Quinacridone Inkjet Ink Resin Dispersion for Stable Ejection
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Solution Overview
Problem
Inkjet inks containing quinacridone pigments face issues with ejection stability due to the electrostatic adherence of phosphorous-containing catalysts and sulfur compounds to recording head surfaces, leading to skewed ejection and reduced dispersibility, while also affecting re-solubility and scratch resistance of printed images.
Innovation Solution
The ink formulation includes a pigment dispersion resin with a specific ratio of adsorption and non-adsorption resins, along with controlled concentrations of phosphorous and sulfur, to maintain optimal dispersibility and prevent nozzle clogging, ensuring stable ejection and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quinacridone pigment is used in inkjet ink, then color quality is improved, but ejection stability deteriorates due to electrostatic adherence of phosphorous-containing catalysts and sulfur compounds to recording head surfaces
Solution Approach 1:
A pigment dispersion resin is introduced as an intermediary substance between the quinacridone pigment and the recording head surface. The resin forms a stable dispersion that prevents direct electrostatic adherence of phosphorous-containing catalysts and sulfur compounds to the recording head, thereby maintaining ejection stability while preserving the color quality provided by the quinacridone pigment.
Solution Approach 2:
The invention controls the concentrations of phosphorous and sulfur compounds within specific ranges (phosphorous: 1.0-6.0 ppm, sulfur: 1.0-6.0 ppm) to optimize the balance between color quality and ejection stability. By adjusting these parameters, the negative electrostatic effects are minimized while maintaining the desired pigment performance.
2Stability of the object's composition
If phosphorous-containing catalysts and sulfur compounds are present in inkjet ink, then pigment dispersibility is improved, but skewed ejection occurs due to electrostatic adherence to recording head surfaces
Solution Approach 1:
The invention optimizes the concentration parameters of phosphorous-containing catalysts (1.0-6.0 ppm) and sulfur compounds (1.0-6.0 ppm) to achieve the desired pigment dispersibility while minimizing electrostatic adherence effects that cause skewed ejection. This parameter optimization allows simultaneous achievement of good dispersibility and ejection accuracy.
Solution Approach 2:
The pigment dispersion resin acts as a mediator that maintains pigment dispersibility through controlled chemical interactions while preventing excessive electrostatic adherence to the recording head surface, thereby eliminating skewed ejection without sacrificing pigment dispersion quality.
3Stability of the object's composition
If phosphorous-containing catalysts and sulfur compounds are present in inkjet ink, then pigment dispersibility is improved, but re-solubility and scratch resistance of printed images deteriorate
Solution Approach 1:
The invention controls the concentrations of phosphorous-containing catalysts (1.0-6.0 ppm) and sulfur compounds (1.0-6.0 ppm) within optimal ranges that maintain adequate pigment dispersibility while preventing excessive accumulation that would compromise re-solubility and scratch resistance of the printed images.
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 solution inhibits skewed ink ejection, enhances re-solubility, and improves scratch resistance of printed images by maintaining controlled concentrations of phosphorous and sulfur impurities, thereby stabilizing ink ejection and optimizing image quality.
Implementation Method 1
a pigment dispersion resin including an adsorption resin adsorbed to the quinacridone pigment and a non-adsorption resin not adsorbed to the quinacridone pigment
Data Source
AI summary
An inkjet ink contains a quinacridone pigment, a pigment dispersion resin, and an aqueous medium. The pigment dispersion resin includes an adsorption resin adsorbed to the quinacridone pigment and a non-adsorption resin not adsorbed to the quinacridone pigment. The non-adsorption resin has a percentage content in the pigment dispersion resin of at least 20% by mass and no greater than 50% by mass. A supernatant obtained by centrifugation of the inkjet ink at 1,050,000 G for 3 hours has a phosphorous concentration of at least 1.0 ppm and no greater than 6.0 ppm. The supernatant has a sulfur concentration of at least 1.0 ppm and no greater than 6.0 ppm.