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Title:
POLARIZING MEMBRANE PRODUCTION METHOD AND POLARIZING FILM PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2021/054356
Kind Code:
A1
Abstract:
A polarizing membrane production method that includes: a step (I-1) in which at least a staining process, a cross-linking process, and an extending process are applied to a polyvinyl alcohol-based film, while the polyvinyl alcohol-based film is transported in the longitudinal direction, and a water-containing polarizing membrane is produced; a step (I-2) in which a liquid coating process is applied to the water-containing polarizing membrane and a polarizing membrane impregnated with components in the liquid is produced; and a step (I-3) in which a drying process is applied to the obtained polarizing membrane impregnated with the components in the liquid and a dried polarizing membrane is produced. The water-containing polarizing membrane has a contact angle for the liquid that is no more than 55°. This production method for a polarizing membrane can easily and sufficiently impregnate the polarizing membrane with any component.

Inventors:
KURODA TAKUMA (JP)
YAMASHITA TOMOHIRO (JP)
YAGI SHIOMI (JP)
TAKADA KATSUNORI (JP)
MIYAZAKI MAKOTO (JP)
Application Number:
PCT/JP2020/035063
Publication Date:
March 25, 2021
Filing Date:
September 16, 2020
Export Citation:
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Assignee:
NITTO DENKO CORP (JP)
International Classes:
G02B5/30; G02F1/1335
Domestic Patent References:
WO2019103003A12019-05-31
WO2019177134A12019-09-19
Foreign References:
JP2013178356A2013-09-09
JP2017126038A2017-07-20
JP2015180910A2015-10-15
JP2008046257A2008-02-28
Attorney, Agent or Firm:
UNIUS PATENT ATTORNEYS OFFICE (JP)
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