Ink Jet Ink Composition With Impurity-Controlled Violet Colorant
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Solution Overview
Problem
The use of 1,4-diamino-2,3-dichloroanthraquinone (C.I. Disperse Violet 28) in ink jet inks results in poor color saturation and storage stability of dyed products due to the presence of impurities detected in high-performance liquid chromatography (HPLC) analysis.
Innovation Solution
An ink jet ink composition comprising a colorant with 1,4-diamino-2,3-dichloroanthraquinone, an anionic dispersant, water, a surfactant, and a water-soluble organic solvent, where the peak areas of specific impurities in HPLC analysis are limited to enhance color saturation and storage stability, with a glycerol and glycol-based solvent system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 1,4-diamino-2,3-dichloroanthraquinone (C.I. Disperse Violet 28) is used as a colorant in ink jet ink, then the ink can provide coloring function, but the color saturation of dyed product is poor and storage stability is poor due to presence of impurities
Solution Approach 1:
The patent extracts and removes impurities (compounds B and C) from the colorant composition through purification processes. By setting specific peak area limits in HPLC analysis (compound B ≤1.4%, compound C ≤0.8%), the invention selectively eliminates harmful impurities while retaining the main coloring compound (compound A), thereby resolving the contradiction between storage stability and color saturation.
Solution Approach 2:
The patent changes the compositional parameters of the colorant by strictly controlling the peak areas of impurities in HPLC analysis. By defining specific quantitative limits for compounds B and C relative to compound A, the invention optimizes the colorant composition to achieve both high color saturation and excellent storage stability, transforming a problematic material into a high-performance colorant.
2Ease of manufacture
If 1,4-diamino-2,3-dichloroanthraquinone is used as a dye in ink jet printing, then the ink can be formulated with this colorant, but the dyed product exhibits poor color saturation and poor storage stability
Solution Approach 1:
The patent applies preliminary purification action to the colorant before ink formulation. By pre-establishing strict peak area limits for impurities (compound B ≤1.4%, compound C ≤0.8%) through HPLC analysis and implementing purification processes beforehand, the invention ensures that the colorant is ready for ink formulation without causing subsequent storage stability problems, thus resolving the contradiction between ease of manufacture and reliability.
3Productivity
If the colorant contains impurities detected by HPLC analysis, then the ink can be produced more easily, but the storage stability of the ink deteriorates
Solution Approach 1:
The patent changes the purity parameters of the colorant by establishing specific peak area thresholds in HPLC analysis (compound B ≤1.4%, compound C ≤0.8%). This quantitative parameter control enables systematic purification processes that remove impurities while maintaining production efficiency, resolving the contradiction between productivity and storage stability.
Data Source
AI summary
An ink jet ink composition includes: a colorant including a compound (A) represented by formula (1) below; an anionic dispersant; water; a surfactant; and a water-soluble organic solvent. In high-performance liquid chromatography (HPLC) analysis of the colorant at a measurement wavelength of 500 nm, the peak area of a compound (B) represented by formula (2) is 1.4% or less based on 100% of the total peak area of the colorant, and the peak area of a compound (C) represented by formula (3) is 0.8% or less based on 100% of the total peak area of the colorant. The water-soluble organic solvent includes a glycerol and a glycol.