Alkali-Developable Color Filter Resin Composition
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Solution Overview
Problem
Existing alkali-developable, colored photosensitive resin compositions for color filters have insufficient sensitivity, resolving power, and storage stability, leading to reduced productivity and poor adhesion to substrates, which are unsuitable for high-quality color filter production.
Innovation Solution
An alkali-developable, colored photosensitive resin composition is developed by incorporating a reaction product of an epoxy adduct and a polybasic acid anhydride, with specific ratios of unsaturated monobasic acid, phenol, alcohol, or amine compounds, and a photopolymerization initiator, enhancing sensitivity, resolving power, and adhesion to substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pigment or a dye is dispersed in high concentration in an alkali-developable photosensitive resin, then color purity and light shielding performance are improved, but sensitivity is reduced due to blocking of ultraviolet light necessary for patterning
Solution Approach 1:
The patent changes the chemical parameters of the resin composition by introducing a specific binder resin with carboxyl groups and controlling the acid value within 50-150 mg KOH/g. This parameter optimization allows the formulation to maintain high pigment concentration while preserving UV light transmission and photosensitivity, thereby resolving the contradiction between color purity and sensitivity
Solution Approach 2:
The patent creates a composite photosensitive resin composition by combining the binder resin containing the specific copolymer with pigments, dyes, and photopolymerization initiators. This composite structure enables the system to simultaneously achieve high color purity through concentrated coloring components and high sensitivity through the optimized resin matrix that facilitates UV light penetration
2Strength
If existing alkali-developable photosensitive resin compositions are used, then adhesion to substrates is achieved, but sensitivity and resolving power are insufficient for forming proper patterns
Solution Approach 1:
The patent optimizes the acid value parameter of the binder resin to a specific range (50-150 mg KOH/g) and controls the carboxyl group content, which simultaneously improves both adhesion strength to substrates and the resolving power for fine pattern formation. This parameter optimization ensures that the resin maintains appropriate chemical reactivity and physical properties for high-quality photopatterning
3Productivity
If polyfunctional thiol compound is used as an essential component, then photosensitivity is improved, but smell and storage stability deteriorate
Solution Approach 1:
The patent replaces the polyfunctional thiol compound with alternative photopolymerization initiators that do not require long-term storage stability and are less prone to degradation. This substitution allows the system to achieve the required photosensitivity without the harmful side effects of thiol compounds, effectively treating the initiator as a consumable component that is activated during the exposure process
Solution Approach 2:
The patent introduces a binder resin containing a specific copolymer with carboxyl groups as an intermediary medium that facilitates the photopolymerization process. This intermediary resin matrix enables effective UV light absorption and polymerization initiation without requiring the addition of polyfunctional thiol compounds, thereby eliminating the smell and storage stability issues while maintaining photosensitivity
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 achieves high sensitivity, resolving power, and storage stability, with excellent adhesion to substrates and alkali resistance, enabling the production of high-quality color filters with improved productivity.
Implementation Method 1
Capable of curing by polymerization on being irradiated with ultraviolet light or an electron beam
Data Source
AI summary
An alkali-developable, colored photosensitive resin composition obtained by adding a colorant and a photopolymerization initiator to an alkali-developable resin composition, containing a reaction product obtained by esterification between an epoxy adduct and a polybasic acid anhydride, the epoxy adduct having a structure formed by adding an unsaturated monobasic acid and a compound selected from a phenol compound, an alcohol compound, an amine compound, and a carboxylic acid to an epoxy resin represented by general formula. The epoxy adduct is formed by adding 0.1 to 1.0 carboxyl group of the unsaturated monobasic acid and 0 to 0.9 phenolic hydroxyl group, alcoholic hydroxyl group, amino group or carboxyl group per epoxy group of the epoxy resin, with the sum of the carboxyl unsaturated monobasic acid and the phenolic hydroxyl group, alcoholic hydroxyl, amino or carboxyl group being 0.1 to 1.0 per epoxy group.