Optical-grade polyester film for polaroid release film and preparation method of optical-grade polyester film

By optimizing the composition and process of the optical grade polyester film for polarizer release film, combined with the steps of blend granulation, casting, rheology-induced directional crystallization and solvent annealing, the problems of difficulty in taking into account light transmittance, tear resistance strength and surface flatness in the prior art are solved, and efficient mechanical and optical performance are improved.

CN119978738APending Publication Date: 2025-05-13SHAOXING XIANGYU GREEN PACKING CO LTD
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Patent Information

Application Number
CN202510271444.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-08
Publication Date
2025-05-13

AI Technical Summary

Technical Problem

In the prior art, the transmittance, tear resistance strength and surface flatness of the polarizer release film are difficult to take into account. PET films produced by the traditional biaxial stretching method are difficult to achieve the goal of ultra-thinization, and there is a risk of fracture due to stress concentration. Although the strategy of new material modification can significantly enhance certain specific properties, it may sacrifice other aspects of performance.

Method used

An optical grade polyester film for polarizer release film is adopted, and its composition includes polyethylene terephthalate, bisphenol A polyester, N-alkylamide comonomer, pyridine derivative, organophosphate nucleating agent, sulfonate comonomer, antioxidant, etc. The composition and structure of the film are optimized through process steps such as blending granulation, extrusion casting, rheology-induced directional crystallization, metastable crystal regulation and solvent annealing.

Benefits of technology

It achieves a balance of high light transmittance, strong tear resistance and surface flatness, significantly improves the mechanical and optical properties of the film, and solves the problem of difficult to balance mechanical and optical properties in traditional technology.

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Abstract

The invention relates to the technical field of polaroid release films, and discloses an optical-grade polyester film for a polaroid release film and a preparation method of the optical-grade polyester film. 5%-10% of bisphenol A polyester; 8%-12% of an N-alkylamide comonomer, the carbon chain length of the N-alkylamide comonomer is C6-C18, and the molecular structure of the N-alkylamide comonomer comprises at least one carbonyl group and an amide group; the substituent group of the pyridine derivative is alkyl, fluoro, carboxyl or hydroxyl, and the carbon chain length of the substituent group is C1-C6; and 0.3%-0.6% of an organophosphate nucleating agent, wherein the nucleating agent is polyphosphate, phosphate or pyrophosphate. And an optimized rheology induced directional crystallization process is adopted, so that molecular chains of the thin film are more orderly arranged in the stretching process, and the technical effect of remarkably improving optical transparency is achieved.
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