Polyester film and polarizing plate comprising same

CN119535664AActive Publication Date: 2025-02-28NITTO DENKO CORP
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Patent Information

Application Number
CN202411563970.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2019-05-23
Filing Date
2019-11-05
Publication Date
2025-02-28
Estimated Expiration
2039-11-05

AI Technical Summary

Technical Problem

The existing polyester film is prone to rainbow spots in image display devices, and it is prone to cause cracks in polarizers when temperature changes, affecting its durability.

Method used

A polyester film with an in-plane phase difference Re (590) of less than 100 nm and a linear expansion coefficient in the first direction is 0/℃ to 4.0×10-5/℃, and the crystallinity and orientation function of the polyester film are controlled by modifying polyethylene terephthalate and improving the stretching process to reduce the occurrence of rainbow spots and improve the durability of the polarizing plate.

Benefits of technology

It effectively reduces the occurrence of rainbow spots in the image display device, and improves the durability of the polarizer, preventing cracks from occurring when the temperature changes.

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Abstract

Provided are: a polyester film which exhibits little generation of rainbow spots when applied to an image display device and contributes to improvement of the durability of a polarizing plate; and a polarizing plate comprising the polyester film. This polyester film has an in-plane phase difference Re (590) of 100 nm or less and a linear expansion coefficient in a first direction of 0 / DEG C to 4.0 * 10-5 / DEG C. In one embodiment, the absolute value of the difference between the linear expansion coefficient in the first direction and the linear expansion coefficient in a second direction orthogonal to the first direction is 1.0 * 10 <-5 > / DEG C or less.
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Citation Information

Patent Citations

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    CN107852786A

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    CN108474892A

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