Ink Composition Dual-Wax System Abrasion Resistance
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Solution Overview
Problem
Ink compositions for inkjet recording on non-ink-absorbing or low-ink-absorbing media face issues with abrasion resistance and discharge stability due to wax aggregation in nozzles, and high-temperature drying weakens the ink film, reducing abrasion resistance.
Innovation Solution
An ink composition combining high-melting-point first wax particles and low-melting-point second wax particles with a resin emulsion having a specific glass transition point range, along with an aprotic polar solvent, to enhance abrasion resistance and prevent nozzle clogging, while maintaining stability during high-temperature recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wax particles with high melting point are used to increase abrasion resistance, then abrasion resistance is improved, but wax particles aggregate and clog nozzles, deteriorating discharge stability
Solution Approach 1:
The wax component is segmented into two distinct types: first wax particles (melting point 120-170°C) for abrasion resistance and second wax particles (melting point 70-120°C) for discharge stability. This segmentation allows each wax type to perform its specific function without the drawbacks of using only high-melting-point wax.
Solution Approach 2:
The ink composition uses a composite wax system combining two different wax particle types with complementary properties. The first wax particles provide the hard, abrasion-resistant film, while the second wax particles ensure smooth nozzle discharge by preventing aggregation, creating a synergistic effect.
2Productivity
If drying temperature is increased to shorten drying time and increase productivity, then productivity is improved, but ink film strength is reduced, deteriorating abrasion resistance
Solution Approach 1:
The invention changes the chemical composition parameters of the ink, specifically the wax particle melting points and resin emulsion Tg, to enable the ink film to withstand high-temperature drying without weakening. This allows rapid drying at high temperatures while maintaining film strength.
3Reliability
If ink composition is used for non-ink-absorbing or low-ink-absorbing recording media, then recording stability is improved, but abrasion resistance of recorded matter deteriorates
Solution Approach 1:
The composite wax system combined with high-Tg resin emulsion creates a cohesive ink film structure that adheres well to non-ink-absorbing media while providing sufficient abrasion resistance. The second wax particles ensure proper film formation and adhesion, while the first wax particles provide the necessary surface hardness.
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 achieves excellent abrasion resistance and recording stability on non-ink-absorbing media, even under high-temperature conditions, by preventing wax aggregation and ensuring stable discharge, thus maintaining film strength and preventing nozzle clogging.
Implementation Method 1
The resin emulsion has a glass transition point (Tg) of 50°C or higher and 150°C or lower
Implementation Method 2
The first wax particles have a melting point of 120°C or higher and 170°C or lower. The second wax particles have a melting point of 70°C or higher and less than 120°C
Data Source
AI summary
An ink composition contains a pigment, first wax particles, second wax particles, and a resin emulsion, in which the first wax particles have a melting point of 120° C. or higher and 170° C. or lower, the second wax particles have a melting point of 70° C. or higher and less than 120° C., the resin emulsion has a glass transition point of 50° C. or higher and 150° C. or lower, the first wax particles contain one or more kinds of wax particles selected from the group consisting of polyethylene wax particles or polypropylene wax particles, and the second wax particles contain one or more kinds of wax particles selected from the group consisting of polyethylene wax particles.