Title:
POLARIZING PLATE MANUFACTURING METHOD, IMAGE DISPLAY DEVICE MANUFACTURING METHOD, AND METHOD FOR ADJUSTING TRANSMITTANCE OF POLARIZING FILM
Document Type and Number:
WIPO Patent Application WO/2022/158088
Kind Code:
A1
Abstract:
The present invention provides a method for adjusting the transmittance of a polarizing film after producing the same. A polarizing plate manufacturing method according to the present invention comprises, in the order given, a step for obtaining a primary polarizing film by subjecting a polyvinyl alcohol–based resin film to a dyeing treatment and to a stretching treatment in a boric acid aqueous solution and thereafter drying the film until the moisture content reaches 15 wt% or less, and a step for obtaining a secondary polarizing film by bringing the surface of the primary polarizing film into contact with an aqueous solvent and thereby altering the transmittance of the film.
Inventors:
GOTO SHUSAKU (JP)
Application Number:
PCT/JP2021/041182
Publication Date:
July 28, 2022
Filing Date:
November 09, 2021
Export Citation:
Assignee:
NITTO DENKO CORP (JP)
International Classes:
G02B5/30; B29C55/02; G02F1/1335; H01L27/32; H01L51/50; H05B33/02; H05B33/10
Domestic Patent References:
| WO2020066125A1 | 2020-04-02 | |||
| WO2019235107A1 | 2019-12-12 | |||
| WO2015163401A1 | 2015-10-29 |
Foreign References:
| JP2016027136A | 2016-02-18 |
Attorney, Agent or Firm:
MOMII Takafumi (JP)
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