To provide a manufacturing method of a polarization film particularly allowing a reduced shrinkage ratio of the direction orthogonal to an absorption axis when the polarization film is exposed to high-temperature condition and also having excellent dyeability.
A polarization film 9 is manufactured by passing a polyvinyl alcohol resin rolled film 1 through a swelling tank 3, a dyeing tank 4 and a boric acid tank 5 in this order to successively treat and by uniaxially stretching in at least one of the dyeing tank 4 and the boric acid tank 5. In the swelling tank 3, swelling treatment is conducted while uniaxially stretching the polyvinyl alcohol resin rolled film 1 and the stretching ratio in the swelling tank 3 to the total stretching ratio before the polarization film 9 is obtained from the rolled film 1 is 50% or more. A transparent protective film is laminated to at least one side the obtained polarization film 9 to produce a polarizer.
TAZAKI MAKOTO
HIGO ATSUSHI
| JP2006065309A | 2006-03-09 | |||
| JP2010033007A | 2010-02-12 | |||
| JP2009009111A | 2009-01-15 |
Toru Sakamoto
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