Non-aqueous Ink Composition with High-Viscosity Resin Control
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Solution Overview
Problem
Existing non-aqueous ink compositions face challenges in achieving continuous ejection stability and storage stability while maintaining good coloring properties and durability in printed matter.
Innovation Solution
A non-aqueous ink composition is developed with a controlled content of resin having an intrinsic viscosity of 90 mL/g or more, specifically limiting it to 5% by mass or less, and using a combination of acrylic-based, vinyl chloride-vinyl acetate copolymer, and cellulose-based resins, along with a polymeric dispersing agent, and solvents like glycol ether-based, amide-based, and lactone-based solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If resin content is increased to improve coloring property and durability, then coloring property and durability are improved, but continuous ejection stability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the intrinsic viscosity of the resin to be 90 mL/g or more and its content to be 5% by mass or less of the total resin amount. This specific parameter range resolves the contradiction by enabling sufficient coloring property and durability while maintaining continuous ejection stability through optimized viscosity control.
Solution Approach 2:
The patent uses composite materials by combining multiple resin types (acrylic-based resin, vinyl chloride-vinyl acetate copolymer resin, and cellulose-based resin) in specific proportions. This composite approach allows the ink composition to achieve both good coloring property/durability and continuous ejection stability through synergistic effects of different resin components.
2Strength
If resin with high intrinsic viscosity is used to improve coloring property, then coloring property is improved, but storage stability deteriorates
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges: intrinsic viscosity of 90 mL/g or more for coloring property, while limiting the content of such high-viscosity resin to 5% by mass or less of the total resin. This balanced parameter control maintains storage stability while achieving good coloring property.
3Strength
If resin content is increased to improve durability, then durability is improved, but printing performance deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the resin content to be 3.0% by mass or more and 13.0% by mass or less of the total ink composition, with high-intrinsic-viscosity resin (90 mL/g or more) limited to 5% by mass or less of total resin. This optimized parameter range achieves good durability while maintaining excellent printing performance including continuous ejection stability.
Data Source
AI summary
A non-aqueous ink composition which has superior printing performance, such as continuous discharge stability, and also has excellent storage stability and excellent coloring properties, and with which printed matter having superior durability can be obtained. A non-aqueous ink composition discharged using an inkjet method, the composition containing an organic solvent, a colorant, and a resin, where the resin contains at least one resin selected from the group consisting of acrylic resins, vinyl chloride-vinyl acetate copolymer resins, and cellulose resins, and a resin having intrinsic viscosity at 25° C. of 90 mL/g or more accounts for up to 5 mass % of the entire resin.