Radiation-Curable Ink Composition for Adhesion on Non-Absorbent Media
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Solution Overview
Problem
Ink jet recording on non-absorbent or low-absorbent recording media results in insufficient adhesion and abrasion resistance of the coating film due to the lack of ink absorption and poor durability of the printed surface.
Innovation Solution
A radiation-curable ink jet composition comprising a monofunctional polymerizable compound as 80% or more of the polymerizable compound, combined with a white pigment and inorganic particles, which is used in conjunction with a non-white ink to form a cured film on the recording medium, followed by a second layer of white ink application and curing to enhance adhesion and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ink jet recording is performed on non-absorbent or low-absorbent recording media, then the recording process can be completed, but the adhesion of the coating film to the recording medium is insufficient and abrasion resistance is poor
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by incorporating polymerizable compounds (acrylates, vinyl monomers) that can undergo polymerization reactions. This transforms the ink from a simple dye solution to a reactive composition that forms strong chemical bonds with the recording medium, significantly improving adhesion and abrasion resistance on non-absorbent surfaces.
Solution Approach 2:
The patent creates a composite material system combining organic polymerizable compounds with inorganic pigments and additives. The resulting cured film is a composite structure that integrates the adhesive properties of polymers with the protective properties of inorganic particles, achieving both strong adhesion and high abrasion resistance simultaneously.
2Reliability
If conventional ink jet recording is performed on non-absorbent or low-absorbent recording media, then the recording process can be completed, but the durability of the printed surface is poor
Solution Approach 1:
The patent changes the physical state and mechanical properties of the ink film through polymerization. The ink transitions from a liquid state with poor mechanical strength to a cross-linked polymer network with high durability and abrasion resistance, enabling the printed surface to withstand mechanical stress and wear.
Solution Approach 2:
The patent develops a composite ink formulation containing polymerizable organic compounds and inorganic particles. After curing, this forms a composite coating that combines the flexibility and adhesion of organic polymers with the hardness and wear resistance of inorganic particles, significantly enhancing overall durability.
3Reliability
If polyfunctional polymerizable compounds are used to improve adhesion, then cross-linking density increases, but the flexibility of the cured film decreases
Solution Approach 1:
The patent applies local quality by using different types of polymerizable compounds with different functionality in specific proportions. Monofunctional compounds (80-99.9% by mass) provide flexibility and adhesion, while small amounts of polyfunctional compounds (0.1-20% by mass) provide cross-linking for durability. This localized functional distribution optimizes both flexibility and adhesion.
Solution Approach 2:
The patent precisely controls the compositional parameters of the polymerizable compounds, specifically maintaining monofunctional compounds at 80-99.9% by mass. This parameter control ensures the cured film achieves the optimal balance between flexibility (from monofunctional units) and adhesion strength (from cross-linking provided by polyfunctional units).
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 method achieves a recorded material with excellent adhesion and abrasion resistance by utilizing the high flexibility of the monofunctional polymerizable compound and protective properties of the inorganic particles in the cured film, preventing scratches and peeling when the layers are stacked.
Implementation Method 1
a radiation-curable ink jet composition containing a polymerizable compound, a white pigment, and inorganic particles different from the white pigment
Data Source
AI summary
A radiation-curable ink jet composition contains a polymerizable compound, a white pigment, and inorganic particles different from the white pigment. The polymerizable compound includes a monofunctional polymerizable compound. The content of the monofunctional polymerizable compound is 80 mass % or more with respect to the total mass of the polymerizable compound contained in the radiation-curable ink jet composition.