UV-Curable Ink Jet Composition with Treated Metal Particles
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Solution Overview
Problem
Conventional ultraviolet ray curable ink jet compositions using metal particles face issues with storage stability and ejection stability due to viscosity increases, leading to inferior wear resistance and reduced durability of printed objects, while also failing to effectively exhibit the inherent gloss properties of metal particles.
Innovation Solution
The composition includes metal particles subjected to surface treatment with silane coupling agents, phosphoric acid esters, or carboxylic acids, along with a polymerizable compound and a specific substance A, to enhance storage stability and curing properties, resulting in improved gloss and wear resistance of printed objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal particles are used in ultraviolet ray curable ink jet composition, then gloss properties are improved, but storage stability deteriorates due to gel formation and viscosity increase
Solution Approach 1:
The patent introduces a specific compound (substance A with formula (1)) as an intermediary substance that mediates between metal particles and the polymerizable compound. This compound prevents direct harmful interactions that cause gel formation, thereby maintaining storage stability while preserving the gloss-enhancing properties of metal particles.
Solution Approach 2:
The patent changes the chemical parameter by introducing substance A with specific functional groups (R1 being hydrogen, oxygen radical, hydrocarbon group or alkoxy group, and R2-R5 being hydrogen or hydrocarbon groups). This parameter change modifies the chemical environment to prevent unwanted polymerization and gel formation, stabilizing the composition during storage.
2Stability of the object's composition
If polymerization inhibitor is added in high amount to suppress gel formation, then storage stability is improved, but curable property deteriorates leading to inferior wear resistance
Solution Approach 1:
Substance A acts as a selective intermediary that inhibits unwanted polymerization during storage (improving storage stability) while allowing controlled polymerization during UV curing (maintaining wear resistance). This dual functionality eliminates the need for high concentrations of conventional polymerization inhibitors that would compromise curable properties.
Solution Approach 2:
The patent changes the chemical parameter by using substance A with specific molecular structure (formula (1)) that provides different functionality compared to conventional polymerization inhibitors. This substance allows the system to achieve both storage stability and curable property without the trade-off inherent in using high amounts of traditional inhibitors.
3Illumination intensity
If metal particles are used to enhance gloss, then appearance properties are improved, but ejection stability deteriorates due to viscosity increase
Solution Approach 1:
Substance A serves as a dispersing intermediary between metal particles and the ink jet medium, preventing aggregation and maintaining uniform distribution. This intermediary action reduces viscosity increase and maintains ejection stability while preserving the gloss-enhancing effect of metal particles.
Solution Approach 2:
The patent creates a composite system consisting of metal particles, polymerizable compound, and substance A. This composite formulation achieves synergistic effects where substance A enhances the dispersion and stability of metal particles, maintaining both gloss properties and ejection characteristics suitable for ink jet application.
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 treated ultraviolet ray curable ink jet composition achieves superior storage stability, ejection stability, and wear resistance, while effectively showcasing the inherent gloss and durability of printed objects, even when using aluminum particles.
Implementation Method 1
a composition (ultraviolet ray curable ink jet composition), which includes a polymerizable compound and can be cured due to ultraviolet ray irradiation
Implementation Method 2
metal particles subjected to a surface treatment
Data Source
AI summary
An ultraviolet ray curable ink jet composition of the present invention is characterized by being adapted to be ejected using an ink jet method and containing:a polymerizable compound;metal particles subjected to a surface treatment; anda substance A having a partial structure represented by the following formula (1),where R1 is a hydrogen atom, an oxygen radical, a hydrocarbon group or an alkoxy group, and each of R2, R3, R4 and R5 is independently a hydrogen atom or a hydrocarbon group.