Silicone Copolymer Leveling Agent for Pigment Sublimation Control
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Solution Overview
Problem
Existing leveling agents containing fluorine atoms pose a high environmental burden and fail to effectively suppress the generation of foreign substances due to pigment sublimation on the surface of coated films in color filters, leading to color unevenness and light scattering.
Innovation Solution
A silicone-containing copolymer is developed, comprising a polymerizable monomer with a specific group and a monomer with a cyclic hydrocarbon skeleton, which forms a rigid structure to physically block pigment sublimation and reduce environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a leveling agent containing a fluorine atom is used, then the smoothness of the coated film is improved, but the environmental burden increases
Solution Approach 1:
The invention replaces fluorine atoms in the leveling agent with silicone-containing copolymer structures. Specifically, it uses a copolymer comprising a polymerizable monomer (A) having a specific group and a polymerizable monomer (B) having a group including a cyclic hydrocarbon skeleton, which provides leveling functionality without the environmental burden of fluorine compounds.
Solution Approach 2:
The invention employs a composite polymer structure combining monomer (A) with specific functional groups and monomer (B) with cyclic hydrocarbon skeleton. This composite material approach achieves both the desired smoothness effect and reduced environmental impact by integrating multiple functional components into a single copolymer system.
2Illumination intensity
If the pigment content in the coated film is increased to achieve desired color phase, then the color brightness is improved, but the sublimation of pigment occurs more easily causing foreign substance generation
Solution Approach 1:
The silicone-containing copolymer acts as an intermediary substance between the pigment particles and the coating matrix. It modifies the local environment around pigment molecules, suppressing their sublimation tendency while maintaining their color-generating function. The copolymer creates a stabilizing interface that prevents pigment migration and crystallization on the film surface.
Solution Approach 2:
The invention changes the chemical and physical parameters of the coating matrix by introducing the silicone-containing copolymer. This modification alters the interaction between pigment molecules and the surrounding medium, reducing the sublimation rate and preventing foreign substance formation even at high pigment concentrations required for desired color brightness.
3Illumination intensity
If the pigment molecules are allowed to crystallize and aggregate on the surface, then the color phase is enhanced, but light scattering occurs causing color unevenness
Solution Approach 1:
The silicone-containing copolymer serves as a mediating agent that controls pigment molecule behavior. It prevents the uncontrolled crystallization and aggregation that leads to light scattering, while still allowing sufficient pigment concentration for desired color phase. The copolymer creates a uniform distribution environment that eliminates color unevenness.
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 silicone-containing copolymer reduces environmental burden and effectively suppresses the generation of foreign substances on the coated film surface, ensuring even film thickness and color uniformity in color filters.
Implementation Method 1
the pigment is easily sublimated in a drying step of the coated film containing the pigment, and easily grows as a crystallized product or an aggregated body
Data Source
AI summary
A silicone-containing copolymer that is capable of reducing an environmental burden and gives an effect of suppressing the occurrence of foreign substances due to the sublimation of a pigment on the surface of a coated film. Specifically, the silicone-containing copolymer contains: a polymerizable monomer (A) having a group represented by General Formula (a) described below; and a polymerizable monomer (B) having a group including a cyclic hydrocarbon skeleton, as at least a polymerization component.