Ink Set Resin Coating for Abrasion Resistance and Ejection Stability
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Solution Overview
Problem
Conventional ink sets for inkjet recording lack sufficient abrasion resistance and stability, leading to issues with ink ejection and image quality, particularly when the content ratio of resin components is increased to enhance abrasion resistance, resulting in adhesion problems with the ejection head and decreased landing position precision.
Innovation Solution
An ink set comprising an ink composition with a resin that partially coats the pigment, featuring a structural unit represented by Formula (1) and an ionic group, combined with a treatment liquid containing a cationic polymer, which enhances aggregability and interaction with the resin-coated pigment, improving abrasion resistance and ejection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the content ratio of resin component in the ink is increased to improve abrasion resistance, then abrasion resistance is improved, but the ink readily adheres to the ejection head causing ejection instability and deteriorated landing position precision
Solution Approach 1:
The patent changes the chemical parameters of the resin by specifying a copolymer with particular structural units (Formula 1 with specific L1 groups like -COO-, -CONR2-, -O- or phenylene groups) and controlled composition ratios (5-50 mass%). This parameter optimization allows the resin to provide adequate abrasion resistance while maintaining ejection stability by preventing excessive adhesion to the ejection head.
Solution Approach 2:
The patent uses a composite resin system consisting of a copolymer with specific structural units (Formula 1) combined with other polymer components. This composite approach balances the hydrophobic properties needed for abrasion resistance with sufficient solubility characteristics to prevent ejection head adhesion, thereby resolving the contradiction between strength and reliability.
2Strength
If the content ratio of resin component in the ink is increased to improve abrasion resistance, then abrasion resistance is improved, but landing position precision is deteriorated
Solution Approach 1:
The patent optimizes the chemical composition parameters of the resin, specifying a copolymer with structural units represented by Formula (1) where L1 represents specific groups (-COO-, -CONR2-, -O- or phenylene groups) and controlling the resin content at 5-50 mass%. This precise parameter control ensures adequate abrasion resistance while maintaining proper ink flow characteristics for accurate landing position.
Solution Approach 2:
The patent employs a composite resin system with specific copolymer structures (Formula 1) that balances mechanical strength for abrasion resistance with fluidity characteristics for precise inkjet deposition. The composite nature of the resin allows simultaneous optimization of both abrasion resistance and landing position precision.
3Strength
If conventional resin components are used for coating pigment, then the ink can be formulated, but the image lacks sufficient abrasion resistance when external force is applied
Solution Approach 1:
The patent changes the chemical structure parameters of the coating resin by specifying a copolymer with structural units of Formula (1) where L1 represents specific functional groups (-COO-, -CONR2-, -O- or phenylene groups). This structural modification enhances the resin's ability to adhere to pigment particles and provide superior abrasion resistance compared to conventional resins.
Solution Approach 2:
The patent uses a composite resin system with copolymer structures (Formula 1) that combines multiple functional units to achieve both adequate pigment coating and enhanced abrasion resistance. This composite approach provides superior image quality and durability compared to single-component conventional resins.
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 set achieves superior abrasion resistance and image quality with reduced ejection defects and prevention of white spots, ensuring stable and high-resolution images over a long period.
Implementation Method 1
a treatment liquid comprising a cationic polymer having reactivity to the pigment at least partially coated with the resin
Implementation Method 2
an ink composition containing at least water, a pigment, and a resin at least partially coating a surface of the pigment and having a structural unit represented by the following Formula (1) and a structural unit having an ionic group
Data Source
AI summary
Disclosed is an ink set including: an ink composition containing at least water, a pigment, and a resin at least partially coating a surface of the pigment and having a structural unit represented by the following Formula (1) and a structural unit having an ionic group; and a treatment liquid containing a cationic polymer having reactivity to the pigment at least partially coated with the resin,wherein, in Formula (1), R1 represents a hydrogen atom, a methyl group or a halogen atom; L1 represents *—COO—, *—OCO—, *—CONR2—, *—O—, or a substituted or unsubstituted phenylene group; R2 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms; the symbol “*” in the L1 represents a bond linked to the main chain; and L2 represents a single bond or a bivalent linking group having 1 to 30 carbon atoms.