A tough, resistive polymer dispersed liquid crystal film, coating composition and method of making

CN121871239BActive Publication Date: 2026-06-05SHANGHAI LONGSHENG PHOTOELECTRIC NEW MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI LONGSHENG PHOTOELECTRIC NEW MATERIAL CO LTD
Filing Date
2026-03-19
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing polymer-dispersed liquid crystal films are prone to irreversible finger-pressure discoloration marks under localized stress, affecting product yield and reliability. Current technologies have not been able to effectively solve this problem.

Method used

A reactive toughening agent is introduced into the PDLC coating composition. The first polyurethane acrylate oligomer with a hard-soft-hard or multi-segment block structure is covalently anchored in a three-dimensional cross-linked network to form a nanoscale micro-phase separation structure, which synergistically absorbs and disperses stress.

Benefits of technology

It significantly improves the toughness and compressive strength of PDLC films, avoids discoloration caused by finger pressure, improves product durability and production yield, and maintains optical transparency and electro-optical properties.

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Abstract

The application discloses a kind of toughening anti-fingerprint polymer dispersed liquid crystal film, coating composition and preparation method thereof, belong to polymer composite material and PDLC liquid crystal technical field.The polymer matrix of the PDLC film is three-dimensional crosslinking network, wherein reactive toughening agent is combined by covalent bond, the reactive toughening agent is first polyurethane acrylate oligomer with acrylate functional group at the end, number average molecular weight is 1500~10000, and functionality is 2~10.In curing process, reactive toughening agent is anchored to polymer network by covalent bond, and due to thermodynamic incompatibility of its flexible segment and acrylate monomer, it spontaneously phase separates to form 50~500 nm nanoscale flexible microzone, and constructs microphase separation structure.When PDLC film is subjected to local pressure, the structure can synergistically dissipate energy by inducing various mechanisms such as crazing, shear band, large deformation and crack pinning, thereby significantly improving the toughness and anti-fingerprint performance of the film layer.
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