Ink Pigment Solid Solution for Red Color Reproduction
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Solution Overview
Problem
Conventional magenta inks for ink jet recording fail to reproduce high-quality red colors with high storage stability and glossy images on glossy paper without compromising glossiness, similar to silver-halide photography.
Innovation Solution
A solid solution of C.I. Pigment Red 202 and C.I. Pigment Violet 19 is used, with specific particle size distribution conditions, including average particle diameters and polymer dispersion, to enhance storage stability and chroma and glossiness of the recorded image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magenta ink is used, then the ink storage stability is maintained, but the color reproduction quality in the red region and glossiness are insufficient
Solution Approach 1:
The invention changes the chemical composition parameters by using a solid solution of C.I. Pigment Red 202 and C.I. Pigment Violet 19 instead of conventional single pigments, and optimizes particle size parameters (average particle diameter 0.5-5.0 μm, with 80% or more being 0.2-2.0 μm) to simultaneously achieve high storage stability and superior color reproduction quality in the red region
Solution Approach 2:
The invention creates a composite pigment system by forming a solid solution of two different pigments (C.I. Pigment Red 202 and C.I. Pigment Violet 19) in specific ratios, which combines the advantages of both pigments to achieve both storage stability and high-quality color reproduction that neither pigment could achieve alone
2Strength
If pigment ink is used to improve fastness properties, then the color fastness is improved, but the glossiness of the recorded image is lowered
Solution Approach 1:
The invention applies local quality control by optimizing the particle size distribution of the pigment particles, ensuring that the majority of particles (80% or more) fall within a specific size range (0.2-2.0 μm), which creates uniform deposition and maintains surface glossiness while preserving color fastness properties
3Adaptability or versatility
If the color reproduction range is broadened, then the color quality is improved, but the glossiness of the recorded image decreases
Solution Approach 1:
The invention broadens the color reproduction range by using a solid solution of two pigments with complementary color properties (C.I. Pigment Red 202 and C.I. Pigment Violet 19), while controlling the particle size parameters to ensure smooth deposition that maintains glossiness, thus achieving both broader color range and preserved glossiness
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 achieves high storage stability and improved chroma and glossiness in the red color region with a broader color reproduction range, comparable to silver-halide photography, by maintaining the desired particle size distribution and using polymers for dispersion.
Implementation Method 1
a solid solution of C.I. Pigment Red 202 and C.I. Pigment Violet 19 which are respectively a quinacridone pigment... the particle size of the pigment and ratio of the primary particle size to the secondary particle size are defined
Data Source
Figure 1
AI summary
An ink contains at least a pigment, wherein the pigment is a solid solution of C.I. Pigment Red 202 and C.I. Pigment Violet 19, and a primary particle diameter D (nm) of the pigment and a 50%-cumulative diameter D50 (nm) in particle diameter distribution of the pigment satisfy a relation of D×0.95 ≤(=<) D50 ≤(=<) 130, and a 90%-cumulative diameter D90 (nm) in particle diameter distribution of the pigment and the 50%-cumulative diameter D50 (nm) satisfy a relation of 1.5 ≤(=<) D90/D50 ≤(=<) 2.2.