Photo-curable Ink Composition for Solvent Resistance and Gloss
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Solution Overview
Problem
Current photocurable ink compositions lack solvent resistance and glossiness in the cured films produced, which are essential for durable and aesthetically pleasing images in inkjet recording methods.
Innovation Solution
A photocurable ink composition comprising a resin with an amino group having one or more hydrogen atoms on a carbon atom at the α-position and an amine value of 4.2 mmol/g to 12 mmol/g, combined with radically polymerizable monomers, including monofunctional and bifunctional monomers, and specific photopolymerization initiators, sensitizers, and antioxidants, to enhance curing efficiency and film properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photocurable ink compositions are used, then the ink can be jetted and cured to form images, but the cured films lack solvent resistance and glossiness
Solution Approach 1:
The patent changes the chemical parameters of the ink composition by incorporating a specific resin with amino groups having controlled amine values (3.0-20 mmol/g) and using radically polymerizable monomers with specific functional groups. This parameter optimization enables the cured film to achieve excellent solvent resistance while maintaining formulation feasibility
Solution Approach 2:
The patent creates a composite ink composition by combining multiple components: a resin containing amino groups, radically polymerizable monomers (including carboxylic acid-containing monomers), photopolymerization initiators, and optional additives. This composite approach synergistically achieves solvent resistance, glossiness, and proper curing characteristics
2Reliability
If the ink composition is formulated for high solvent resistance, then durability improves, but the formulation becomes more complex
Solution Approach 1:
The resin component with amino groups serves multiple functions simultaneously: it provides solvent resistance through its chemical structure, contributes to film formation, and enables proper curing when combined with the radically polymerizable monomers. This multi-functionality reduces the need for additional specialized additives
3Shape
If conventional ink compositions are used, then the printing process is simple, but the cured films lack glossiness
Solution Approach 1:
The patent optimizes the parameters of the radically polymerizable monomers, specifically using monomers with carboxylic acid groups and controlling their content (0.1-5 mmol/g). This parameter control enables high glossiness in the cured film while maintaining reasonable monomer quantities for practical applications
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 ink composition achieves excellent solvent resistance and glossiness in the cured films, ensuring durability and high-quality image formation suitable for various substrates, including non-absorbable plastics.
Implementation Method 1
a photocurable ink composition comprising: a resin which contains an amino group having one or more hydrogen atoms on a carbon atom at an α-position and having an amine value of 4.2 mmol/g to 12 mmol/g; and a radically polymerizable monomer
Data Source
AI summary
Provided are a photocurable ink composition including a resin which contains an amino group having one or more hydrogen atoms on a carbon atom at an α-position and having an amine value of 3.5 mmol/g to 12 mmol/g, and a radically polymerizable monomer, in which the radically polymerizable monomer contains at least one of a monofunctional radically polymerizable monomer or a bifunctional radically polymerizable monomer, a total content of the monofunctional radically polymerizable monomer and the bifunctional radically polymerizable monomer is 50% by mass or greater with respect to a total mass of the photocurable ink composition, and a content of a radically polymerizable monomer containing an acid group in the radically polymerizable monomers is 1.5 mmol or less per 100 g of the photocurable ink composition; and an image forming method performed by using the photocurable ink composition.