ポリエステルフィルム、および該ポリエステルフィルムを含む偏光板

JP7891952B2Active Publication Date: 2026-07-17NITTO DENKO CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
NITTO DENKO CORP
Filing Date
2023-08-08
Publication Date
2026-07-17

AI Technical Summary

Benefits of technology

【0007】 本発明によれば、所定方向の線膨張係数を選択的に小さくすることにより、偏光子と組み合わせた際の虹ムラの発生が少なく、かつ、偏光板の耐久性向上に寄与し得るポリエステルフィルムを提供することができる。

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Abstract

To provide a polyester film that reduces the occurrence of rainbow unevenness when applied to an image display device, and can contribute to an improvement in the durability of a polarizing plate.SOLUTION: A polyester film has a coefficient of linear expansion of 3.0×10-5 / °C or less in a first direction, and a coefficient of linear expansion of 3.5×10-5 / °C to 7.5×10-5 / °C in a second direction orthogonal to the first direction, and has a slow axis in a direction of -5° to 5° with respect to the first direction.SELECTED DRAWING: None
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