Oxime-Ester Photoinitiator for High-Speed LCD Curing
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Solution Overview
Problem
Existing oxime ester photoinitiators in photosensitive compositions face issues with stability, solubility, and compatibility with LED and laser light sources, leading to poor photosensitivity, developability, and resolution in liquid crystal display applications, which limits their efficiency and precision.
Innovation Solution
A photosensitive composition comprising 20-60 parts of ultraviolet photosensitive prepolymer resin, 10-30 parts of active diluent monomer, and 1-5 parts of an oxime ester photoinitiator, specifically bisoxime ester compounds, which are prepared by reacting oxime compounds with acid anhydride or acid chloride, along with additional photopolymerization initiators and additives, to enhance curing speed, reduce energy consumption, and improve film clarity and pattern integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oxime ester photoinitiators are used in photosensitive compositions, then photosensitive property is improved, but stability and solubility deteriorate
Solution Approach 1:
The patent modifies the molecular structure of oxime ester photoinitiators by introducing specific substituents (electron-withdrawing groups like CF3, F, Cl, and electron-donating groups like OCH3, CH3) at defined positions (R1-R7) to optimize the balance between photosensitivity and stability. This structural parameter adjustment allows the photoinitiator to maintain high photosensitive activity while achieving improved storage stability and solubility in the photosensitive composition.
2Reliability
If conventional photoinitiators are used, then general photosensitivity is achieved, but compatibility with LED dot light sources and laser light sources deteriorates
Solution Approach 1:
The patent designs photoinitiators with specific absorption wavelength characteristics by selecting appropriate substituents and molecular frameworks. The structural modifications enable the photoinitiators to absorb light efficiently in the wavelength ranges emitted by LED dot light sources and laser light sources, achieving high photosensitivity under these specific light sources while maintaining broad adaptability.
3Productivity
If existing photosensitive compositions are used, then basic curing function is achieved, but curing speed and exposure dose efficiency deteriorate
Solution Approach 1:
The patent optimizes the photoinitiator structure to maximize light absorption efficiency and radical generation capability. By introducing specific functional groups and adjusting molecular configuration, the photoinitiators achieve high quantum efficiency, enabling fast curing speeds with reduced exposure doses. This results in improved productivity and energy efficiency in the photocuring process.
4Productivity
If conventional photoinitiators are used in colored systems, then basic photocuring is achieved, but photosensitivity, developability, and resolution effect deteriorate
Solution Approach 1:
The patent designs photoinitiators with optimized molecular structures that maintain high photosensitivity and resolution capability even in the presence of dyes and pigments. The structural modifications enable the photoinitiators to function effectively in colored photosensitive compositions, achieving good developability and resolution effects while maintaining high production efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition exhibits superior curing speed, low pollution, and high sensitivity to LED and laser light sources, resulting in films with excellent thickness, clarity, and pattern integrity, suitable for liquid crystal display applications such as color filters and photospacers, with reduced exposure dose and improved precision and durability.
Implementation Method 1
A photosensitive composition containing an oxime ester photoinitiator, comprising the following components: (A) 20-60 parts by mass of an ultraviolet photosensitive prepolymer resin; (B) 10-30 parts by mass of an active diluent monomer; (C) 1-5 parts by mass of an oxime ester photoinitiator
Data Source
AI summary
Provided is a photosensitive composition containing an oxime-ester photoinitiator. The oxime-ester photoinitiator is a compound as shown in formula (I). The composition has the advantages of high curing speed, small exposure dose, less pollution, energy saving, almost no residue defect, etc., and the thickness, clarity and pattern integrity of a cured film thereof are all excellent.