Ink Set Color Reproducibility Heterocyclic Compound
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Solution Overview
Problem
Existing ink sets for color ink jet recording face challenges in achieving improved color reproducibility and gloss, particularly in reproducing human skin tones, with issues like granularity deterioration, greenish tint, and rainbow colors due to interference, especially on glossy media.
Innovation Solution
An ink set comprising specific magenta, yellow, cyan, orange, green, and black ink compositions with defined pigment ratios and types, including γ-type C.I. pigment violet 19 and C.I. pigment red 202, and additives like titanium dioxide, along with surfactants and wetting agents, to enhance color development and gloss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pigment solid component concentration of C ink is increased to improve color reproducibility, then color saturation improves, but interference color (reddish tint) occurs at dark areas of human skin color
Solution Approach 1:
The patent changes the chemical composition parameters of the C ink by incorporating a specific heterocyclic compound with nitrogen atoms in the molecule. This compound modifies the absorption characteristics of the C ink, allowing it to maintain color saturation while reducing the reddish interference color at dark skin tones. The nitrogen-containing heterocyclic structure alters the way light interacts with the ink pigment.
Solution Approach 2:
The patent creates a composite ink formulation by combining traditional cyan pigments with a specific heterocyclic compound containing nitrogen. This composite material approach allows the C ink to achieve both color saturation and reduced interference color by leveraging the complementary properties of the pigment and the heterocyclic additive.
2Device complexity
If conventional YMC ink sets are used to simplify the ink composition, then device complexity is reduced, but color reproducibility of human skin tones deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the C ink by introducing a nitrogen-containing heterocyclic compound. This parameter change enables the conventional three-color YMC system to achieve superior human skin tone reproduction without adding more ink cartridges or complexing the overall printing system architecture.
3Object-generated harmful factors
If the concentration of pigment solid component is kept low to reduce interference color, then interference color is suppressed, but gloss and color saturation deteriorate
Solution Approach 1:
The patent formulates a composite C ink containing both cyan pigment and a specific nitrogen-containing heterocyclic compound. This composite formulation allows the ink to maintain low pigment concentration (reducing interference color) while the heterocyclic compound compensates for any loss in color saturation and enhances gloss through its optical properties.
Data Source
AI summary
An ink set, provided with at least a magenta ink composition, a yellow ink composition and a cyan ink composition, wherein the magenta ink composition has an L* value of 60 or more and a b* value of −17 or less when the CIE standard a* value as calculated from the visible absorption spectrum in an aqueous solution diluted 10,000-fold or less is 80.