Solvent-Based Ink Composition for Low-Temperature Jetting Stability
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Solution Overview
Problem
Existing non-aqueous inkjet inks face challenges in maintaining inkjet discharge stability and long-term stability while ensuring low-temperature fluidity, particularly due to the use of hydrocarbon-based solvents which are hazardous and restricted in some regions, and fatty acid ester-based solvents with high viscosity and poor low-temperature fluidity.
Innovation Solution
An ink composition comprising a saturated fatty acid diester-based solvent and an unsaturated fatty acid monoester-based solvent, with a specific mass ratio, to ensure low-temperature fluidity and stability without hydrocarbon-based solvents, combined with a dispersant and optional additives for improved dispersibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fatty acid ester-based solvent is used to improve stability and pigment dispersibility, then stability and dispersibility are improved, but viscosity increases and low-temperature fluidity deteriorates
Solution Approach 1:
The patent combines two types of solvents: a fatty acid ester-based solvent (providing stability and dispersibility) and a hydrocarbon-based solvent (providing low-temperature fluidity). This merging allows the ink composition to achieve both improved stability and maintained low-temperature fluidity, resolving the contradiction between these two properties.
2Temperature
If a hydrocarbon-based solvent is used to ensure low-temperature fluidity, then low-temperature fluidity is improved, but hazardous effects increase and usage is restricted
Solution Approach 1:
The patent changes the chemical composition parameters by using a specific combination of fatty acid ester-based solvent and hydrocarbon-based solvent in controlled proportions. This parameter change allows achieving the desired low-temperature fluidity while minimizing hazardous effects through optimized formulation.
3Reliability
If a non-volatile solvent is used to prevent nozzle clogging, then reliability is improved, but drying speed decreases
Solution Approach 1:
The patent merges a non-volatile solvent (fatty acid ester-based) with a volatile hydrocarbon-based solvent. The non-volatile component prevents nozzle clogging and ensures reliability, while the volatile component provides sufficient drying speed by evaporating quickly during the printing process.
Data Source
AI summary
Provided is an ink composition for solvent-based inkjet printing, including a colorant, a dispersant, and a solvent, in which the colorant includes a pigment and/or a dye, the solvent includes a saturated fatty acid diester-based solvent and an unsaturated fatty acid monoester-based solvent, a total amount of the saturated fatty acid diester-based solvent and the unsaturated fatty acid monoester-based solvent is 50% by mass or greater with respect to a total amount of the ink composition for solvent-based inkjet printing, and a mass ratio of the saturated fatty acid diester-based solvent to the unsaturated fatty acid monoester-based solvent is 2:8 to 8:2.