Curable Inkjet Resist Ink Composition for Stable PCB Color and Ejection
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Solution Overview
Problem
Existing inkjet resist inks face challenges with pigment dispersion stability and ejection stability during long-term storage, and color fluctuation due to high-temperature treatments, which affect the adhesion and heat resistance of the cured film.
Innovation Solution
An active ray-curable inkjet resist ink formulation containing specific pigments, dispersing agents, and polymerizable compounds, with controlled halogen content and absence of black inorganic pigments, enhances dispersion and ejection stability while suppressing color fluctuation and improving adhesion and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If surface-treated pigment is used to enhance dispersion stability, then pigment dispersion stability is improved, but ejection stability deteriorates due to halogen content increase
Solution Approach 1:
The invention changes the chemical parameters of the dispersing agent by specifying amine value (10-50 mg KOH/g) and acid value (0.5-5 mg KOH/g) ratios, and controls halogen content to 500 ppm or less. This parameter optimization allows achieving both good dispersion stability and ejection stability without using conventional surface-treated pigments that contain halogen.
Solution Approach 2:
The invention replaces expensive and problematic surface-treated pigments with cost-effective, halogen-free alternative pigments combined with specifically formulated dispersing agents. This substitution eliminates the need for complex surface treatment processes while achieving comparable or superior performance.
2Stability of the object's composition
If black inorganic pigment is used to suppress color fluctuation, then color stability is improved, but adhesion and heat resistance deteriorate
Solution Approach 1:
The invention extracts and removes black inorganic pigments from the ink formulation entirely. Instead, it uses organic pigments with specific halogen content control and complementary dispersing agents to achieve color stability without the adverse effects of inorganic black pigments on adhesion and heat resistance.
Solution Approach 2:
The invention creates a composite system combining organic pigments with controlled halogen content, specifically formulated dispersing agents (with amine value > acid value), and polymerizable compounds. This composite approach achieves color stability through synergistic effects while maintaining good adhesion and heat resistance properties.
3Manufacturing precision
If inkjet ink is applied to form solder resist pattern, then manufacturing precision is improved, but pigment dispersion stability deteriorates during long-term storage
Solution Approach 1:
The invention performs preliminary stabilization by formulating the ink with dispersing agents that prevent pigment aggregation before storage. The dispersing agents are specifically selected with amine values and acid values within defined ranges, and halogen content is controlled to 500 ppm or less, ensuring stability is established in advance before the ink is stored or used.
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 inkjet resist ink achieves stable pigment dispersion and ejection over time, reduces color fluctuation after high-temperature treatments, and enhances adhesion and heat resistance of the cured film.
Implementation Method 1
an active ray-polymerizable compound (A)
Implementation Method 2
a pigment dispersing agent (C), wherein the pigment dispersing agent (C) has an amine value and an acid value
Data Source
AI summary
The ink according to the present invention is an actinic radiation-curable inkjet resist ink comprising an actinic radiation-polymerizable compound (A), a pigment (B), and a pigment dispersant (C), wherein: the pigment (B) contains a red pigment (B1) having a maximum absorption wavelength from 480 nm to 600 nm and a pigment (B2) having a color different from that of the red pigment (B1); the pigment dispersant (C) has an amine value larger than its acid value; the halogen content in the inkjet resist ink is not more than 900 ppm; and the actinic radiation-curable inkjet resist ink substantially does not contain a black inorganic pigment.