Ink Composition Adhesion Stability TRIZ Case
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Solution Overview
Problem
Wide format ink jet printers require ink compositions with excellent adhesion to non-permeable substrates like polyvinyl chloride, resistance to cracking and peeling, and long-term storage stability, while maintaining viscosity and particle size consistency, which existing ink compositions fail to achieve effectively.
Innovation Solution
An ink composition containing carbon black, a basic polymeric dispersing agent, and N-vinyl caprolactam, with specific pH and amine value ranges for the carbon black and dispersing agent, along with a phthalocyanine sulfonic acid ammonium salt, to enhance storage stability and adhesion, and an aluminum deposited plastic pouch for storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional ink compositions are used for wide format printing, then adhesion to non-permeable substrates is improved, but storage stability deteriorates due to viscosity and particle size changes over time
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pH value (2.0-7.0) and amine value (25-50 mg KOH/g) of the basic polymeric dispersing agent,以及 the particle size distribution (D10-D90 ratio of 1.2-3.0) of the pigment. These controlled parameter changes stabilize the ink composition during storage while maintaining adhesion performance.
Solution Approach 2:
The patent uses a composite dispersing system combining a basic polymeric dispersing agent with a phthalocyanine sulfonic acid ammonium salt. This composite approach provides both adhesion promotion and storage stability, as the synergistic combination prevents pigment aggregation and maintains viscosity consistency over time.
2Area of stationary object
If the printing time for wide format is extended, then coverage area is improved, but ejection reliability deteriorates due to viscosity changes
Solution Approach 1:
Instead of trying to reduce printing time to improve reliability, the patent inverts the approach by stabilizing the ink composition itself through controlled pH and dispersing agent parameters. This allows long printing times to be maintained without viscosity changes that would compromise ejection reliability.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining consistent ink composition properties throughout extended printing periods. The controlled pH and dispersing agent system prevents viscosity drift and particle aggregation, allowing continuous ejection operation without reliability degradation.
3Strength
If pigment particle size is reduced for better dispersion, then adhesion is improved, but filtration properties worsen due to increased sensitivity to aggregation
Solution Approach 1:
The patent applies parameter changes by controlling the particle size distribution (D10-D90 ratio of 1.2-3.0) and pH value (2.0-7.0) to optimize both adhesion and filtration. This precise parameter control ensures fine particles remain dispersed without causing filtration issues.
Solution Approach 2:
The phthalocyanine sulfonic acid ammonium salt acts as an intermediary substance that bridges the conflict between fine particle dispersion and filtration stability. It prevents aggregation of small particles while maintaining good flow and filtration 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 ink composition exhibits improved storage stability, adhesion, and filtration properties, maintaining viscosity and particle size consistency, suitable for wide format printing applications.
Implementation Method 1
a basic polymeric dispersing agent with a specific amine value range (25-50 mg KOH/g) is used to stabilize carbon black particles
Implementation Method 2
N-vinyl caprolactam is contained in an amount of 15 mass% or more of the entire ink composition to provide adhesion
Implementation Method 3
a phthalocyanine sulfonic acid ammonium salt is added to enhance storage stability and adhesion
Data Source
AI summary
Providing is an ink composition for ink jet recording comprising a pigment, a pigment dispersing agent, a polymerizable compound, and a phthalocyanine sulfonic acid ammonium salt, wherein carbon black is contained as the pigment, a basic polymeric dispersing agent is contained as the pigment dispersing agent, N-vinyl caprolactam is contained as the polymerizable compound in an amount of 15 mass% or more of the entire ink composition, and the following (i) or (ii) is satisfied: (i) The pH of the carbon black is 2.0 or more to 3.5 or less, and the amine value of the basic polymeric dispersing agent is 25 mg KOH/g or more to less than 40 mg KOH/g; (ii) The pH of the carbon black is 2.0 or more to 7.0 or less, and the amine value of the basic polymeric dispersing agent is 40 mg KOH/g or more to 50 mg KOH/g or less.