Curable Composition for Color Filters with Enhanced Adhesiveness
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Solution Overview
Problem
In the production of color filters for liquid crystal displays and solid-state imaging devices, the increasing demand for finer patterns and higher image quality leads to challenges in achieving sufficient adhesiveness and reducing development residues, particularly with the limited content ratios of photopolymerization initiators and photopolymerizable monomers, which affects the formation of desired patterns and noise reduction.
Innovation Solution
A curable composition comprising specific polymerizable compounds with alkyleneoxy groups, an i-line absorber, photopolymerization initiator, alkali-soluble resin, and pigment, with a mass ratio of (A)/(A)+(B) from 0.6 to 0.8, forming a coating film with i-line transmittance of 10% or less, enhances adhesiveness and reduces development residues, suitable for high illuminance exposure applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pigment concentration is increased to enhance color purity and contrast, then color quality is improved, but adhesiveness to inorganic substrate becomes insufficient
Solution Approach 1:
The patent changes the chemical parameters of the curable composition by introducing specific polymerizable compounds with hydroxyl groups (formula 1) and carboxyl groups (formula 2) that can chemically bond to inorganic substrates. This parameter change allows the composition to maintain both high pigment concentration for color purity and sufficient adhesiveness to the substrate through chemical bonding mechanisms.
Solution Approach 2:
The patent creates a composite curable composition that integrates multiple functional components: polymerizable compounds with bonding groups (formulas 1 and 2), photopolymerization initiators, pigments, and optional silane coupling agents. This composite material structure enables simultaneous achievement of color purity through high pigment content and adhesiveness through the bonding-capable polymerizable compounds.
2Manufacturing precision
If pigment particles are made finer to enhance contrast, then image quality is improved, but the proportion of pigment dispersant increases, reducing photopolymerization initiator and monomer content
Solution Approach 1:
The patent changes the chemical structure parameters of the polymerizable compounds to include bonding groups (hydroxyl in formula 1, carboxyl in formula 2) that provide substrate adhesion functionality. This structural parameter change allows the system to use finer pigment particles for enhanced contrast while compensating for the increased dispersant requirement through the inherent bonding capability of the polymerizable compounds, thus maintaining sufficient photopolymerization initiator content.
3Quantity of substance
If content ratio of photopolymerization initiator and photopolymerizable monomer is limited, then pigment concentration can be increased, but formation of desired pattern becomes difficult
Solution Approach 1:
The patent changes the functional parameters of the polymerizable compounds by incorporating bonding groups (hydroxyl in formula 1, carboxyl in formula 2) that enhance substrate interaction. This parameter change improves pattern formation capability through better substrate adhesion and wetting, allowing the system to maintain high pigment concentration while achieving desired pattern fidelity through the enhanced interfacial properties provided by the bonding groups.
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 curable composition effectively enhances adhesiveness for forming fine patterns with reduced development residues and noise, achieving excellent color reproducibility and resolving power comparable to low illuminance exposure conditions, even under high illuminance.
Implementation Method 1
a curable composition comprising (A) a polymerizable compound having an alkyleneoxy group having two or more carbon atoms... (D) a photopolymerization initiator
Implementation Method 2
when the curable composition is formed into a coating film having a thickness of 0.7 μm, the i-line transmittance prior to exposure is 10% or less
Data Source
AI summary
A curable composition containing (A) a polymerizable compound having an alkyleneoxy group having two or more carbon atoms, (B) a polymerizable compound lacking an alkyleneoxy group having two or more carbon atoms, (C) an i-line absorber, (D) a photopolymerization initiator, (E) an alkali-soluble resin, and (F) a pigment, wherein a mass ratio [(A)/((A)+(B))] is from 0.5 to 0.9, and an i-line transmittance obtainable when the curable composition is formed into a coating film having a thickness of 0.7 µm, is 10% or less. The curable composition of the invention has enhanced adhesiveness upon forming a micro pattern, and can reduce development residues in unexposed non-cured areas. The curable composition of the invention is suitable for the use in color filters.