing film manufacture, does not result in rupture during thin polarizing film production, and enables obtaining a polarizing film that exhibits high polarization performance and has few color irregularities, a polarizing film and polarizing plate using said polyvinyl alcohol film, and a polyvinyl alcohol film production method are provided. This polyvinyl alcohol film is elongate and 5-60 μm thick, and is characterized by satisfying all of the expressions (A) to (C) below when ΔnMDA is defined as the birefringence in the length direction (MD) of a first surface, ΔnMDB is defined as the birefringence in the length direction (MD) of a second surface, and ΔnMDC is defined as the birefringence of the center portion in the thickness direction. (A)... 1.0 ≤ ΔnMDA / ΔnMDB ≤ 1.5 (B)... ΔnMDB - ΔnMDC ≥ 0.2×10-3 (C)...ΔnMDA≥3.0×10-3
More Like This:
Inventors:
SHIMIZU TOSHIHIRO (JP)
KITAMURA SHUICHI (JP)
TERAMOTO YUUICHI (JP)
KITAMURA SHUICHI (JP)
TERAMOTO YUUICHI (JP)
Application Number:
PCT/JP2018/016752
Publication Date:
November 01, 2018
Filing Date:
April 25, 2018
Export Citation:
Assignee:
NIPPON SYNTHETIC CHEM IND CO LTD (JP)
International Classes:
G02B5/30; B29C55/08; C08J5/18; B29K29/00; B29L7/00; B29L11/00
Domestic Patent References:
| WO2010071094A1 | 2010-06-24 | |||
| WO2016068152A1 | 2016-05-06 | |||
| WO2013137056A1 | 2013-09-19 | |||
| WO2016084836A1 | 2016-06-02 |
Foreign References:
| JP2005324355A | 2005-11-24 | |||
| JP2012128144A | 2012-07-05 | |||
| JP2012058383A | 2012-03-22 | |||
| JP2004361787A | 2004-12-24 | |||
| JP2009230115A | 2009-10-08 | |||
| JP2013011872A | 2013-01-17 | |||
| JP2013137357A | 2013-07-11 |
Attorney, Agent or Firm:
SAITOH Yukihiko et al. (JP)
Download PDF: