Pigment Ink with Modified Siloxane for Scratch Resistance
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Solution Overview
Problem
Conventional pigment inks for inkjet recording lack sufficient scratch resistance, particularly when images are subjected to strong pressure or outdoor conditions, as existing methods fail to provide a high enough level of protection against scratching and material scraping.
Innovation Solution
A pigment ink formulation incorporating a modified siloxane compound and a specific polymer with controlled acid value and hydrogen bond parameter, which enhances the surface slipperiness of images, thereby improving scratch resistance by maintaining the polymer and siloxane compound on the surface of the recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pigment inks are used for inkjet recording, then basic image formation is achieved, but scratch resistance is insufficient and coloring materials are scraped off when images are touched by edged objects
Solution Approach 1:
The patent uses a composite ink formulation containing both a polymer (acrylic or vinyl-based) and a modified siloxane compound. The polymer provides film formation and adhesion, while the siloxane compound (with specific molecular weight 8,000-50,000 and specific chemical structure containing Si-O-Si bonds and organic groups) provides surface slipperiness and scratch resistance. This composite approach creates synergistic effects that achieve high-level scratch resistance unattainable with single components.
Solution Approach 2:
The patent specifies precise parameter ranges for the modified siloxane compound: molecular weight of 8,000-50,000, specific chemical structure with Si-O-Si bonds, and controlled content (0.1-5% by mass). The polymer acid value is controlled at 90-200 mgKOH/g. These parameter optimizations ensure the ink forms images with coefficient of dynamic friction of 0.40 or less, achieving the target scratch resistance level.
2Reliability
If lubricating substances are applied onto images to improve scratch resistance, then slipperiness is enhanced, but the substances penetrate into the recording medium and the scratch resistance effect is lost
Solution Approach 1:
The patent employs a polymer-based film formation mechanism where the polymer (acrylic or vinyl-based with specific acid value) creates a continuous film on the recording medium surface. This film acts as a flexible protective layer that retains the modified siloxane compound on the surface, preventing penetration into the recording medium while maintaining the slipperiness and scratch resistance effects.
Solution Approach 2:
The polymer acts as an intermediary between the modified siloxane compound and the recording medium. It holds the siloxane compound on the surface through film formation and adhesion, preventing direct contact and penetration into the recording medium. This intermediary mechanism allows the siloxane to provide scratch resistance without being absorbed by the substrate.
3Reliability
If images are covered with a laminate film to provide scratch resistance, then protection is achieved, but the system complexity and cost increase due to additional equipment
Solution Approach 1:
The patent combines the scratch resistance function directly into the inkjet recording ink itself, merging the protective function with the imaging function. The modified siloxane compound and polymer in the ink formulation provide scratch resistance as an intrinsic property of the formed image, eliminating the need for separate laminating equipment or post-treatment processes.
Solution Approach 2:
The inkjet ink performs self-protection by containing components (polymer and modified siloxane) that automatically form a scratch-resistant layer during the normal recording process. No additional services, equipment, or post-treatment steps are required - the ink itself provides the protective function through its formulation and the natural film formation process upon drying.
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 achieves a significantly higher level of scratch resistance, where images remain intact even under strong pressure and outdoor conditions, with a coefficient of dynamic friction of 0.40 or less, effectively preventing material scraping and maintaining image integrity.
Implementation Method 1
the images are made slippery by virtue of the pigment ink... the scratch resistance of the images can strikingly be improved... coefficient of dynamic friction of 0.40 or less
Implementation Method 2
maintaining the polymer and siloxane compound on the surface of the recording medium
Data Source
AI summary
A pigment ink is provided which has good ink reliability and storage stability and can achieve superior scratch resistance of images at such a level that coloring materials are hardly scraped off even when images are scratched with finger nails under application of such strong pressure as to scratch a recording medium at its non-recorded areas. The pigment ink contains a pigment, a modified siloxane compound having a specific structure, and a polymer whose acid value and hydrogen bond parameter (δh) are specified.