UV-Curable Ink Composition Suppressing Bleeding via Fluorescent Brightener
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Solution Overview
Problem
UV-curable ink jet ink compositions face challenges with bleeding out after curing due to the addition of fluorescent brighteners, requiring improved curing properties and adhesion while maintaining low viscosity and stretch resistance.
Innovation Solution
A UV-curable ink jet ink composition comprising a compound of formula (A), monofunctional monomers with alicyclic hydrocarbon or cyclic ether groups, fluorescent brighteners, and acylphosphine oxide polymerization initiators, along with optional urethane acrylate oligomers and sensitizers, to achieve enhanced curing properties and reduced bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorescent brightener is added to improve curing properties, then curing properties are improved, but bleeding out as solid matter is observed after curing
Solution Approach 1:
The patent applies parameter changes by carefully controlling the concentration of fluorescent brightener within 0.05-0.50 mass%, and by adjusting the ratio of monofunctional monomer (10-50 mass%) and compound of formula (A) (10-60 mass%) to optimize curing properties while suppressing bleeding out. This quantitative parameter optimization resolves the contradiction between improving curing and preventing harmful bleeding.
Solution Approach 2:
The patent uses a composite ink composition system combining multiple components: compound of formula (A), monofunctional monomer with alicyclic hydrocarbon or cyclic ether group, fluorescent brightener, and acylphosphine oxide polymerization initiator. This composite formulation synergistically improves curing properties while controlling bleeding through the combined effects of different materials.
2Productivity
If the ink composition is cured at high irradiation intensity for short time, then productivity is improved, but curing quality may be compromised
Solution Approach 1:
The patent selects acylphosphine oxide polymerization initiators with specific absorption characteristics that enable effective curing at UV irradiation intensities of 300-1000 mW/cm². The initiator structure and concentration (3-8 mass%) are optimized to achieve rapid curing while maintaining high quality, allowing short irradiation times without compromising curing completeness.
3Ease of operation
If monomer content is increased to reduce viscosity, then ease of operation is improved, but adhesion and stretch resistance may deteriorate
Solution Approach 1:
The patent optimizes the monomer composition ratio and total content to control viscosity within the range suitable for ink jet recording. By selecting specific monomers (compound of formula (A) and monofunctional monomer with alicyclic hydrocarbon or cyclic ether group) and controlling their proportions, the ink achieves appropriate flow properties while maintaining strong adhesion and stretch resistance after curing.
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 exhibits excellent curing properties, suppressed bleeding, low viscosity, and improved adhesion and stretch resistance, suitable for ink jet printing and UV-LED curing.
Implementation Method 1
a predetermined amount of an acylphosphine oxide polymerization initiator
Implementation Method 2
one or more fluorescent brighteners including a compound represented by the following formula (b1), (b2), (b3), or (b4)
Data Source
AI summary
A UV-curable ink jet ink composition includes: 10.00% by mass or more and 60.00% by mass or less, relative to a total mass of the ink composition, of a compound represented by formula (A); 10.00% by mass or more and 50.00% by mass or less, relative to the total mass of the ink composition, of one or more monofunctional monomers having an alicyclic hydrocarbon group or a cyclic ether group; 0.05% by mass or more and 0.50% by mass or less, relative to the total mass of the ink composition, of one or more fluorescent brighteners including a compound represented by formula (b1), (b2), (b3), or (b4); and 3.00% by mass or more and 8.00% by mass or less, relative to the total mass of the ink composition, of one or more acylphosphine oxide polymerization initiators.