Ink jet composition and ink jet recording method
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Solution Overview
Problem
Existing ink jet inks face challenges in achieving both ejection stability and color development property simultaneously, particularly when using water-based inks or ink jets containing resin materials like polyester.
Innovation Solution
An ink jet composition comprising water, a polyester resin with sulfo groups, and a colorant, where the colorant is contained in particles with an average diameter of 100 nm or less, and a content rate of 15 percent by mass or more, ensuring excellent hydrophilic and dispersion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the solid content concentration is increased to improve the color development property, then the color development property is improved, but the ejection stability by an ink jet method is degraded
Solution Approach 1:
The colorant is divided into ultrafine particles with an average particle diameter of 100 nm or less, which are then dispersed in the ink jet composition. This segmentation allows the colorant to be distributed uniformly throughout the ink without increasing overall viscosity, thereby maintaining ejection stability while improving color development property through increased surface area and light absorption.
Solution Approach 2:
The particle size of the colorant is changed to an ultrafine scale (100 nm or less), which fundamentally alters its interaction with the ink medium. This parameter change enables the colorant to achieve high color development without proportionally increasing viscosity, thus resolving the contradiction between color strength and ejection stability.
2Ease of operation
If a water-based ink is used to improve handleability and safety, then handleability and safety are improved, but a sufficiently excellent coating film strength is difficult to obtain
Solution Approach 1:
The ink jet composition uses a composite system where ultrafine colorant particles are dispersed in a water-based ink medium containing polyester resin. This composite structure allows the water-based ink to provide good handleability and safety, while the ultrafine particles and resin components work together to form a coating film with sufficient strength through enhanced interfacial adhesion and uniform distribution.
Data Source
AI summary
An ink jet composition of the present disclosure includes water; a polyester resin having sulfo groups; and a colorant, the colorant is contained in particles formed from a material containing the polyester resin, and the particles have an average particle diameter of 100 nm or less and are contained in the ink jet composition at a content rate of 15 percent by mass or more.