Oil-Based Inkjet Ink Dispersant for Pigment Aggregation Control
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Solution Overview
Problem
Oil-based inkjet inks tend to form aggregates when exposed to external forces, such as sliding in ink pathways, due to increased cohesive forces around pigments with free acidic groups, leading to instability and printing issues.
Innovation Solution
The use of a dispersant formed with an acidic resin, a low-molecular weight amine compound, and a basic polymer in oil-based inkjet inks, which bonds with the acidic groups to reduce free acidic groups and prevent pigment aggregation, thereby stabilizing the ink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pigment with free acidic groups is used in oil-based inkjet ink, then color strength and pigment loading are improved, but aggregate formation increases under external forces
Solution Approach 1:
A dispersant comprising a basic polymer and a low-molecular-weight amine compound is introduced as an intermediary substance between the pigment particles and the ink medium. The basic polymer provides steric stabilization while the low-molecular-weight amine compound neutralizes free acidic groups on pigment surfaces through chemical bonding. This dual-component dispersant system effectively prevents aggregate formation by simultaneously addressing both steric and electrostatic stabilization needs, allowing high pigment loading while maintaining ink stability under external forces such as shear stress in ink pathways.
2Stability of the object's composition
If dispersant is added to prevent pigment aggregation, then ink stability is improved, but ink composition complexity increases
Solution Approach 1:
The dispersant system merges two functional components into a single coordinated agent: a basic polymer providing steric stabilization and a low-molecular-weight amine compound neutralizing acidic groups. This combined approach achieves effective pigment dispersion and aggregation prevention while maintaining relatively simple ink composition. The synergistic interaction between the two dispersant components allows for effective stabilization without requiring multiple separate additives, thus balancing ink stability improvement with composition simplicity.
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 solution effectively reduces the formation of aggregates in oil-based inkjet inks even under external forces, enhancing jetting stability and storage stability by maintaining pigment dispersion, resulting in improved image quality and print performance.
Implementation Method 1
a dispersant formed with an acidic resin, a low-molecular weight amine compound and a basic polymer
Implementation Method 2
bonds with the acidic groups to reduce free acidic groups and prevent pigment aggregation
Implementation Method 3
a dispersant formed with an acidic resin, a low-molecular weight amine compound and a basic polymer
Implementation Method 4
removing water from the water-in-oil emulsion to obtain a dispersant dispersion
Data Source
AI summary
An oil-based inkjet ink is disclosed that contains a pigment, a dispersant formed with an acidic resin, a low-molecular weight amine compound and a basic polymer, and a non-aqueous solvent. A method for producing an oil-based inkjet ink and a method for producing a dispersant is also disclosed.