Ink Composition Polyolefin Wax Urethane Resistant Scratch
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Solution Overview
Problem
Aqueous inkjet recording compositions with pigments face challenges in achieving sufficient scratch resistance and rub resistance immediately after printing, while maintaining high gloss and print density, due to the limitations of existing binder resins and waxes in stabilizing the ink film on recording media.
Innovation Solution
The composition incorporates a polyolefin wax and a water-dispersible urethane resin, where the urethane resin acts as a binder to smooth the surface irregularities caused by the polyolefin wax, enhancing scratch and rub resistance while maintaining high gloss by ensuring the wax is tightly bonded to the recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyolefin wax is added to improve scratch resistance and rub resistance, then the rub resistance is improved, but the gloss of the image is reduced
Solution Approach 1:
A carboxyl group-containing polymer is introduced as an intermediary substance that mediates between the polyolefin wax and the recording medium. This polymer has affinity for both the wax and the recording medium, forming a bridge that allows the wax to be tightly bonded to the medium while preventing surface irregularities that would reduce gloss. The polymer acts as a dispersant and binder, enabling the wax to provide rub resistance without compromising the smooth surface needed for high gloss.
2Illumination intensity
If a binder resin is added to improve print density and gloss, then the gloss is improved, but the scratch resistance immediately after printing is insufficient
Solution Approach 1:
The invention uses a composite system combining a carboxyl group-containing polymer with a polyolefin wax. This composite material leverages the binding properties of the polymer and the protective, smooth surface properties of the wax to achieve both high gloss and improved scratch resistance immediately after printing. The combination creates a synergistic effect where the polymer provides adhesion and the wax provides surface smoothness and scratch resistance.
3Productivity
If the drying rate of the ink film is increased to improve fixation, then the fixation is improved, but the wax is detached before completely fixed causing significant reduction in image quality
Solution Approach 1:
The carboxyl group-containing polymer serves as a mediator that maintains the wax in place during the drying process. The polymer's affinity for both the wax and the recording medium creates a stable interface that prevents wax detachment even when the drying rate is increased. This allows the ink film to dry quickly for improved productivity while the polymer ensures the wax remains firmly bonded, preventing image quality degradation.
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 combination of polyolefin wax and water-dispersible urethane resin provides improved scratch resistance and rub resistance immediately after printing, while maintaining high gloss and print density, suitable for various recording media and high-speed printing applications.
Implementation Method 1
the polyolefin wax (f) is present on a colored film formed by the deposition of the ink composition on a recording medium
Implementation Method 2
the urethane resin serving as a binder resin covers the irregularities on the surface of the recording medium to smooth the irregularities
Implementation Method 3
the urethane resin serving as a binder resin covers the irregularities on the surface of the recording medium to smooth the irregularities, thus enabling improvement in gloss while maintaining high scratch resistance and rub resistance
Data Source
AI summary
It is an object of the present invention to provide an aqueous ink composition for inkjet recording, the aqueous ink composition having satisfactory dispersion properties and ejection properties, excellent scratch resistance and rub resistance, and high color developability and gloss. To this end, the present invention provides an aqueous ink composition for inkjet recording, the aqueous ink composition containing a pigment (a), an anionic group-containing resin (b), a humectant (c), a basic compound (d), a water-dispersible polyurethane resin (e), and a polyolefin wax (f). The water-dispersible polyurethane resin content is preferably in the range of 0.2% to 5% by mass. The value of (Cf·Df) is preferably in the range of 3 to 100, wherein Cf represents the polyolefin wax (f) content (percent by mass), and Df represents the volume-average particle size (nm).