Azo Pigment Composition for Inkjet Recording
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current azo pigments used in color image recording materials lack sufficient light fastness and chemical stability, particularly when exposed to environmental factors like light, heat, and ozone, which affects their performance in inkjet recording and other applications.
Innovation Solution
Development of an azo pigment composition with specific crystal forms, such as α-type and β-type crystal forms, characterized by distinct X-ray diffraction peaks, which enhances dispersibility, stability, and tinctorial strength, achieved through a diazo coupling reaction and subsequent after-treatment processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional azo pigments are used to achieve good hue and tinctorial strength, then coloring performance is improved, but light fastness deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of azo pigments through specific substitutions (introducing electron-withdrawing groups like carbonyl, cyano, or nitro groups at positions 2 or 6 of the naphthol ring) and controlling crystal form (α-type or β-type) to simultaneously achieve high tinctorial strength and improved light fastness, resolving the contradiction between coloring performance and light stability
Solution Approach 2:
The patent creates composite pigment structures by combining azo pigment molecules with specific auxiliary components and controlling their assembly into defined crystal forms (α-type with space group P212121 or β-type with space group P21). This composite approach at the molecular and crystalline levels enables both strong coloring and enhanced light fastness that neither component achieves alone
2Stability of the object's composition
If pigment particle aggregation is increased to improve stability, then dispersion stability is improved, but transparency deteriorates
Solution Approach 1:
The patent controls the particle size parameter of pigment aggregates to fall within the range of 0.1 μm to 10 μm, and adjusts the degree of aggregation to achieve optimal balance. This parameter optimization ensures that pigment particles remain sufficiently dispersed for transparency while forming enough aggregation for dispersion stability, resolving the contradiction between these two requirements
3Manufacturing precision
If pigment particle size is reduced to improve transparency, then transparency is improved, but dispersion stability deteriorates
Solution Approach 1:
The patent optimizes the particle size parameter to a specific range (0.1 μm to 10 μm) and controls the aggregation state to achieve the desired balance. By carefully adjusting these parameters, the patent ensures that pigment particles are small enough for transparency yet aggregated sufficiently for dispersion stability, resolving the contradiction between transparency and dispersion stability
4Reliability
If molecular weight is increased to improve light fastness, then light fastness is improved, but dispersibility deteriorates
Solution Approach 1:
The patent modifies the molecular weight parameter of azo pigments through specific structural substitutions (adding electron-withdrawing groups) while controlling the increase to maintain dispersibility. The molecular weight is increased sufficiently to improve light fastness but not excessively to preserve good dispersibility, resolving the contradiction between these two properties
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 azo pigment composition exhibits excellent light fastness, chemical stability, and high tinctorial strength, ensuring long-term color reproducibility and resistance to environmental factors, making it suitable for inkjet recording and other applications.
Implementation Method 1
colorants (dyes or pigments) of three primary colors of a so-called additive color mixing process or subtractive color mixing process have been used in order to display or record full-color images
Implementation Method 2
the pigment is further required to be substantially insoluble in water or in an organic solvent, to have a good fastness to chemicals, and not to lose the preferred absorption characteristics it shows in a molecularly dispersed state even when used as particles
Data Source
AI summary
To provide an azo pigment composition having extremely good hue and extremely good light fastness and showing excellent tinctorial strength (color density) and, preferably, to provide an azo pigment composition further containing an azo pigment having characteristic X-ray diffraction peaks at different positions or a tautomer thereof An azo pigment composition which contains at least one azo pigment represented by the following formula (1) and having characteristic peaks at Bragg angles (20±0.2°) of 7.2° and 25.9° in X-ray diffraction with the characteristic Cu Kα line, or a tautomer thereof:.