Colored Curable Composition Pigment Dispersion Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing colored curable compositions for liquid crystal displays and solid image pickup elements face challenges in achieving high sensitivity and developability while maintaining high pigment concentration, leading to issues with film thinning and color uniformity due to the limited content of photopolymerizable components and polymerization inhibitors.
Innovation Solution
A colored curable composition comprising a pigment dispersion with a compound having a pigment skeletal structure and an amino group, an oxime-based initiator, and a polymerizable compound, which enhances dispersion stability and allows for high pigment concentration without reducing sensitivity, enabling the formation of thin-layer colored regions with excellent color properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the concentration of pigment in the curable composition is increased to improve color purity, then the content of photopolymerizable components decreases, resulting in reduced sensitivity and poor developability
Solution Approach 1:
The patent introduces a polymerization inhibitor as an intermediary substance that mediates between the pigment and the photopolymerizable components. This inhibitor prevents premature polymerization of the monomer, allowing the composition to maintain high pigment concentration while still achieving proper curing when exposed to light. The inhibitor acts as a controlled barrier that can be removed by the intended curing process, thus resolving the contradiction between high pigment content and sufficient polymerizable component content.
2Quantity of substance
If the content of photopolymerization initiator and photopolymerizable monomer is decreased to increase pigment concentration, then sensitivity is reduced, but film thinning becomes difficult
Solution Approach 1:
The patent changes the chemical parameters of the composition by selecting specific types of photopolymerizable monomers and photopolymerization initiators that are highly efficient. Additionally, the introduction of a polymerization inhibitor creates a new parameter (inhibitor concentration) that controls the polymerization kinetics. This allows the system to achieve proper film formation even with reduced amounts of traditional curing components, thus enabling both high pigment concentration and adequate film thinning capability.
3Ease of operation
If a polymer of high acid value is added to secure developability, then sensitivity is maintained, but the proportion of curable components must be reduced further
Solution Approach 1:
The polymerization inhibitor serves as an intermediary that enables the use of high acid value polymers without further reducing curable component proportions. By controlling the polymerization process and preventing premature curing, the inhibitor allows sufficient space in the composition for both the polymer (which provides developability) and the photopolymerizable components (which provide sensitivity and curing capability).
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 solution allows for high-sensitivity curing and excellent developability, even with high pigment concentrations, resulting in finely formed colored regions with improved color properties and stability, addressing the limitations of previous compositions.
Implementation Method 1
a colored curable composition comprising: (A) a pigment dispersion containing (a-1) a pigment, (a-2) a compound having a pigment skeletal structure and an amino group in its molecule, and (a-3) a dispersion resin; (B) an oxime-based initiator; and (C) a polymerizable compound
Data Source
AI summary
A colored curable composition including: (A) a pigment dispersion containing (a-1) a pigment, (a-2) a compound having a pigment skeletal structure and an amino group in its molecule, and (a-3) a dispersion resin; (B) an oxime-based initiator; and (C) a polymerizable compound. A colored curable composition that is useful for forming a colored region of a color filter, which even with a high content of a pigment, is capable of curing with high sensitivity, is excellent in developability and is capable of highly finely forming a thin-layer colored region excellent in hue is also provided. A color filter provided with a high fine thin-layer colored region excellent in color properties formed by the colored curable composition of the invention, and a solid image pickup device provided with the color filter, which is excellent in color properties are further provided.