Radiation-Curable Ink Jet Composition for Low-Viscosity Flexible Films
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Solution Overview
Problem
Existing radiation curable ink jet compositions face issues with solubility and viscosity due to the use of acylphosphine oxide-based photopolymerization initiators, which are solid at room temperature, limiting the selection of polymerizable monomers and leading to potential cracking and chipping during post-processing, such as cutting and bending.
Innovation Solution
A radiation curable ink jet composition with a monofunctional monomer content of 90% by mass or more and a photopolymerization initiator comprising ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate, which is liquid at room temperature, improving solubility and reducing viscosity, thereby enhancing the physical properties of the ink coating film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acylphosphine oxide-based photopolymerization initiator is used, then photopolymerization can be achieved, but solubility is poor and viscosity increases
Solution Approach 1:
The patent changes the physical state parameter of the photopolymerization initiator from solid (acylphosphine oxide-based) to liquid (ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate) at room temperature. This parameter change improves solubility in the ink composition without sacrificing photopolymerization capability, directly resolving the contradiction between reliability and ease of manufacture.
2Reliability
If acylphosphine oxide-based photopolymerization initiator is used, then photopolymerization can be achieved, but viscosity increases
Solution Approach 1:
The patent changes the viscosity parameter by selecting a liquid photopolymerization initiator (ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate) instead of solid acylphosphine oxide-based initiators. This reduces the overall viscosity of the ink composition while maintaining photopolymerization capability, resolving the contradiction between reliability and viscosity.
3Ease of manufacture
If aromatic-based monomer is used to dissolve photopolymerization initiator, then solubility is improved, but selection range of other monomers is narrowed
Solution Approach 1:
The patent changes the chemical structure parameter of the photopolymerization initiator to ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate, which has different solubility characteristics compared to acylphosphine oxide-based initiators. This allows the use of non-aromatic monomers like cyclohexane rings and aliphatic chains, expanding the monomer selection range while maintaining good solubility, thus resolving the contradiction between ease of manufacture and adaptability.
4Ease of manufacture
If conventional monomer composition is used, then ink coating film can be formed, but cracking and chipping occur during post processing
Solution Approach 1:
The patent changes the physical properties of the cured film by selecting specific monomers (cyclohexane ring-containing compounds and aliphatic chain-containing compounds) that provide flexibility and adhesion. Combined with the liquid photopolymerization initiator, this creates a coating film with improved resistance to cracking and chipping during post-processing while maintaining ease of film formation, resolving the contradiction between ease of manufacture and reliability.
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 improved adhesion, flexibility, and abrasion resistance of the ink coating film while maintaining low viscosity, addressing the limitations of traditional compositions.
Implementation Method 1
a radiation curable ink jet composition comprising: polymerizable compounds; and a photopolymerization initiator
Data Source
AI summary
A radiation curable ink jet composition includes polymerizable compounds and a photopolymerization initiator, the polymerizable compounds include a monofunctional monomer, a content of the monofunctional monomer with respect to a total mass of the polymerizable compounds is 90 percent by mass or more, and the photopolymerization initiator includes ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate.