Quinacridone Solid Solution Pigment Production
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Solution Overview
Problem
Conventional quinacridone solid solution pigments fail to produce colored products with high chroma and a desired yellowish hue, and struggle to control particle diameter uniformly, which is essential for inkjet ink applications.
Innovation Solution
A method involving the co-cyclization of diarylaminoterephthalic acid and dialkylarylaminoterephthalic acid in polyphosphoric acid to create a water-containing crude quinacridone solid solution, followed by drying to reduce water content below 1% and heating in a solvent like dimethyl sulfoxide to achieve a quinacridone solid solution pigment with controlled particle diameter and desired hue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional quinacridone solid solution pigments are used, then the production process is simple, but the chroma of the colored product is insufficient and the hue cannot achieve the desired yellowish tone
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratio of unsubstituted quinacridone to 2,9-dialkylquinacridone (80:20 to 70:30 mass ratio) and controlling water content during production. By changing these compositional parameters and processing conditions (drying to less than 1% water content, heating in specific solvents), the patent achieves high chroma and proper yellowish hue in the colored product while maintaining a feasible production process
Solution Approach 2:
The patent creates a composite material system by forming a solid solution of unsubstituted quinacridone and 2,9-dialkylquinacridone in specific ratios. This composite pigment structure, with controlled water content and particle characteristics, enables simultaneous achievement of high chroma, proper yellowish hue, and uniform particle diameter control
2Manufacturing precision
If conventional methods are used to produce fine pigment particles, then the particle size is reduced, but the particle diameter cannot be uniformly controlled
Solution Approach 1:
The patent applies preliminary action by controlling the composition and water content of the crude quinacridone solid solution before the pigmentation step. By pre-establishing the correct ratio of quinacridone components and reducing water content to less than 1% before heating in solvent, the patent enables uniform particle diameter control in the final pigment product
Solution Approach 2:
The patent uses parameter changes by controlling processing conditions including heating temperature (60-120°C in dimethyl sulfoxide), composition ratios, and water content during production. These parameter controls enable the formation of pigment particles with uniform diameter suitable for inkjet applications
3Manufacturing precision
If a quinacridone solid solution with yellowish hue is developed, then the market demand is met, but the chroma remains insufficient
Solution Approach 1:
The patent resolves this contradiction by changing the compositional parameters to a specific mass ratio of unsubstituted quinacridone to 2,9-dialkylquinacridone (80:20 to 70:30) and controlling water content to less than 1%. This precise parameter control enables the pigment to exhibit both the desired yellowish hue and high chroma in colored products
Solution Approach 2:
The patent creates a composite pigment material combining unsubstituted quinacridone and 2,9-dialkylquinacridone in optimized ratios. This composite structure, combined with controlled water content and particle characteristics, achieves both high chroma and proper yellowish hue while maintaining production feasibility
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 method produces quinacridone solid solution pigments that result in colored products with high chroma and a properly yellowish hue, and allows for stable control of particle diameter, making them suitable for inkjet ink applications with improved ejection stability.
Implementation Method 1
a diarylaminoterephthalic acid and a dialkylarylaminoterephthalic acid are subjected to a co-cyclization reaction in polyphosphoric acid, thereby obtaining a water-containing crude quinacridone solid solution
Implementation Method 2
in the drying step, the water-containing crude quinacridone solid solution is dried, thereby making a water content less than 1%
Implementation Method 3
in the pigmentation step, the powdery, crude quinacridone solid solution is heated in a liquid medium that does not dissolve the crude quinacridone solid solution
Data Source
AI summary
The present invention relates to a technique for providing a quinacridone solid solution pigment, by which a quinacridone solid solution pigment that allows a colored product to have high chroma and a properly yellowish hue, and suitably, that has a controlled particle diameter and has the above-described, desired hue can be obtained. The present invention provides a method for producing a quinacridone solid solution pigment, wherein a diarylaminoterepththalic acid and a dialkylarylaminoterephthalic acid are subjected to a co-cyclization reaction in polyphosphoric acid, thereby obtaining a water-containing crude quinacridone solid solution such that water is contained in a solid solution having a mass ratio of unsubstituted quinacridone to a 2,9-dialkylquinacridone of 85:15 to 60:40; the water-containing crude quinacridone solid solution obtained above is dried in a drying step, thereby obtaining a powdery, crude quinacridone solid solution having a water content of less than 1%; and the powdery, crude quinacridone solid solution is heated in a liquid medium that does not dissolve the crude quinacridone solid solution in a pigmentation step, and the present invention also provides a pigment dispersion liquid and an inkjet ink each containing the obtained quinacridone solid solution pigment.