Ink-Jet Ink Composition for Fast Curing and Rubfast Images
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Solution Overview
Problem
Existing ink jet inks face challenges in preservation stability and rubfastness of recorded images, particularly when curing is rapid, leading to insufficient film strength and adhesion.
Innovation Solution
The ink formulation includes a specific ratio of water-soluble organic solvent to polymerizable monomer (Ws/Wm) and a controlled HSP distance (ΔHSP(s-m)) to promote polymerizable monomer seepage between particles while maintaining ink stability, enhancing curing and image adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rapid curing is performed to improve productivity, then curing speed increases, but film strength and adhesion deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully controlling the HSP distance between solvent and monomer within a specific range (5-15 MPa^0.5) and adjusting the Ws/Wm ratio to achieve optimal curing conditions. This allows the system to balance curing speed with film strength development, resolving the contradiction between rapid curing and adequate film formation.
Solution Approach 2:
The patent utilizes the concept of discarding and recovering by allowing controlled monomer migration during the curing process. The monomer initially dispersed in particles migrates to the film interface during curing, enhancing adhesion without compromising the overall curing speed and film strength.
2Strength
If polymerizable monomer content is increased to improve adhesion, then adhesion improves, but preservation stability deteriorates
Solution Approach 1:
The patent resolves this contradiction through parameter changes by controlling the HSP distance between solvent and monomer within a specific range (5-15 MPa^0.5) and adjusting the Ws/Wm ratio. These controlled parameter changes enable sufficient monomer availability for adhesion while preventing excessive monomer migration that would compromise preservation stability.
3Strength
If solvent content is increased to improve monomer seepage, then monomer migration improves, but ink stability deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the HSP distance between solvent and monomer within a specific range (5-15 MPa^0.5) and adjusting the Ws/Wm ratio. These controlled changes enable sufficient monomer seepage for effective curing while maintaining ink stability during storage and 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 formulation achieves high preservation stability and rubfastness of recorded images by balancing solvent and monomer ratios and HSP distances, improving curing efficiency and image durability.
Implementation Method 1
The ink includes water, a water-soluble organic solvent, and particles including a polymer P and a polymerizable monomer M... ΔHSP(s-m), which is an HSP distance between the water-soluble organic solvent and the polymerizable monomer M
Implementation Method 2
an ink jet recording method including a first step of ejecting and landing, to a recording medium, from a head, droplets of a photocurable ink composition... and a third step of irradiating the image having been subjected to the second step, with light
Data Source
AI summary
An ink jet ink including water, a water-soluble organic solvent, and particles including a polymer P and a polymerizable monomer M, wherein, when a mass content of the water-soluble organic solvent is defined as Ws and a mass content of the polymerizable monomer M is defined as Wm, a Ws/Wm ratio is 1.1 or more, and ΔHSP(s-m), which is an HSP distance between the water-soluble organic solvent and the polymerizable monomer M, is 15.0 MPa1/2 to 25.0 MPa1/2, and an inkjet recording method.