Title:
POLYVINYL ALCOHOL FILM, POLARIZING FILM USING SAME, AND POLARIZING PLATE
Document Type and Number:
WIPO Patent Application WO/2022/145489
Kind Code:
A1
Abstract:
Provided are a PVA film whereby unevenness in a polarizing plate when the PVA film is stretched is hardly visible even when transmission of an LCD is increased, a polarizing film that uses such a PVA film, and a polarizing plate. A polyvinyl alcohol film in which, when F0(x) is defined as a film thickness profile for arbitrary points F0 on the film surface, F-100(x) is defined as a film thickness profile for points -100 mm in the TD direction from F0, F-200(x) is defined as a film thickness profile for points -200 mm in the TD direction from F0, F+100(x) is defined as a film thickness profile for points +100 mm in the TD direction from F0, and F+200(x) is defined as a film thickness profile for points +200 mm in the TD direction from F0, the average slope value represented by the average in the MD direction of F'0(x), F'-100(x), F'-200(x), F'+100(x), and F'+200(x), which are slope values in the MD direction of the respective film thickness profiles, is 0.02 or less, and a phase parameter defined by the average value of |F'-100(Cn)-F'0(Cn)|, |F'-200(Cn)-F'0(Cn)|, |F'+100(Cn)-F'0(Cn)|, and |F'+200(Cn)-F'-0(Cn)|, where Cn (n = 1, 2, 3, . . .) is the point at which F'0(x) is at a minimum value, is 0.015 or greater.
More Like This:
| WO/2012/132347 | POLARIZING PLATE ATTACHING DEVICE |
| WO/2020/004323 | POLARIZING FILM AND METHOD FOR MANUFACTURING SAME |
| WO/2020/184587 | POLYVINYL ALCOHOL FILM, POLARIZING FILM, AND POLARIZING PLATE |
Inventors:
SHIMODA KOHEI (JP)
MORI SHOTARO (JP)
OHASHI WATARU (JP)
NAKAI SHINJI (JP)
MORI SHOTARO (JP)
OHASHI WATARU (JP)
NAKAI SHINJI (JP)
Application Number:
PCT/JP2021/049005
Publication Date:
July 07, 2022
Filing Date:
December 28, 2021
Export Citation:
Assignee:
KURARAY CO (JP)
International Classes:
G02B5/30; B29C55/04; C08J5/18
Domestic Patent References:
| WO2013146147A1 | 2013-10-03 |
Foreign References:
| JP2005324355A | 2005-11-24 | |||
| JP2001315141A | 2001-11-13 | |||
| KR20080098809A | 2008-11-12 |
Attorney, Agent or Firm:
LIGHTHOUSE INTERNATIONAL PATENT FIRM (JP)
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