Title:
METHOD FOR PRODUCING POLARIZING FILM
Document Type and Number:
WIPO Patent Application WO/2018/016542
Kind Code:
A1
Abstract:
Provided is a method for producing a polarizing film, in which a polyvinyl alcohol film is subjected to at least a swelling step, a dyeing step, and a stretching step, wherein a stretched film is produced using, as a starting material, a polyvinyl alcohol film having a dry film thickness B between 0.001-0.045 mm inclusive, and in at least one of said steps, following immersion of the polyvinyl alcohol film in water, when the film is taken out of the water and water adhering to both ends of the film is removed from both surfaces thereof, a distance A from a position at which the film is taken out of the water to a position at which the water is removed is set to 28 mm or less. This production method enables easy production of a polarizing film having excellent polarization performance, and is less likely to cause damage to a film during stretching or drying even when a thin polyvinyl alcohol film is used.
Inventors:
KAWASAKI EMI (JP)
KAZETO OSAMU (JP)
KAZETO OSAMU (JP)
Application Number:
PCT/JP2017/026159
Publication Date:
January 25, 2018
Filing Date:
July 19, 2017
Export Citation:
Assignee:
KURARAY CO (JP)
International Classes:
G02B5/30
Foreign References:
| JP2015102615A | 2015-06-04 | |||
| JP2004109698A | 2004-04-08 | |||
| JP2013033154A | 2013-02-14 | |||
| JP2016126021A | 2016-07-11 |
Attorney, Agent or Firm:
SETOUCHI INTERNATIONAL PATENT FIRM (JP)
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