PVA optical film and its preparation method, and high-transmittance, high-polarization polarizer

By controlling the in-plane refractive index difference ΔNxy and swelling degree of the PVA optical film, and combining specific process parameters, a polarizer with high transmittance and high polarization degree was prepared, which solved the problems of poor transmittance and polarization degree in the existing technology and avoided the problems of film breakage and excessive internal stress during the stretching process.

CN121379003BActive Publication Date: 2026-05-26ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD +1
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Patent Information

Application Number
CN202511949527.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-23
Publication Date
2026-05-26
Estimated Expiration
2045-12-23

AI Technical Summary

Technical Problem

Existing technologies cannot simultaneously improve the transmittance and polarization degree of PVA optical films, and methods that increase molecular weight are prone to problems such as excessive tensile tension, film breakage, and excessive internal stress.

Method used

By controlling the in-plane refractive index difference ΔNxy of the PVA optical film to be 1×10-4~20×10-4, increasing the pre-oriented molecular chain structure, reducing the random molecular chain content, and using specific swelling degree and swelling rate, combined with multi-stage drying and heat treatment, a high-transmittance, high-polarization polarizer is prepared.

Benefits of technology

The polarizer achieved a transmittance of ≥44.0% and a polarization degree of ≥99.990%, solving the problems of poor transmittance and polarization degree, while avoiding the problems of film breakage and excessive internal stress during the stretching process.

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Abstract

This invention discloses a PVA optical film, its preparation method, and a high-transmittance, high-polarization polarizer, belonging to the field of PVA optical film manufacturing technology. This invention achieves this by controlling the in-plane refractive index difference ΔN of the PVA optical film. xy 1×10 ‑4 ~20×10 ‑4 The equilibrium swelling degree is 180% to 220%, and the average swelling rate is 90% to 110% / min. This gives the PVA optical film a pre-oriented molecular chain structure and increases the number of physical entanglement points in the crystal. Compared with the method of increasing the molecular weight of PVA optical film, the PVA optical film of the present invention can form more oriented polyiodide ions during the downstream stretching process of preparing polarizers, increasing the number of oriented polyiodide ions, reducing the content of random molecular chains, and reducing the orientation relaxation caused by molecular chain movement. This can simultaneously and greatly improve the polarization degree and transmittance of the polarizer.
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