Ink Composition with Core-Shell Particles for Light Resistance
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Solution Overview
Problem
Inkjet recording technologies face challenges in achieving high-quality, water-resistant, and light-resistant prints, particularly with pigments like Pigment Yellow 74, which has lower light-resistance properties, making outdoor use unsuitable and requiring improved formulations for inkjet inks.
Innovation Solution
An ink composition comprising a dispersion medium with water and glycol ether, a pigment such as Pigment Yellow 155, and core-shell particles with hydrophobic acrylic resin cores and aqueous urethane resin shells, along with additives like wetting agents and dispersants, to enhance viscosity, adhesion, and stability, ensuring suitable ejection from nozzle heads and improved light-resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pigment-based coloring agents are used to improve water-resistance and light-resistance, then durability is improved, but light-resistance property deteriorates with certain pigments like Pigment Yellow 74
Solution Approach 1:
The patent changes the chemical composition parameters of the ink formulation by introducing specific compounds (carboxylic acid and its ester with specific carbon chain lengths, and sulfur compounds) to improve the light-resistance of pigment-based inks while maintaining water-resistance properties
Solution Approach 2:
The patent creates a composite ink formulation combining pigment particles with specific organic additives (carboxylic acid esters and sulfur compounds) to achieve both water-resistance and improved light-resistance, overcoming the limitations of pure pigment-based inks
2Manufacturing precision
If high pigment concentration is used to increase image density, then color intensity is improved, but storage stability deteriorates
Solution Approach 1:
The patent introduces carboxylic acid esters and sulfur compounds as intermediary substances that mediate between pigment particles and the ink vehicle, preventing pigment aggregation and improving storage stability while maintaining high image density
3Strength
If viscosity is increased to improve adhesion and scratch resistance, then durability is improved, but ejection performance deteriorates
Solution Approach 1:
The patent optimizes the viscosity parameter by selecting specific carboxylic acid esters with controlled molecular weights and chain lengths, achieving a balance between adhesion strength and ejection performance through precise parameter control
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 high image density, enhanced scratch resistance, and improved storage stability, allowing for reliable outdoor use on various surfaces without ink drying issues, reducing maintenance burdens and ensuring stable ink ejection.
Implementation Method 1
a core consisting of hydrophobic acrylic resin
Implementation Method 2
glycol ether of which boiling point is equal to or greater than 220 degrees centigrade
Data Source
AI summary
According to an embodiment, an ink composition for inkjet recording comprises a dispersion medium that contains water and glycol ether of which boiling point is equal to or greater than 220 degrees centigrade, a pigment and a core-shell particle that includes a core consisting of hydrophobic acrylic resin and a shell consisting of at least one of aqueous urethane resin and acrylic graft aqueous urethane resin.