POLARIZATION PLATE AND MANUFACTURING METHOD THEREFORE

To provide a polarization plate in which discoloration never occurs even in an endurance test at a high temperature (105°C) for a long period (600 hours or longer).SOLUTION: A polarization plate has a single hue b value of 2.7 or more and an absorbance of 4.5 or less at a wavelength of 700 nm. Furth...

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Bibliographic Details
Main Authors CHIU I HSIN, HUANG I LING
Format Patent
LanguageEnglish
Japanese
Published 17.06.2021
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:To provide a polarization plate in which discoloration never occurs even in an endurance test at a high temperature (105°C) for a long period (600 hours or longer).SOLUTION: A polarization plate has a single hue b value of 2.7 or more and an absorbance of 4.5 or less at a wavelength of 700 nm. Further, it includes a polarizer, and a first thermoplastic resin film bonded to one side of the polarizer via an adhesive. Also, a method for manufacturing a polarization plate in which the polarizer contains a polyvinyl alcohol-based resin film, comprises a cleaning step of cleaning the polyvinyl alcohol-based resin film with a cleaning liquid, and not cleaning it with a cleaning liquid at a temperature above 22°C.SELECTED DRAWING: None 【課題】高温（１０５℃）および長時間（６００時間以上）での耐久試験においても変色が生じない偏光板を提供すること。【解決手段】単体色相ｂ値が２．７以上であり、および波長７００ｎｍにおける吸光度が４．５以下である偏光板。さらに、偏光子と、その片側に接着剤を介して貼合された第１熱可塑性樹脂フィルムとを備える。また、偏光板の製造方法であって、前記偏光子はポリビニルアルコール系樹脂フィルムを含み、前記ポリビニルアルコール系樹脂フィルムを洗浄液で洗浄する洗浄工程であって、２２℃を超える温度の洗浄液では洗浄しない洗浄工程を含む、偏光板の製造方法。【選択図】なし
Bibliography:Application Number: JP20190223527