Azo Coloring Composition for Inkjet Light Fastness and Stability
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Solution Overview
Problem
Existing inkjet recording technologies face challenges in achieving long-term storage stability and high light fastness, ozone gas fastness, and moisture fastness, particularly in yellow inks, due to compatibility issues and impurities that cause clogging and reduced performance in inkjet recording devices.
Innovation Solution
A coloring composition comprising a first azo compound represented by Formula (Y) and a second azo compound selected from Group A, with specific mass ratios and ionic forms, particularly using potassium ions, to enhance light fastness, ozone gas fastness, and moisture fastness while preventing clogging and improving storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coloring material with excellent light fastness is used, then image light fastness is improved, but ink storage stability deteriorates due to concentration changes under high humidity
Solution Approach 1:
The patent uses a composite coloring material consisting of a specific azo compound (Formula Y) combined with a coupling component (Formula C or D). This composite structure achieves both excellent light fastness and ink storage stability by synergistically combining the properties of the azo compound and the coupling component, preventing concentration changes under high humidity while maintaining image quality.
2Reliability
If a structural analog of a colorant is added to improve image preservation properties, then light fastness is improved, but ink supply path clogging and reduced storage stability occur
Solution Approach 1:
The patent changes the chemical structure parameters by using a specific azo compound (Formula Y) with defined molecular characteristics and combining it with specific coupling components (Formula C or D). This parameter optimization ensures the coloring material maintains solubility and prevents precipitation, thereby avoiding ink supply path clogging while achieving excellent image preservation properties.
3Ease of manufacture
If impurities are present in the ink, then production cost is reduced, but ink storage stability and recording performance deteriorate
Solution Approach 1:
The patent applies local quality control by specifying precise structural requirements for the azo compound (Formula Y) and coupling components (Formula C or D). This targeted molecular design ensures high purity of the coloring material without requiring excessive purification processes, achieving both cost-effectiveness and excellent ink storage stability.
Data Source
AI summary
Provided are a coloring composition and an azo compound useful in a yellow ink composition or an ink for inkjet recording, which may provide an image excellent in light fastness, ozone gas fastness and moisture fastness, and form an image excellent in hue, and at the same time may suppress clogging of an ink supply path or sufficiently satisfy storage stability. A coloring composition containing at least a first coloring material and at least a second coloring material, in which the first coloring material is a compound represented by the following Formula (Y), the second coloring material is, for example, the following compound 8, and the mass ratio of the content (% by mass) of the second coloring material in the composition to the content (% by mass) of the first coloring material in the composition is 0.001 to 1.0. In Formula (Y), a plurality of M each independently represent a hydrogen atom or a cation, and when M represents a cation, M represents a Li+ ion, a Na+ ion, a K+ ion or a NH4+ ion.