Heat-Curable Polyester Ink Composition for Color Filter
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Solution Overview
Problem
Existing ink compositions for forming fine patterns in semiconductor and display devices lack sufficient heat resistance and storage stability, particularly when used in roll printing or inkjet printing, due to the random distribution of polymerizable functional groups in acrylic resins, which affects their developability and chemical resistance.
Innovation Solution
A heat-curable ink composition comprising a polyester resin derived from a diol compound and a polybasic acid anhydride, with a polyfunctional monomer and thermal polymerization initiator, which allows for regular distribution of ethylenically unsaturated groups, enhancing crosslinking and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If acrylic resin is prepared by random free-radical polymerization with ethylenically unsaturated groups introduced into acid groups, then polymerizable functional groups are introduced into the resin, but the proportion of acid groups decreases resulting in poor developability and poor heat/chemical resistance
Solution Approach 1:
The invention segments the polymerization process into two distinct stages: first forming the acrylic resin backbone with acid groups, then separately introducing ethylenically unsaturated groups through condensation reaction. This segmentation allows independent optimization of each functional group's proportion and distribution, resolving the contradiction between introducing polymerizable groups and maintaining developability.
Solution Approach 2:
The acrylic resin is first prepared with acid groups before introducing the ethylenically unsaturated groups. This preliminary action ensures that the resin maintains sufficient acid group content for good developability, while the subsequent condensation reaction with compounds containing ethylenically unsaturated groups and hydroxyl or carboxyl groups introduces crosslinking functionality without compromising the resin's fundamental properties.
2Manufacturing precision
If photopolymerizable photosensitive resin compositions are used in roll printing or inkjet printing, then precise patterns can be obtained, but additional exposure systems are required increasing cost and processing time
Solution Approach 1:
The invention replaces the photopolymerization mechanism (requiring exposure systems) with thermal polymerization. The acrylic resin composition contains ethylenically unsaturated groups that can undergo polymerization through thermal energy input instead of light exposure, eliminating the need for complex exposure systems while maintaining pattern formation capability.
Solution Approach 2:
The invention changes the activation parameter from light (photopolymerization) to heat (thermal polymerization). By incorporating ethylenically unsaturated groups into the acrylic resin, the material becomes capable of polymerization through thermal energy, fundamentally changing the processing parameter and eliminating the need for exposure equipment.
3Strength
If the proportion of polymerizable functional groups is increased in acrylic resin, then crosslinking is improved, but the proportion of acid groups decreases resulting in poor developability
Solution Approach 1:
The invention changes the method of introducing polymerizable groups from direct incorporation during acrylic resin formation to post-synthesis condensation reaction. This parameter change allows the acid groups to be fully formed first, ensuring good developability, and then introduces ethylenically unsaturated groups through condensation with compounds containing hydroxyl or carboxyl groups, achieving high crosslinking density without compromising developability.
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 ink composition exhibits improved heat resistance and chemical resistance, maintaining stability during storage and enabling long-term storage without the need for alkali development, while providing uniform matrix formation for color filters.
Implementation Method 1
a heat-curable ink composition comprising a polyester resin, a pigment, a polyfunctional monomer, a thermal polymerization initiator and a solvent
Data Source
AI summary
A heat-curable ink composition and a color filter produced using the ink composition are provided. The ink composition and the color filter are highly resistant to heat and chemicals due to the use of a polyester resin prepared by polycondensation. In addition, unreacted anhydride groups are removed using a monohydric alcohol in the preparation of the ink composition to make the ink composition and the color filter very stable during storage.