Ink Formulation Using Anionic Urethane Resin and Organic Amine
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Solution Overview
Problem
Inkjet inks used for recording images on glossy paper suffer from poor water resistance, light resistance, and rub resistance due to the permeation of pigments into the paper, leading to image peeling and fouling when rubbed, while the inclusion of resins in inks causes nozzle clogging and viscosity issues.
Innovation Solution
An ink formulation incorporating anionic urethane resin particles and an organic amine compound with specific boiling and molecular weight ranges, combined with a fluorine-based surfactant and foam inhibitor, to enhance rub resistance, discharge stability, and maintainability, allowing for stable ink viscosity and improved image quality on both plain and glossy papers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pigment ink is used on glossy paper, then water resistance and light resistance are improved, but rub resistance deteriorates due to image peeling
Solution Approach 1:
The patent introduces a specific resin component as an intermediary substance between the pigment and the glossy paper. This resin acts as a binding agent that anchors the pigment particles to the paper surface, preventing peeling while maintaining the water and light resistance properties of the pigment ink.
Solution Approach 2:
The invention creates a composite ink formulation combining pigment particles with specific resin components. This composite material approach allows the ink to simultaneously achieve water resistance and light resistance from the pigment while gaining rub resistance from the resin binder that holds the pigment firmly on the glossy paper surface.
2Strength
If resin is included in ink to improve rub resistance, then image peeling is reduced, but nozzle clogging and viscosity issues occur
Solution Approach 1:
The patent carefully controls the molecular weight parameters of the resin components, specifying a range of 1,000 to 10,000. This parameter optimization ensures the resin provides sufficient rub resistance while maintaining appropriate ink viscosity and flow characteristics to prevent nozzle clogging during inkjet deposition.
Solution Approach 2:
The invention applies resin components with specific properties (molecular weight 1,000-10,000) locally optimized for inkjet application. The resin formulation is tailored to provide rub resistance at the image level while maintaining overall ink fluidity for proper nozzle operation, achieving different quality requirements in different aspects of the ink system.
3Ease of operation
If water-soluble dye ink is used, then ease of operation and safety are improved, but water resistance and light resistance deteriorate
Solution Approach 1:
The patent merges the advantages of water-soluble dyes (ease of operation, safety, environmental friendliness) with the advantages of pigment inks (water resistance, light resistance) by using water-dispersible pigment particles. This combination allows the ink to be applied easily like dye inks while achieving the durability of pigment inks on glossy paper.
Solution Approach 2:
The invention changes the fundamental parameter of colorant type from water-soluble dye to water-dispersible pigment, while optimizing particle size and resin content to maintain ease of operation. This parameter change enables the ink to retain the safety and ease of use of water-based systems while achieving water and light resistance through the pigment formulation.
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 provides improved rub resistance, discharge stability, and maintainability, preventing image peeling and nozzle clogging, while maintaining high image quality on various paper types by stabilizing the resin particles and suppressing viscosity increases.
Implementation Method 1
an inkjet ink which includes a resin particle including an anionic urethane resin, and an organic amine compound
Implementation Method 2
applying at least one stimulus selected from heat, pressure, and vibration to the ink to fly the ink
Data Source
AI summary
An ink is provided. The ink includes a colorant, an organic solvent, a resin particle including an anionic urethane resin, and an organic amine compound having a boiling point in the range of from 120° C. to 200° C. and a molecular weight of 100 or less, and water, and the mass ratio of the organic amine compound to the resin particle is in the range of from 0.01 to 1.00.