Pigment Dispersion Liquid Stability via In-Situ Polymer Reaction
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Solution Overview
Problem
Existing methods for forming color layers in color filters face challenges with pigment dispersion stability, especially at high concentrations, leading to issues like scumming, poor adhesion, and decreased transparency, which affect image quality and production processes.
Innovation Solution
The in-situ dispersion method involves reacting a polymer with tertiary or lower amines and an amine-reactive low molecular compound to disperse pigments, achieving excellent dispersion stability even with fine pigments and high concentrations, while reducing viscosity and preventing pigment aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pigment concentration in the resin composition is increased to form color layers with higher transparency and concentration, then the color reproducibility is improved, but the pigment dispersion stability deteriorates
Solution Approach 1:
A pigment dispersing agent comprising a polymer with tertiary or lower amines is introduced as an intermediary substance between the pigment particles and the resin composition. This dispersing agent adsorbs onto the pigment surface through amine-pigment interactions, providing steric and electrostatic stabilization that prevents aggregation even at high pigment concentrations, thereby maintaining both color reproducibility and dispersion stability
Solution Approach 2:
The invention changes the chemical parameter of the dispersing system by using polymers with specific amine functional groups that can interact with pigment surfaces. By controlling the amine content and molecular weight of the polymer, the dispersion stability is optimized to support high pigment concentrations while maintaining homogeneous distribution throughout the resin composition
2Illumination intensity
If the pigment concentration is increased to improve color layer transparency, then the color saturation is improved, but the layer forming ability deteriorates due to insufficient solubility
Solution Approach 1:
The pigment dispersing agent acts as a mediator that bridges the pigment particles and the resin matrix. The polymer chains extend into the resin phase, providing compatibility and ensuring proper wetting and adhesion, while the amine groups bound to pigment surfaces prevent aggregation. This dual function maintains layer forming ability even at high pigment concentrations
Solution Approach 2:
The invention creates a composite dispersing system where the pigment dispersing agent combines multiple functional components: amine groups for pigment binding, polymer chains for steric stabilization, and resin-compatible segments for matrix integration. This composite structure simultaneously addresses pigment dispersion and layer forming requirements
3Illumination intensity
If the pigment concentration is increased to improve color reproducibility, then the color intensity is improved, but the adhesion between substrate and patterned cured layer deteriorates
Solution Approach 1:
The pigment dispersing agent serves as an adhesion promoter by interacting with both the pigment particles and the resin composition. The polymer chains extend into the cured resin matrix, creating strong interfacial bonding, while the amine groups remain associated with pigment surfaces. This ensures that high pigment concentrations do not compromise the adhesion between the substrate and the patterned cured layer
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
This approach results in a pigment dispersion liquid with improved stability, adhesion, and high pigment concentration, enabling the production of color filters with high color reproducibility, definition, and contrast.
Implementation Method 1
dispersing a pigment by mixing a polymer (B) having tertiary or lower amines, an amine-reactive low molecular compound (C), and a dispersion medium (D), and dispersing the pigment (A) while reacting the polymer (B) with the low molecular compound (C)
Data Source
AI summary
The present invention is to provide a pigment dispersion liquid which has excellent pigment dispersion stability and high productivity even in the case of using a fine pigment and having high pigment concentration; a method for producing the pigment dispersion liquid; a color resin composition which has excellent pigment dispersion stability, causes no clogging problem, has excellent adhesion, and is able to form color layers with high pigment concentration, with accuracy; and a color filter comprising the resin composition. Disclosed is a method for producing a pigment dispersion liquid, comprising the step of dispersing a pigment by mixing at least a pigment (A), a polymer (B) having tertiary or lower amines, an amine-reactive low molecular compound (C), and a dispersion medium (D), and dispersing the pigment (A) while reacting the polymer (B) with the low molecular compound (C), and a pigment dispersion liquid produced by the production method.