Inkjet Ink Copolymer Dispersion Stability
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Solution Overview
Problem
Current inkjet inks face challenges in maintaining long-term dispersion stability and achieving high print density, weather resistance, and fixability due to pigment aggregation, which affects productivity and image quality.
Innovation Solution
A copolymer comprising 10-96% cyclohexyl methacrylate, 1-50% acrylic acid, and 1-25% alkyl (meth)acrylate units, with optional styrene, is used to create an inkjet ink pigment dispersion with improved dispersibility and stability, ensuring excellent weather resistance and print quality while maintaining productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pigment dispersion is used in inkjet ink, then color density and weather resistance are improved, but pigment aggregation occurs during long-term storage reducing dispersion stability
Solution Approach 1:
A copolymer comprising a cyclohexyl methacrylate unit, an acrylic acid unit, and an alkyl (meth)acrylate unit is introduced as an intermediary dispersing agent. This copolymer mediates between the pigment particles and the ink medium, providing steric and electrostatic stabilization that prevents pigment aggregation during long-term storage while maintaining excellent dispersion stability.
Solution Approach 2:
The invention uses a composite polymer structure combining three different monomer units (cyclohexyl methacrylate, acrylic acid, and alkyl (meth)acrylate) in specific proportions. This composite material approach allows the dispersing agent to simultaneously provide hydrophobic interaction with pigment particles, electrostatic repulsion through carboxyl groups, and steric stabilization through the alkyl side chains, effectively resolving the contradiction between dispersion stability and pigment aggregation.
2Reliability
If polymer composition is modified to improve dispersion stability, then dispersibility is enhanced, but productivity decreases due to complex manufacturing processes
Solution Approach 1:
The invention optimizes the compositional parameters of the copolymer, specifically setting the cyclohexyl methacrylate unit content at 30-70 mass%, acrylic acid unit at 10-40 mass%, and alkyl (meth)acrylate unit at 10-30 mass%. These parameter ranges achieve the optimal balance between dispersion stability and ease of manufacturing, allowing the copolymer to be synthesized through conventional polymerization processes without requiring complex modification steps.
3Manufacturing precision
If filter filtration or centrifugal separation is used to remove particles, then ink quality is improved, but productivity decreases due to frequent filter exchange and particle removal
Solution Approach 1:
The copolymer dispersing agent performs preliminary stabilization of pigment particles during the ink formulation stage, preventing aggregation before the ink is subjected to filtration or centrifugal separation. This preliminary action ensures that particles remain individually dispersed and stable, significantly reducing the frequency of filter exchanges and particle removal operations during subsequent manufacturing and storage, thereby maintaining high productivity while ensuring ink quality.
Data Source
AI summary
To provide an inkjet ink polymer capable of providing an inkjet ink capable of forming a printed product having excellent weather resistance, print density (coloring properties), and fixability (abrasion properties) with good productivity and providing a pigment dispersion having excellent dispersibility with good productivity. An inkjet ink copolymer contains 10 to 99% by weight of a cyclohexyl methacrylate unit and 1 to 90% by weight of an acrylic acid unit. The purpose is achieved by an inkjet ink pigment dispersion containing the inkjet ink copolymer and a pigment.