Photocurable Inkjet Ink Composition Balancing Adhesion and Stability
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Solution Overview
Problem
Photocurable inkjet printing ink compositions containing pigments and pigment dispersants face issues with decreased storage stability and dispersion stability due to the inclusion of polymerizable compounds with phosphate groups, which affect adhesion to the target base material.
Innovation Solution
A photocurable inkjet printing ink composition comprising a pigment, pigment dispersant, photopolymerization initiator, and photopolymerizable compound, with specific ratios and types of hydrophilic monofunctional monomers, phosphate (meth)acrylates, and amine-modified oligomers to enhance dispersion stability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polymerizable compound including a phosphate group or a polymerizable phosphate compound is blended with the ink composition to increase adhesion, then the adhesion between the printed layer and the target base material is improved, but the dispersion stability of the pigment and storage stability of the ink composition decrease
Solution Approach 1:
The patent specifies precise parameter ranges for the phosphate (meth)acrylate content (0.2 to 4.0 mass%) and the mass ratio of hydrophilic monofunctional monomer to phosphate (meth)acrylate (15 to 300) to optimize the balance between adhesion and dispersion stability. By controlling these parameters within specific ranges, the invention resolves the contradiction between improving adhesion while maintaining pigment dispersion stability
Solution Approach 2:
The invention uses a composite photopolymerizable compound system comprising both hydrophilic monofunctional monomer and phosphate (meth)acrylate. This composite approach allows the phosphate component to provide adhesion enhancement while the hydrophilic monofunctional monomer maintains pigment dispersion stability, thus resolving the contradiction between these two opposing requirements
2Strength
If a polymerizable compound including a phosphate group or a polymerizable phosphate compound is blended with the ink composition to increase adhesion, then the adhesion between the printed layer and the target base material is improved, but the storage stability of the ink composition decreases
Solution Approach 1:
The patent defines specific parameter ranges for phosphate (meth)acrylate content (0.2 to 4.0 mass%) and the mass ratio of hydrophilic monofunctional monomer to phosphate (meth)acrylate (15 to 300) to achieve optimal storage stability while maintaining adhesion performance. These parameter controls prevent excessive phosphate compound content that would degrade storage stability
Solution Approach 2:
The hydrophilic monofunctional monomer acts as an intermediary component that mediates between the phosphate (meth)acrylate and the pigment dispersant system. This intermediary role helps maintain storage stability and pigment dispersion while allowing the phosphate compound to provide adhesion enhancement
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 achieves high adhesion to the target base material while maintaining storage stability, making it easier to handle in printing processes.
Implementation Method 1
irradiating each of the ink droplets with light to cure it
Data Source
AI summary
It is an object to improve the storage stability of a photocurable inkjet printing ink composition containing a pigment and a pigment dispersant by increasing the dispersion stability of the pigment in the ink composition while increasing the adhesion between its printed layer and a target base material for printing. As a solution, provided is a photocurable inkjet printing ink composition containing a pigment, a pigment dispersant, a photopolymerization initiator, and a photopolymerizable compound, wherein the photopolymerizable compound contains a hydrophilic monofunctional monomer and a phosphate (meth)acrylate; the phosphate (meth)acrylate is included in an amount of 0.2 to 4.0 mass% based on the entire ink composition; a mass ratio of the hydrophilic monofunctional monomer to the phosphate (meth)acrylate is 15 to 300; and the pigment dispersant is included in an amount of 38 to 90 parts by mass based on 100 parts by mass of the pigment.