Active Energy Ray-Curable Ink for Lamination Strength and Storage Stability
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Solution Overview
Problem
Existing active energy ray-curable ink jet inks face a trade-off between lamination strength and storage stability, where improving one often deteriorates the other.
Innovation Solution
The ink formulation includes specific ratios of polymer-type pigment dispersing agents with different glass transition temperatures (80°C or higher and 0°C or lower) and a balanced concentration of polymerizable compounds, such as N-vinylcaprolactam and (meth)acryloyl morpholine, to achieve both excellent lamination strength and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the formulation of active energy ray-curable ink jet ink is adjusted to improve lamination strength, then lamination strength is improved, but storage stability is decreased
Solution Approach 1:
The patent applies parameter changes by adjusting the glass transition temperatures and concentration ratios of polymer-type pigment dispersing agents. Specifically, it uses a combination of dispersing agents with Tg≥80°C and Tg≤0°C in controlled concentration ratios (0.05≤M1/M2≤2.00), which modifies the ink's rheological and adhesive parameters to simultaneously achieve high lamination strength and storage stability without compromising either property
Solution Approach 2:
The patent employs composite materials by formulating the ink with multiple polymer-type pigment dispersing agents having different glass transition temperatures (one with Tg≥80°C and another with Tg≤0°C). This composite approach creates a synergistic effect where the high-Tg agent provides lamination strength while the low-Tg agent maintains storage stability, resolving the contradiction between these two properties
2Reliability
If the formulation of active energy ray-curable ink jet ink is adjusted to improve storage stability, then storage stability is improved, but lamination strength is decreased
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the concentration ratio parameter (M1/M2) between high-Tg and low-Tg dispersing agents. By maintaining this ratio within 0.05≤M1/M2≤2.00, the formulation achieves optimal balance where the low-Tg agent (M2) contributes to storage stability while the high-Tg agent (M1) ensures adequate lamination strength, preventing the trade-off described in the contradiction
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 achieves improved lamination strength and storage stability simultaneously, with the dispersing agents and compounds contributing to enhanced adhesion and stability without compromising performance.
Implementation Method 1
a polymer-type pigment dispersing agent having a glass transition temperature of 80° C. or higher; and a polymer-type pigment dispersing agent having a glass transition temperature of 0° C. or lower
Implementation Method 2
active energy ray-curable ink jet ink
Data Source
AI summary
An active energy ray-curable ink jet ink includes: a coloring pigment; a polymerizable compound; a polymer-type pigment dispersing agent having a glass transition temperature of 80° C. or higher; and a polymer-type pigment dispersing agent having a glass transition temperature of 0° C. or lower, in which, in a case where a concentration of the polymer-type pigment dispersing agent having a glass transition temperature of 80° C. or higher is indicated by M1 and a concentration of the polymer-type pigment dispersing agent having a glass transition temperature of 0° C. or lower is indicated by M2, 0.2≤M1/M2 is satisfied.