Ink Composition Preventing Mottling on Low Absorption Media
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Solution Overview
Problem
Inkjet recording methods using recording materials with low ink absorption capabilities often result in mottling phenomena, leading to irregular image unevenness and poor rubfastness of printed images.
Innovation Solution
An ink composition comprising a compound represented by a specific formula, a colorant, a dispersant, and a C4-C12 alkanediol, which is used in an inkjet recording method to attach droplets to a recording material, preventing mottling and enhancing image quality and rubfastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If aqueous pigment ink is used on recording materials with low ink absorption capability, then productivity and ease of operation are improved, but manufacturing precision deteriorates due to mottling phenomenon causing irregular image unevenness
Solution Approach 1:
The patent introduces a specific surfactant compound (formula 1) as an intermediary substance that mediates between the ink and the recording material. This surfactant modifies the surface properties of the recording material to improve ink absorption and distribution, preventing mottling while maintaining high-speed printing capability on non-absorptive media
Solution Approach 2:
The patent changes the chemical composition parameters of the ink by incorporating a specific surfactant with defined molecular structure (formula 1) at controlled concentrations (0.1-10 wt%). This parameter change modifies the ink's interaction with the recording material surface, enabling uniform absorption and eliminating mottling phenomenon
2Ease of operation
If ink is used on recording materials with low ink absorption capability, then ease of operation is improved, but reliability deteriorates due to poor rubfastness of printed images
Solution Approach 1:
The surfactant compound acts as an intermediary that enhances the bonding between ink particles and the recording material surface. By modifying surface energy and improving wetting properties, it ensures reliable adhesion of printed images even on materials with low inherent ink absorption capability
Solution Approach 2:
The patent creates a composite system by combining the ink formulation with a specifically designed surfactant molecule (formula 1). This composite approach integrates multiple functional properties - surfactancy, adhesion promotion, and mottling prevention - into a single ink composition that delivers reliable rubfastness across diverse recording materials
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 mottling and achieves high-quality, rubfast images on low ink absorption materials, maintaining image quality and toughness properties like water resistance and light resistance.
Implementation Method 1
controlling the permeability of paper by means of a surfactant and a penetrant
Implementation Method 2
controlling the permeability of paper by means of a surfactant and a penetrant
Implementation Method 3
a dispersant
Data Source
AI summary
An ink composition that offers a recorded image having rubfastness and having high quality without causing a mottling phenomenon, an inkjet recording method using the same, and a colored article. The ink composition includes a compound represented by the following formula (1):a colorant, a dispersant, and a C4-C12 alkanediol, in which the content of the compound represented by formula (1) is 0.1 to 5% by mass. In the formula (1), R1 represents a hydroxy group or the like, R2 represents an alkyl group or the like, R3 represents an alkyl group or the like, R4 represents a hydrogen atom or the like, and R5 represents an alkyl group.