POLYVINYL ALCOHOL FILM

WIPO Patent Application WO/2015/076169

A1

[Problem] To provide a PVA film which itself has an excellent hue and from which a polarizing film can be easily produced, the polarizing film being capable of producing an LCD having excellent hues without requiring the use of an optical film having a low transmittance and being capable of producing an LCD having a bright screen. [Solution] A PVA film in which the minimum value of the following slopes is -0.84 to -0.783 N/mm2·sec. The slopes are obtained in the following manner: a sample having a dimension of 3 cm in the width direction and cut out of the PVA film is set in an Autograph so that the chuck-to-chuck distance is 1.5 cm and that the sample is stretched in the lengthwise direction; the sample is immersed in 30°C water for 1 minute and then stretched in the water in the lengthwise direction at a rate of 240 %/min; the chuck-to-chuck distance is fixed at the time when the stress reached 11.1 N/mm2; and the subsequent changes in stress with the lapse of time are measured to draw a graph by plotting time and stress as abscissa and ordinate, respectively, and the slopes at the points on the graph are determined.

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JP2008152120	OPTICAL FILM
JP4289615	Solution film forming method and polymer film

OZONO TATSUYA (JP)
TAKAFUJI MASAHIRO (JP)
KAZETO OSAMU (JP)

PCT/JP2014/080018

May 28, 2015

November 13, 2014

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KURARAY CO (JP)

G02B5/30; C08J5/18; G02F1/1335

WO2010071094A1	2010-06-24
WO2014050697A1	2014-04-03

JP2012082395A	2012-04-26
JP2009163202A	2009-07-23
JP2002169024A	2002-06-14
JP2004226707A	2004-08-12

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