Active Energy Ray Curing Composition Balancing Adhesion and Fastness
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Solution Overview
Problem
Existing active energy ray curing compositions face a trade-off between substrate attachability and fastness, with overcoat liquids penetrating printed matter due to low fastness and films becoming brittle when fastness is enhanced.
Innovation Solution
An active energy ray curing composition containing a second active energy ray curing composition with a polyfunctional monomer proportion of 60% by mass or more, 90% modified with oxyalkylene groups, and 50% tri- or higher polyfunctional monomers, along with a first composition that includes a polyester resin and polymerizable tree-like branched compounds, to enhance film strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the proportion of polyfunctional monomer is increased to enhance film strength and fastness, then the film becomes more resistant to penetration and has better substrate attachability, but the film becomes brittle
Solution Approach 1:
The patent applies parameter changes by precisely controlling the proportion of polyfunctional monomer (60-90% by mass) and the ratio of tri- or higher polyfunctional monomers (50% or more of the polyfunctional monomer). This quantitative parameter optimization resolves the contradiction by finding the optimal balance point where sufficient crosslinking density provides film strength without excessive brittleness
Solution Approach 2:
The patent uses composite materials by combining polyfunctional monomers with specific structural characteristics (oxyalkylene groups matching the number of functional groups) with photopolymerization initiators. This composite approach creates a balanced formulation where the polyfunctional monomer provides crosslinking strength while the specific molecular structure prevents excessive brittleness
2Strength
If overcoat liquid is applied to enhance substrate attachability, then the liquid can penetrate printed matter, but this penetration reduces fastness
Solution Approach 1:
The patent changes the parameter of monomer functional group structure by using polyfunctional monomers where the number of oxyalkylene groups matches the number of functional groups. This structural parameter change enables the overcoat liquid to achieve both penetration capability for substrate attachability and sufficient molecular weight/crosslinking for fastness, resolving the contradiction between penetration and fastness
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 a balance between substrate attachability and fastness, with improved film strength and stability, preventing penetration and brittleness, while maintaining high discharging stability.
Implementation Method 1
an active energy ray curing composition containing a radical reactive compound or radical monomer and a photoradical initiator
Data Source
AI summary
An active energy ray curing composition can be applied to cured matter of a first active energy ray curing composition. The active energy ray curing composition contains a second active energy ray curing composition containing a monofunctional monomer, a polyfunctional monomer, and a photopolymerization initiator. The proportion of the polyfunctional monomer to the second active energy ray composition is 60 percent by mass or more. The proportion of the polyfunctional monomer modified with the same number of an oxyalkylene group as the number of functional groups of the polyfunctional monomer is 90 percent by mass of the polyfunctional monomer, and the proportion of a tri- or higher polyfunctional monomer is 50 percent by mass or more to the modified polyfunctional monomer.