Polyvinyl alcohol-based polymer film and manufacturing process therefor

To provide a polyvinyl alcohol (PVA) film capable of yielding an optical film such as a polarizing film which exhibits little color irregularity even in a case wherein the light transmittance of the film is high or in a case wherein a backlight having a higher intensity is used. A PVA film in which...

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Bibliographische Detailangaben
Hauptverfasser:	KATSUNO RYOJI, FUJII EMI, KAZETO OSAMU, HAMADA ATSUSHI, HIKASA SHINTARO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS METALLURGY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	To provide a polyvinyl alcohol (PVA) film capable of yielding an optical film such as a polarizing film which exhibits little color irregularity even in a case wherein the light transmittance of the film is high or in a case wherein a backlight having a higher intensity is used. A PVA film in which when the in-plane orientation axes of the film are measured at 20-mm pitches in the widthwise direction of the film, all the angles (within a range of 0 to 90o) between orientation axes which are observed at each pair of adjacent measuring positions are 2.3 DEG or less. In the PVA film, it is preferable that the average of the angles between orientation axes which are observed at each pair of adjacent measuring positions is 0.6 DEG or less.