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Title:
METHOD FOR PRODUCING POLY(VINYL ALCOHOL) FILM
Document Type and Number:
WIPO Patent Application WO/2021/187310
Kind Code:
A1
Abstract:
Provided is a method for producing a PVA film in which worsening of streak-like defects can be suppressed when a PVA film is continuously produced. It is possible to continuously produce a PVA film in which an increase in the number of streak-like defects is suppressed by means of this method for producing a poly(vinyl alcohol) film, which includes a step for discharging a film-forming stock solution, which contains a nitrogen-containing non-ionic surfactant at a quantity of 0.10-0.30 parts by mass relative to 100 parts by mass of poly(vinyl alcohol), from a film-forming extrusion molding device, and in which the content of the nitrogen-containing non-ionic surfactant relative to the poly(vinyl alcohol) in the film-forming stock solution is increased over time before the stock solution is discharged in the discharging step.

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Inventors:
SATO KODAI (JP)
HIGUCHI YUTA (JP)
TAKAFUJI MASAHIRO (JP)
Application Number:
PCT/JP2021/009771
Publication Date:
September 23, 2021
Filing Date:
March 11, 2021
Export Citation:
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Assignee:
KURARAY CO (JP)
International Classes:
B29C41/24; C08J5/18; C08L29/04; B29K29/00; B29L7/00; G02B5/30
Domestic Patent References:
WO2019244968A12019-12-26
Foreign References:
JP2016222834A2016-12-28
JP2017213878A2017-12-07
Attorney, Agent or Firm:
AMANO Kazunori (JP)
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