Surface Modified Carbon Black for Aqueous Inkjet Inks
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Solution Overview
Problem
There is a need for additional methods to modify the surface chemistry of carbon black to impart increased hydrophilicity and self-water dispersibility for use in aqueous inks, as existing technologies do not adequately address these properties.
Innovation Solution
A process involving the reaction of carbon black with a conjugated diimine compound to attach conjugated diamine groups, which can include carboxylic or sulfonic acid groups, enhancing hydrophilicity and self-dispersibility, is employed to create surface-modified carbon black products for use in inkjet ink compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface modification methods (oxidation, sulfonation, halogenation) are used to modify carbon black surface, then some surface properties are changed, but the carbon black does not achieve adequate hydrophilicity and self-water dispersibility for aqueous ink applications
Solution Approach 1:
The patent changes the chemical parameters of the carbon black surface by introducing conjugated diamine groups through reaction with conjugated diimine compounds. This chemical modification fundamentally alters the surface properties to achieve both hydrophilicity and self-dispersibility simultaneously, resolving the contradiction between achieving adequate wettability and maintaining process simplicity.
Solution Approach 2:
The patent creates a composite structure by attaching conjugated diamine groups to the carbon black surface, forming a surface-modified carbon black product. This composite approach combines the properties of carbon black with the hydrophilic and dispersible characteristics of the conjugated diamine groups, achieving the desired performance in aqueous ink applications.
2Reliability
If additional surface modification steps are implemented to improve hydrophilicity, then water dispersibility improves, but the manufacturing process becomes more complex and costly
Solution Approach 1:
The conjugated diamine groups are attached to the carbon black surface in advance during the manufacturing process, performing the surface modification action before the carbon black is used in aqueous ink formulations. This preliminary action ensures the carbon black is pre-prepared with the necessary hydrophilic and dispersible properties, eliminating the need for additional modification steps later.
Solution Approach 2:
The conjugated diamine group modification serves multiple functions simultaneously: it provides hydrophilicity for water interaction, enables self-dispersibility in aqueous environments, and maintains compatibility with inkjet printing processes. This multi-functionality reduces the need for separate modification steps, simplifying the overall manufacturing process while achieving the desired water dispersibility.
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 surface-modified carbon black products exhibit improved hydrophilicity and self-dispersibility, enabling their use in aqueous inkjet inks, reducing milling steps, and providing cost savings while maintaining compatibility with various applications.
Implementation Method 1
reacting a carbon black with a conjugated diimine compound to yield a carbon black product having a conjugated diamine group attached to the carbon black surface
Data Source
AI summary
A process for modifying the surface of a carbon black by contacting said carbon black with a conjugated diimine compound. The conjugated diimine compound may comprise various substituents to provide the carbon black with desired corresponding properties, such as groups to impart increased hydrophilicity and self-dispersibility to the carbon black. Other embodiments relate to novel carbon black products, which may be prepared according to a process of the invention. The carbon black products may be used in the same applications as conventional carbon blacks. Such uses include, but are not limited to, plastic compositions, aqueous inks, aqueous coatings, rubber compositions, paper compositions, and textile compositions. In a specific embodiment, the resulting surface modified carbon black is employed as a pigment in an aqueous inkjet ink composition.