Cationic Photocurable Ink Composition to Reduce Nozzle Clogging
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Solution Overview
Problem
Existing cationic photocurable ink compositions cause nozzle clogging, particularly in high-precision nozzles, and suffer from limited monomer selection and image precision.
Innovation Solution
A cationic photocurable composition comprising specific cationic polymerizable compounds (Compound A-1 and Compound A-2) with controlled molecular weight and oxygen content, along with a cationic initiator, pigment, and optional sensitizer, achieving a viscosity range of 2 to 50 mPa·s, which reduces nozzle clogging and enhances curing speed and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cationic photocurable ink compositions are used, then oxygen inhibition is avoided and color longevity is improved, but nozzles are easily clogged and image precision is limited
Solution Approach 1:
The patent changes the molecular weight parameter of the cationic polymerizable compound to less than 300, and controls the oxygen content at 12-30% of molecular weight. It also adjusts the viscosity parameter to 2-50 mPa·s, which prevents nozzle clogging while maintaining color longevity benefits of cationic polymerization
Solution Approach 2:
The patent creates a composite ink composition combining specific cationic polymerizable compounds (with defined molecular weight and oxygen content), cationic initiators, pigments, and optional sensitizers. This composite formulation achieves both non-clogging properties and effective photocuring with excellent adhesion
2Adaptability or versatility
If free radical polymerization inkjet inks are used, then material selection is wide, but oxygen inhibition greatly affects curing and image precision is limited
Solution Approach 1:
The patent extracts and eliminates the oxygen inhibition problem by using cationic polymerization chemistry instead of free radical polymerization. The cationic mechanism proceeds without oxygen interference, enabling precise image formation while maintaining broad material selection through various cationic polymerizable compounds
Solution Approach 2:
The patent changes the polymerization mechanism parameter from free radical to cationic, and adjusts molecular weight to less than 300 with controlled oxygen content, achieving both wide material compatibility and high image precision
3Object-generated harmful factors
If existing cationic photocurable compositions are used, then nozzle clogging is partially solved, but high-precision nozzle performance is still not achieved
Solution Approach 1:
The patent further refines the molecular weight parameter to less than 300 and controls viscosity to 2-50 mPa·s, which optimizes flow characteristics for high-precision nozzles. The controlled oxygen content (12-30% of molecular weight) ensures proper curing without compromising nozzle performance
Solution Approach 2:
The patent replaces mechanical mixing or processing with photocurable chemistry that achieves precise patterning through light-initiated polymerization. The low viscosity formulation enables passive flow through high-precision nozzles without mechanical assistance
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 effectively prevents nozzle clogging, especially in high-precision nozzles, with clear and uniform patterns, high curing speed, and excellent adhesion, suitable for inkjet printing applications.
Implementation Method 1
active energy ray-curable inks can form the desired pattern quickly in a non-contact manner
Data Source
AI summary
Provided in the present invention are a cationic photocurable composition for ink, and the use thereof. The composition comprises: a cationic polymerizable compound, a cationic initiator and a pigment, wherein the cationic polymerizable compound comprises a compound A-1 and a compound A-2; the structural formula of the compound A-1 is formula 1: where R1 represents methyl or ethyl; the compound A-2 is a vinyl-free polymerizable monomer having a molecular weight of less than 300, and the molecular weight of oxygen in the molecule accounts for 12-30% of the molecular weight of the compound; and the sum of the content of the compound A-1 and the compound A-2 accounts for 40 wt% to 90 wt% of the total content of the composition, and the weight ratio of the compound A-1 to the compound A-2 is 8 : 1 to 1 : 5. When used as the main component of an ink, the composition can effectively mitigate the problem of a cationic polymerizable ink easily blocking a nozzle, and especially has a significant effect on a high-precision nozzle; and the pattern formed therefrom after curing is clear and uniform, and has good appearance performance.