Radiation-Curable Ink Jet Composition Adhesiveness
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Solution Overview
Problem
Existing ink jet recording methods face challenges in achieving high adhesiveness and color reproducibility, particularly when using high proportions of monofunctional monomers, as they can result in insufficient adhesiveness depending on the type and amount of coloring material and recording medium.
Innovation Solution
A radiation-curable ink jet composition is developed, comprising inorganic particles, a coloring material, and a polymerizable compound with a monofunctional monomer content of 80% or greater, and inorganic particles at 10% or less, which improves adhesiveness and color reproducibility by adjusting the inorganic particle content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the content of monofunctional monomer is increased to improve adhesiveness, then adhesiveness is improved, but color reproducibility deteriorates depending on the kind or amount of coloring material
Solution Approach 1:
The patent changes the chemical composition parameters of the polymerizable compound by incorporating specific functional monomers (carboxyl group-containing, hydroxyl group-containing, or amino group-containing monomers) in controlled amounts (5-50 mass% of total polymerizable compound). This parameter adjustment allows the coating film to achieve both high adhesiveness through chemical bonding with the recording medium and good color reproducibility by maintaining appropriate pigment dispersion and coverage.
2Manufacturing precision
If the content of inorganic particles is increased to improve color density, then color density is improved, but adhesiveness deteriorates
Solution Approach 1:
The patent optimizes the inorganic particle content parameter to 10 mass% or less of the total ink composition. This parameter control prevents excessive inorganic particle aggregation that would harm adhesiveness, while still maintaining sufficient color density through proper pigment-inorganic particle interaction and dispersion in the functional monomer matrix.
3Ease of operation
If the proportion of monofunctional monomer is increased to reduce viscosity, then ease of operation is improved, but coating film quality deteriorates
Solution Approach 1:
The patent creates a composite polymerizable compound system combining monofunctional monomers (for low viscosity and good ejectability) with polyfunctional monomers containing specific functional groups (carboxyl, hydroxyl, or amino groups). This composite material approach allows the ink to maintain low viscosity for easy jetting while the functional groups provide chemical bonding capability for high-quality coating films with good adhesiveness and color fastness after curing.
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 enhanced adhesiveness and color reproducibility, reducing the likelihood of coating film peeling and maintaining image quality, even under stretching or bending conditions.
Implementation Method 1
irradiating with radiation the radiation-curable ink jet composition adhering to the recording medium
Data Source
AI summary
A radiation-curable ink jet composition includes inorganic particles, a coloring material, and a polymerizable compound. The polymerizable compound contains a monofunctional monomer. A content of the monofunctional monomer is 80% by mass or greater with respect to a total amount of the polymerizable compound. A content of the inorganic particles is 10% by mass or less with respect to a total amount of the ink composition.