Inkjet Curable Composition for Oxygen-Resistant Deep Curing
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Solution Overview
Problem
Conventional curable compositions for inkjet printing are susceptible to oxygen inhibition, leading to reduced curing performance at the surface and deep points, and are prone to bleeding due to their high specific surface area when discharged as droplets.
Innovation Solution
A curable composition for inkjet printing containing an oxime ester-based photopolymerization initiator, amino group-containing (meth)acrylate, and a block isocyanate compound, which improves curing performance at both surface and deep points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If curable compositions are discharged as small droplets to enable inkjet printing, then the composition can be applied through inkjet printers, but the specific surface area becomes large causing increased oxygen dissolution and diffusion
Solution Approach 1:
The patent changes the chemical composition parameters of the curable composition by incorporating specific photopolymerization initiators (Irgacure 2959, Irgacure 819), amino group-containing (meth)acrylate compounds, and block isocyanate compounds in controlled ratios. This compositional parameter adjustment enables the formulation to maintain low viscosity for inkjet dispensing while achieving resistance to oxygen inhibition during UV curing, thus resolving the contradiction between ease of inkjet application and resistance to oxygen dissolution.
2Reliability
If oxygen dissolves and diffuses in the curable composition, then the composition can be delivered to the substrate, but oxygen inhibition hinders curing and reduces curing performance at surface point
Solution Approach 1:
The patent employs a composite photopolymerization system combining multiple initiators (Irgacure 2959, Irgacure 819) with amino group-containing (meth)acrylate compounds and block isocyanate compounds. This composite material approach creates synergistic effects where the combination of components works together to overcome oxygen inhibition more effectively than individual components alone, thereby improving curing performance at the surface point despite oxygen presence.
Solution Approach 2:
The patent optimizes the concentration ratios of photopolymerization initiators, amino group-containing (meth)acrylate compounds, and block isocyanate compounds to specific ranges. By adjusting these compositional parameters, the system achieves optimal balance between oxygen resistance and curing effectiveness at the surface, transforming the chemical parameters to counteract oxygen inhibition.
3Reliability
If conventional curable compositions are used, then the composition has low viscosity suitable for inkjet, but curing performance at deep point is insufficient
Solution Approach 1:
The patent uses a composite formulation incorporating photopolymerization initiators, amino group-containing (meth)acrylate compounds, hydroxyl group-containing (meth)acrylate, and block isocyanate compounds. This multi-component composite system provides both the low viscosity needed for inkjet dispensing and the enhanced penetrating power required for effective deep-point curing, overcoming the limitation of conventional single-system compositions.
Solution Approach 2:
The patent carefully controls the viscosity parameters of the curable composition while adjusting the concentrations of reactive components. By optimizing viscosity within specific ranges and balancing the composition of photopolymerization initiators and monomers, the formulation maintains inkjet dispensability while ensuring sufficient penetration and curing performance at deep points.
4Reliability
If the composition is cured with ultraviolet light, then the composition can be rapidly cured, but bleeding occurs due to poor surface curing
Solution Approach 1:
The patent employs a composite photopolymerization system with multiple initiators and amino group-containing compounds that work synergistically to achieve uniform curing from surface to depth. This composite material approach eliminates the bleeding defect by ensuring proper surface curing while maintaining adhesion, as the combined components provide both surface reactivity and bulk penetration capability.
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 excellent curing performance at both surface and deep points, with enhanced solder heat resistance and reduced bleeding, using a combination of oxime ester-based photopolymerization initiators and amino group-containing (meth)acrylates.
Implementation Method 1
the compositions are cured with ultraviolet light after inkjet printing
Data Source
AI summary
Provided is a curable composition for inkjet printing that has an excellent curing performance at surface point and an excellent curing performance at deep point. The curable composition for inkjet contains (A) an oxime ester-based photopolymerization initiator and (B) an amino group-containing (meth)acrylate compound.