High-haze calcite bopet composite diffusion film and preparation method and application thereof

By designing a gradient microporous-dense layer composite structure and dual-size calcite particles, the contradiction between high haze and light transmittance in the diffusion film is resolved, improving mechanical strength and optical performance, reducing production costs, and making it a high-performance diffusion film suitable for Mini-LED backlight technology.

CN120577905BActive Publication Date: 2025-11-07NINGBO CHANGYANG TECH
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Patent Information

Application Number
CN202511054923.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-30
Publication Date
2025-11-07
Estimated Expiration
2045-07-30

AI Technical Summary

Technical Problem

Existing diffusion films present a contradiction between high haze and high transmittance. Traditional inorganic particles cause color coordinate shift and uneven dispersion, have poor flexibility, and are costly, making it difficult to meet the requirements of ultra-thinness and high light density penetration performance of Mini-LED backlight technology.

Method used

A gradient microporous-dense layer composite structure is designed, using low-filling nano-calcite to construct a highly dense surface layer, combining dual-size calcite particles with micron particles to construct a multi-scale scattering network, optimizing the inorganic/organic interface through co-extrusion-biaxial stretching process, modifying calcite particles with silane coupling agent vapor injection process, and introducing nonionic antistatic agents and phosphite-hindered phenol complexes.

Benefits of technology

It achieves synergistic optimization of high haze and high transmittance, improves mechanical strength and optical performance, reduces production costs, and meets the needs of flexible display devices.

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Abstract

The present application relates to the technical field of optical functional film, disclose a kind of high haze calcite BOPET composite diffusion film and its preparation method and application, by adopting gradient micropore-dense layer composite structure design, and optimizing each layer function composition, on the one hand in surface dense layer, utilize low filling nano calcite to build high dense structure, effectively reduce surface light reflection, improve mechanical strength, while avoiding light transmittance loss;On the other hand in bottom microporous layer, introduce double-particle-size calcite particle nanoparticles and microparticles, build multiscale scattering network, realize the efficient light diffusion of wide spectral range 380-780 nm, significantly reduce interface scattering loss, substantially improve the light transmittance and haze balance of optical film;Meanwhile, through the integration of co-extrusion-biaxial stretching process, optimize inorganic / organic interface combination, effectively solve the problem of filler agglomeration, while reducing the preparation cost.
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