Aqueous Ink Composition with Lactam Stabilization for Reliable Jetting
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Solution Overview
Problem
Ink jet recording methods face issues with ink transfer and ejection reliability due to insufficient permeation into recording media, leading to adherence to transporting rollers and other surfaces, and the use of resin particles for fixing resins often causes aggregation and ejection reliability problems.
Innovation Solution
An ink composition comprising a pigment, an acetylene glycol-based surfactant with an HLB value of 5 or less, a lactam compound with a 6- to 8-membered lactam ring, and a water-soluble resin, which improves permeability and ejection reliability while suppressing transfer and phase separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If resin particles are used as fixing resins to suppress ink transfer, then ink transfer is suppressed, but ejection reliability decreases and aggregates are generated in the ink container
Solution Approach 1:
The invention extracts and eliminates resin particles from the ink composition, replacing them with a resin-free system that uses specific surfactants and solvents to achieve both transfer suppression and maintained ejection reliability without aggregate formation
Solution Approach 2:
The invention changes the chemical parameters of the ink composition by specifying particular surfactant types (acetylene glycol-based with HLB value of 5 or less) and solvent components, creating a resin-free formulation that maintains both transfer resistance and ejection reliability
2Productivity
If recording medium is transported and discharged before ink is sufficiently dried, then productivity is improved, but ink transfer occurs to transporting rollers and stacked media
Solution Approach 1:
The invention applies preliminary action by using specific surfactants and solvent components that accelerate ink drying and fixation on the recording medium, allowing the ink to set quickly enough to prevent transfer during subsequent handling and stacking operations
Solution Approach 2:
The invention changes the evaporation and drying parameters of the ink through carefully selected solvent components and surfactants, enabling sufficiently rapid drying that allows high-speed transport and stacking without ink transfer
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 effectively prevents ink transfer and maintains ejection reliability by enhancing permeability and stability, using a synergistic effect of the specified components.
Implementation Method 1
an acetylene glycol-based surfactant having an HLB value of 5 or less
Implementation Method 2
a water-soluble resin dissolved in the solvent component, in which the content of the water-soluble resin is 0.3% by mass or more
Implementation Method 3
a lactam compound having a 6- to 8-membered lactam ring
Data Source
AI summary
An ink jet ink composition includes a pigment; an acetylene glycol-based surfactant having an HLB value of 5 or less; a lactam compound having a 6- to 8-membered lactam ring; a solvent component; and a water-soluble resin dissolved in the solvent component, in which the content of the water-soluble resin is 0.3% by mass or more based on the total mass of the ink jet ink composition, the solvent component includes water, and the ink jet ink composition is an aqueous ink.