POLYVINYL ALCOHOL FILM AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2015/129538

A1

[Problem] To provide a polyvinyl alcohol (PVA) film that can be used to easily manufacture an optical film such as a polarized film having narrow color irregularities that do not stand out visually as irregularities and a method for manufacturing such a PVA film. [Solution] Provided are: a PVA film for which the maximum value of the distance between neighboring peaks is 6 cm or less in the distribution of the angles of an orientation axis, as determined by measuring the angles of the orientation axis within the surface of the film at a 0.8 mm pitch in the width direction of the film; and a method for manufacturing a PVA film that comprises a step in which, when a film-forming undiluted solution that contains PVA is extruded in a film form onto a support body from an extrusion opening of an extrusion device and dried to manufacture a PVA film, air is blown onto the extruded film at an airflow rate of 0.3-5 m/s within ten seconds or less immediately after extrusion.

FUJII EMI (JP)
KAZETO OSAMU (JP)

PCT/JP2015/054560

September 03, 2015

February 19, 2015

Click for automatic bibliography generation  

KURARAY CO (JP)

B29C41/24; C08J5/18; G02B5/30; B29K29/00; B29L7/00; B29L11/00

WO2013146146A1	2013-10-03
WO2013146147A1	2013-10-03
WO2012132984A1	2012-10-04
WO2013137056A1	2013-09-19
WO2014050696A1	2014-04-03

JP2006342236A	2006-12-21
JP2005324355A	2005-11-24
JP2001315144A	2001-11-13
JP2006027263A	2006-02-02

TSUJI YOSHIKO (JP)
Crossing Yoshiko (JP)

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