Ink Set with Specific Dyes for Fastness and Drying
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Solution Overview
Problem
Inkjet recording methods face challenges in maintaining lightfastness, ozonefastness, and humidityfastness across different ink compositions, leading to uneven image degradation and poor color balance, especially with rapid drying requirements in high-speed printing.
Innovation Solution
An ink set comprising specific compounds in the cyan, magenta, and yellow ink compositions, including phthalocyanine-based dyes and urea derivatives, is developed to enhance lightfastness, ozonefastness, and humidityfastness, while a black ink composition with specific colorants ensures balanced degradation and rapid drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional ink compositions are used to achieve rapid drying properties, then drying speed is improved, but lightfastness, ozonefastness, and humidityfastness deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully adjusting the pH values of different ink compositions (cyan: 8.0-10.5, magenta: 7.0-9.5, yellow: 4.0-7.0, black: 8.0-10.5) and controlling the concentration ranges of specific dye compounds. These parameter optimizations enable the ink to dry rapidly while maintaining excellent fastness properties, resolving the contradiction between drying speed and image stability.
Solution Approach 2:
The patent uses composite materials by combining multiple specific dye compounds in each ink composition (e.g., cyan ink contains C.I. Direct Blue 199 and C.I. Acid Blue 9, magenta ink contains C.I. Direct Red 227 and C.I. Acid Red 52). These composite formulations achieve both rapid drying and superior fastness properties that individual dyes cannot provide alone.
2Reliability
If ink compositions are optimized for individual fastness properties, then that specific property is improved, but color balance and overall image quality deteriorate
Solution Approach 1:
The patent applies local quality by optimizing each ink composition individually with specific pH ranges and dye concentrations tailored to that color's requirements. Cyan ink uses pH 8.0-10.5 with specific blue dyes, magenta uses pH 7.0-9.5 with specific red dyes, yellow uses pH 4.0-7.0 with specific yellow dyes, and black uses pH 8.0-10.5 with specific black dyes. This localized optimization ensures each color achieves its best fastness properties while maintaining overall color balance.
Data Source
AI summary
An ink set including at least a yellow ink composition, a magenta ink composition, and a cyan ink composition; the magenta ink composition containing as a colorant at least one type of compound expressed by the Formula M-1 in claim 1; the yellow ink composition containing as a colorant at least one type of compound expressed by the formula Y-1 in claim 1; and the cyan ink composition containing as a colorant at least one type of compound selected from the group consisting of compounds or salts thereof expressed by the Formula C-1 in claim 1.