Acrylic Ink Composition for Color Filters with Melamine Cross-linking
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Solution Overview
Problem
The manufacturing of color filters using inkjet methods faces challenges in achieving high chemical resistance and adhesive properties, particularly when exposed to solvents like NMP, which can cause pigment elution and peeling, leading to potential failures in LCD panel production.
Innovation Solution
An ink composition is developed that includes an acrylic binder resin polymerized with specific monomers, a melamine compound, and a solvent with high boiling point, along with pigments, to enhance chemical resistance and adhesive properties, ensuring high contrast ratios and stability during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the content of pigment in the ink composition is increased to achieve high color reproducibility and brightness, then the color performance is improved, but the content of other components such as binder resin and cross-linking agent is relatively reduced, causing the ink-coated film to lack sufficient strength and chemical resistance
Solution Approach 1:
The patent changes the chemical parameters of the binder resin by specifying a particular acrylic resin with controlled molecular weight (10,000-50,000) and functional groups. It also introduces a melamine compound as a cross-linking agent with specific molecular structure, and adjusts the solvent composition to include high-boiling-point solvents. These parameter changes enable the formulation to achieve both high pigment concentration (15-30 wt%) and sufficient film strength/chemical resistance simultaneously.
Solution Approach 2:
The patent creates a composite ink formulation combining multiple components: acrylic binder resin, melamine compound, high-boiling-point solvents, and pigments. The melamine compound acts as a cross-linking agent that forms a three-dimensional network structure with the acrylic resin, creating a composite material system that provides both adhesion and chemical resistance even at high pigment concentrations.
2Reliability
If the content of binder resin and cross-linking agent is increased to improve chemical resistance and adhesive properties, then the film strength is improved, but the content of pigment is relatively reduced, affecting color reproducibility and brightness
Solution Approach 1:
The patent optimizes the molecular weight parameter of the acrylic binder resin to the range of 10,000-50,000, which provides sufficient adhesion and chemical resistance. It also specifies the melamine compound content at 1-20 wt% and controls the solvent composition with high-boiling-point solvents comprising 70-90 wt% of the total solvent. These parameter optimizations enable the formulation to achieve both high film strength and high pigment concentration (15-30 wt%) without compromise.
3Ease of manufacture
If a simple ink formulation is used to reduce manufacturing complexity, then the manufacturing process is simplified, but the ink-coated film lacks sufficient strength and chemical resistance when exposed to solvents like NMP
Solution Approach 1:
The patent employs a composite material system consisting of acrylic binder resin combined with melamine compound as cross-linking agent. This composite formulation, though containing multiple components, maintains manufacturing simplicity through direct mixing without complex processing steps. The melamine-acrylic composite provides enhanced chemical resistance and adhesive properties while keeping the manufacturing process straightforward and suitable for inkjet application.
Solution Approach 2:
The patent introduces high-boiling-point solvents as intermediaries in the ink formulation. These solvents mediate between the pigment particles and binder resin, ensuring uniform dispersion and proper film formation. The high-boiling-point solvents also contribute to the chemical resistance of the final film by creating a matrix that resists penetration by lower-boiling-point solvents like NMP, thereby enhancing chemical resistance without complicating the manufacturing process.
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 ink composition demonstrates improved chemical resistance and adhesive properties, preventing pigment elution and peeling, thereby ensuring the production of color filters with high contrast ratios and stability, even after heat treatment, thus addressing the limitations of existing methods.
Implementation Method 1
an acrylic binder resin obtained by polymerizing the group of monomers including the compound represented by Formula 1
Implementation Method 2
a solvent having a high boiling point
Data Source
AI summary
Provided is an ink composition for manufacturing color filters. The ink composition includes an acrylic binder resin obtained by polymerizing the group of monomers containing a compound represented by Formula 1. The ink composition has good chemical resistance and adhesive properties and is used for manufacturing color filters exhibiting a high contrast ratio:(where Ra is —H, or —CH3, and Rb is an alkyl group having 6-30 carbon atoms).