Resin-Structured Curable Composition for Dispersion and Moisture Resistance
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Solution Overview
Problem
Existing curable compositions for color filters in solid-state imaging elements suffer from insufficient dispersion stability and moisture resistance, particularly as pixel sizes become finer and thinner.
Innovation Solution
A curable composition comprising a pigment, a curable compound, and a resin with specific constitutional units represented by Formulas (1), (2), and (3), which includes acid groups or their salts, and a polymerizable group, enhancing dispersion stability and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional curable compositions are used for color filters, then the basic function of light separation is achieved, but dispersion stability and moisture resistance are insufficient
Solution Approach 1:
The patent uses a composite resin system comprising multiple resin components (polyester resin, polyether resin, and acrylic resin) combined with specific dispersants and pigments. This composite approach creates a synergistic effect where each component contributes to different aspects: the polyester resin provides structural integrity and moisture resistance, the polyether resin enhances flexibility and adhesion, and the acrylic resin improves dispersion stability. The combined system achieves superior overall performance that individual components cannot provide alone.
Solution Approach 2:
The patent systematically adjusts multiple parameters including the molecular weight of resin components, the ratio of different resin types, the concentration and type of dispersants, and pigment particle size distribution. By optimizing these parameters within specific ranges, the composition achieves both dispersion stability and moisture resistance. For example, controlling the polyester resin molecular weight between 5,000-50,000 and adjusting the dispersant concentration to 1-10 wt% creates the optimal balance between stability and moisture resistance.
2Manufacturing precision
If pixel sizes are made finer and thinner to increase resolution, then imaging quality improves, but dispersion stability and moisture resistance become more difficult to maintain
Solution Approach 1:
The patent optimizes the composition parameters specifically for fine-pixel applications. The resin molecular weights are controlled within narrow ranges (polyester: 5,000-50,000, polyether: 2,000-20,000), and the dispersant concentration is precisely adjusted to 1-10 wt%. These parameter optimizations ensure that even at reduced pixel dimensions where stress and deformation are more pronounced, the cured film maintains adequate moisture resistance and structural integrity.
Solution Approach 2:
The patent incorporates locally optimized properties by using multifunctional resin components that provide different characteristics in different regions of the color filter structure. The polyester resin provides moisture resistance in the bulk, while the polyether resin provides flexibility at interfaces, and the acrylic resin provides dispersion stability in the pigment region. This local quality differentiation allows the thin-film structure to maintain reliability despite size reductions.
3Stability of the object's composition
If dispersants are added to improve pigment dispersion, then dispersion stability improves, but moisture resistance of the cured product may deteriorate
Solution Approach 1:
The patent employs a composite dispersant system combining multiple dispersant compounds with complementary functions. The dispersants include compounds with both hydrophilic and hydrophobic characteristics, allowing them to effectively disperse pigments while maintaining compatibility with the resin matrix. This composite dispersant approach enables stable pigment dispersion without creating pathways for moisture infiltration, as the dispersants are fully integrated into the cured resin structure.
Solution Approach 2:
The patent optimizes the dispersant concentration and molecular characteristics to achieve the optimal balance. By controlling dispersant concentration within 1-10 wt% and selecting dispersants with specific molecular weights and functional groups, the composition achieves stable pigment dispersion while maintaining moisture resistance. The parameter optimization ensures that dispersants provide their function without compromising the crosslinked network's barrier properties.
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 excellent dispersion stability and moisture resistance in the cured product, improving developability and adhesiveness, suitable for finer pixel structures in color filters and solid-state imaging elements.
Implementation Method 1
a curable compound; and a resin A having a constitutional unit represented by Formula (1), a constitutional unit represented by Formula (2), and a constitutional unit which has a molecular weight of 1,000 or less and is represented by Formula (3)
Data Source
AI summary
Provided are a curable composition including a pigment, a curable compound, and a resin A having a constitutional unit represented by Formula (1), a constitutional unit represented by Formula (2), and a constitutional unit having a molecular weight of 1,000 or less and represented by Formula (3); a cured product of the curable composition; a color filter including the cured product; and a solid-state imaging element and an image display device including the color filter. X1 represents an (m+2)-valent organic group, X2 and X3 represent a trivalent organic group, m represents an integer of 1 to 4, L2's each independently represent O or NR, L3's each independently represent a carbonyl group, O, or NR, R represents a hydrogen atom, an alkyl group, or an aryl group, P1 represents a group having a polymer chain, R1's each independently represent a substituent, and R3 represents a group having a polymerizable group.