Aqueous Ink Pigment Aggregation Control
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Solution Overview
Problem
Ink jet recording systems face issues with unclear contours and color bleeding when using multiple pigments due to differences in reactivity with a reaction liquid, leading to color unevenness and strike-through to the back surface of the recording medium.
Innovation Solution
An aqueous ink with at least two pigments, where the difference in precipitation value to the reaction liquid is controlled to 0.2 or less, is used, along with a reaction liquid containing reactive components such as polyvalent metal ions and cationic compounds, to ensure uniform aggregation and prevent color bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple pigments with different reactivity are used in ink, then image density and color quality are improved, but color unevenness and strike-through occur due to differential aggregation behavior
Solution Approach 1:
The patent changes the chemical parameters of the reaction liquid by specifying precise compositional ratios (polyvalent metal salt 0.01-5 mass%, cationic compound 0.01-5 mass%, anionic compound 0.01-5 mass%) to control the aggregation behavior of multiple pigments. This parameter optimization ensures uniform precipitation values across different pigments, eliminating color unevenness while maintaining high image density.
Solution Approach 2:
The patent uses a composite reaction liquid containing multiple reactive components (polyvalent metal salts, cationic compounds, and anionic compounds) that work synergistically to control pigment aggregation. This composite approach allows simultaneous optimization of aggregation uniformity and image quality for multi-pigment inks.
2Manufacturing precision
If reaction liquid with high reactivity is used to improve image density, then aggregation is enhanced, but contour clarity deteriorates due to excessive spreading
Solution Approach 1:
The patent optimizes the concentration parameters of reactive components in the reaction liquid, maintaining polyvalent metal salts, cationic compounds, and anionic compounds within 0.01-5 mass% ranges. This controlled reactivity enables sufficient aggregation for high image density while preventing excessive spreading that would blur contours.
3Stability of the object's composition
If ink formulation is optimized for uniform aggregation, then color evenness is improved, but strike-through to back surface increases
Solution Approach 1:
The patent creates localized aggregation zones on the recording medium surface by controlling the interaction between ink components and reaction liquid. The optimized formulation ensures aggregation occurs primarily at the ink droplet periphery and surface, forming a barrier layer that prevents pigment penetration to the back surface while maintaining uniform color distribution.
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
This approach results in clear contours, reduced color unevenness, and improved strike-through characteristics, producing high-quality images without bleeding or unevenness, even when using multiple pigments.
Implementation Method 1
a reaction liquid containing a reactive component that reacts with the aqueous ink to cause aggregation or gelation of the aqueous ink
Implementation Method 2
the at least two pigments have a difference in precipitation value to the reaction liquid of 0.2 or less
Data Source
AI summary
An aqueous ink comprising water, a water-soluble organic solvent and at least two pigments. The aqueous ink is used together with a reaction liquid containing a reactive component that reacts with the aqueous ink to cause aggregation or gelation of the aqueous ink. The at least two pigments have a difference in precipitation value to the reaction liquid of 0.2 or less.