White Ink Composition Resolving Stickiness and Bleeding
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Solution Overview
Problem
White ink compositions used in ink jet printing often result in sticky image surfaces, leading to adhesion issues when images are stacked, and suffer from bleeding with color inks, compromising the quality and durability of the printed images.
Innovation Solution
A white ink composition containing a specific ratio of styrene acrylic resin to urethane resin, along with metal compound pigments and hollow resin particles, which inhibits stickiness and bleeding while maintaining excellent whiteness and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a urethane resin is used as a fixing resin component, then abrasion resistance is improved, but the image surface becomes sticky causing adhesion between stacked images
Solution Approach 1:
The patent changes the chemical composition parameters of the fixing resin by incorporating styrene acrylic resin in combination with urethane resin. This parameter change modifies the surface properties of the dried image to reduce stickiness while preserving the abrasion resistance provided by the urethane resin component.
Solution Approach 2:
The patent uses a composite fixing resin system combining styrene acrylic resin and urethane resin. This composite material approach allows the formulation to achieve multiple properties simultaneously: the urethane resin provides abrasion resistance while the styrene acrylic resin contributes to reduced surface stickiness, resolving the contradiction between these two properties.
2Adaptability or versatility
If color inks are applied onto a white image layer, then color images can be formed, but the color inks tend to bleed compromising image quality
Solution Approach 1:
The patent modifies the chemical composition parameters of the white ink formulation by incorporating specific ratios of styrene acrylic resin and urethane resin. This creates a base layer with optimized surface properties that provide better anchoring and barrier characteristics, preventing color ink bleed-through while maintaining color image formation capability.
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 composition achieves high-quality images with excellent whiteness, abrasion resistance, and inhibited bleeding with color inks, while preventing stickiness on the image surface, enhancing the reliability and performance of ink jet recording systems.
Implementation Method 1
the hollow resin particles can exhibit a light-shielding effect due to light scattering caused by a difference in refractive index between the envelope and the cavity of the particle
Data Source
AI summary
A white ink composition contains a white coloring material and a fixing resin component. The fixing resin component includes a styrene acrylic resin and a urethane resin at a mass ratio of the styrene acrylic resin to the urethane resin (styrene acrylic resin/urethane resin) of at least 1/10.