Coloring Composition for Color Filters with Dual Initiators
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing coloring compositions for producing cured films, such as color filters, face challenges in achieving both excellent storage stability and moisture resistance, as previously described compositions tend to compromise on one or the other.
Innovation Solution
A coloring composition incorporating a colorant, a radically polymerizable compound, and a photo-radical polymerization initiator, with the addition of a thermal-radical polymerization initiator, specifically pinacol or α-hydroxyacetophenone compounds, which have a molar absorption coefficient of 100 L×mol−1×cm−1 or less at 365 nm and a thermal decomposition temperature between 120° C to 270° C, is used to form a cured film with enhanced stability and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photopolymerization initiator or thermal polymerization initiator is contained in the coloring composition, then the film can be cured, but storage stability deteriorates
Solution Approach 1:
The invention divides the polymerization initiation function into two separate components: a photopolymerization initiator for UV curing and a thermal polymerization initiator for post-curing. This segmentation allows each initiator to be optimized for its specific function while maintaining overall composition stability during storage, as neither initiator alone causes premature polymerization.
Solution Approach 2:
The invention carefully controls the concentration parameters of both photopolymerization and thermal polymerization initiators within specific ranges. By optimizing these parameters, the composition achieves sufficient curing capability while minimizing premature reaction during storage, thus balancing reliability and stability.
2Ease of manufacture
If conventional coloring compositions are used, then the production process is simple, but moisture resistance deteriorates
Solution Approach 1:
The invention creates a composite coloring composition that integrates multiple functional components: colorant, photopolymerization initiator, thermal polymerization initiator, and radically polymerizable compound. This composite formulation achieves both excellent moisture resistance and complete polymerization curing while maintaining relatively simple production processes.
Solution Approach 2:
The thermal polymerization initiator is pre-incorporated into the coloring composition during manufacturing, enabling post-curing to occur after UV irradiation. This preliminary preparation ensures that the composition is ready for complete curing without requiring additional chemical additions, thus maintaining production simplicity while achieving superior moisture resistance.
3Duration of action of moving object
If the coloring composition is stored for extended periods, then production flexibility increases, but viscosity increase occurs
Solution Approach 1:
The thermal polymerization initiator acts as an intermediary that remains dormant during storage and UV curing, then activates later to complete the polymerization. This intermediary role prevents premature polymerization during extended storage, maintaining viscosity stability while allowing production flexibility.
Solution Approach 2:
The composition is formulated with controlled amounts of thermal polymerization initiator that provides a cushion against viscosity increase during storage. This prior cushioning effect ensures that even during extended storage periods, the composition maintains stable viscosity until the post-curing stage.
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 effectively suppresses viscosity increase during storage, reduces residual unreacted monomers, and provides excellent photolithographic properties, resulting in a cured film with improved storage stability and moisture resistance.
Implementation Method 1
a photo-radical polymerization initiator
Implementation Method 2
a thermal decomposition temperature of 120° C. to 270° C.
Implementation Method 3
a thermal-radical polymerization initiator
Data Source
AI summary
A coloring composition includes a colorant, a radically polymerizable compound, a photo-radical polymerization initiator, and a thermal-radical polymerization initiator, in which the thermal-radical polymerization initiator includes at least one selected from a pinacol compound or an α-hydroxyacetophenone compound.