Ink Set Resin Particle Acid Value Optimization
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Solution Overview
Problem
Ink jet recording methods using self-dispersible carbon black pigments experience irregular ejection issues due to continuous use and contact between inks, leading to poor image quality and clogging of recording heads.
Innovation Solution
An ink set comprising a first ink with self-dispersible carbon black and a resin particle, and a second ink with a resin, where the mass ratio and acid values of the particles are optimized to reduce irregular ejection by forming a stable complex that adheres weakly to the ejection orifice surface, preventing wear and uneven wetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ink containing self-dispersible carbon black and resin particle is used for continuous recording, then the abrasion resistance and head clogging prevention are improved, but irregular ejection occurs due to wear and uneven wetting of the ejection orifice surface
Solution Approach 1:
The patent changes the chemical parameters of the resin particle by controlling its acid value within a specific range (40-200 mg KOH/g) and adjusting the mass ratio of carbon black to resin particle (1:0.1 to 1:0.5). These parameter optimizations modify the interaction between the resin particle and the ejection orifice surface, reducing wear and preventing irregular ejection while maintaining abrasion resistance.
Solution Approach 2:
The patent creates a composite system by combining self-dispersible carbon black pigment with specifically formulated resin particles having controlled acid values. This composite ink formulation achieves both improved abrasion resistance through the resin particle protection and reduced irregular ejection by optimizing the chemical composition and interaction properties of the composite materials.
2Reliability
If resin particle is added to self-dispersible carbon black ink to improve abrasion resistance, then the ink becomes less likely to clog the recording head, but irregular ejection occurs due to contact between inks
Solution Approach 1:
The patent optimizes the acid value parameter of the resin particle (40-200 mg KOH/g) and the concentration ratio of carbon black to resin particle (1:0.1 to 1:0.5). These parameter changes control the surface chemistry and interaction properties, preventing irregular ejection during ink contact while maintaining the head clogging prevention benefits of resin particle addition.
3Illumination intensity
If carbon black pigment is used for high color saturation and masking properties, then the image quality is improved, but irregular ejection occurs due to continuous use causing deflection of ejection direction
Solution Approach 1:
The patent introduces resin particle as an intermediary substance between the carbon black pigment and the ejection orifice surface. The resin particle acts as a mediator that protects the orifice surface from direct contact and wear by the abrasive carbon black, preventing irregular ejection while allowing the carbon black to maintain its high color saturation and masking properties in the recorded image.
Solution Approach 2:
The patent optimizes the mass ratio of carbon black to resin particle (1:0.1 to 1:0.5) to achieve the right balance between maintaining color saturation from the carbon black and preventing irregular ejection through the protective resin particle. This parameter optimization ensures sufficient carbon black concentration for image quality while limiting its direct contact with the ejection surface.
Data Source
Figure 1A~1C
Figure 2
AI summary
An ink set for ink jet includes a combination of a first ink and a second ink. The first ink contains a self-dispersible type carbon black and a specified particle A. The content of the particle A in the first ink is 0.05% by mass or more and 0.50% by mass or less, and the mass ratio of the content of the particle A to that of the self-dispersible pigment in the first ink is 0.056 times or more and 0.250 times or less. The second ink contains a specified particle B. The acid value a of the particle A and the acid value b of the particle B satisfy the relation of a ≤ b.