Amphoteric Polymer Liquid Dispersant for Ink Jet Bleeding Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ink jet recording methods face challenges with bleeding and lack of sharpness at color boundaries due to ink agglomeration and penetration issues, leading to unsatisfactory abrasion resistance and preservability of recorded materials.
Innovation Solution
An ink jet recording method using a liquid dispersant with an amphoteric polymer having a cationic core and anionic shell, which enhances the fixing property of cationic ink by forming firm agglomerates on the recording medium, reducing bleeding and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an acidic water-soluble resin is used for the processing liquid to prevent bleeding at color boundaries, then image quality is improved, but modification occurs to the recording medium with prolonged preservation, degrading preservability
Solution Approach 1:
The patent changes the pH parameter of the processing liquid from acidic (conventional) to neutral or slightly basic (invention), eliminating the harmful acidic effect on recording medium preservability while maintaining bleeding prevention through the amphoteric polymer's unique charge characteristics
Solution Approach 2:
The patent uses an amphoteric polymer that contains both cationic and anionic groups within the same molecule, creating a composite functional material that can interact with both cationic and anionic dyes, providing superior fixing performance compared to conventional single-charge resins
2Strength
If a polyvalent metal-containing reaction liquid is used to destabilize coloring material and improve adhesion, then abrasion resistance is improved, but the reaction liquid must be acidic, causing modification to the recording medium and deteriorating preservability
Solution Approach 1:
The patent removes the polyvalent metal component from the processing liquid formulation, eliminating the need for acidic conditions while maintaining the destabilizing effect on coloring material through the amphoteric polymer's direct electrostatic interactions
Solution Approach 2:
The patent changes the chemical composition parameter by substituting polyvalent metal ions with amphoteric polymer molecules, allowing the system to function at neutral pH and thus preserve the recording medium
3Manufacturing precision
If a nonionic water-soluble polymer is used to increase adhesion property of coloring material accumulations, then images without color bleeding are obtained, but the polymer is re-dissolved even after forming a film, making water-resistant and marker-resistant properties inferior
Solution Approach 1:
The patent employs an amphoteric polymer containing both cationic and anionic groups that forms a composite structure with coloring materials through electrostatic interactions, creating a more robust and water-resistant film compared to conventional nonionic polymers
Solution Approach 2:
The patent changes the polymer chemistry from nonionic to amphoteric, enabling the formation of strong electrostatic bonds with coloring materials that resist dissolution and provide superior water and marker resistance
4Manufacturing precision
If an amphoteric ionic polymer compound is used to increase viscosity of the mixture and prevent color bleeding, then bleeding is prevented, but fixing of the coloring material is not considered, resulting in unsatisfactory adhesiveness
Solution Approach 1:
The patent optimizes the molecular weight and charge density parameters of the amphoteric polymer to achieve the right balance between viscosity (for bleeding prevention) and adhesion (for fixing), creating a more effective processing liquid formulation
Solution Approach 2:
The patent creates a composite system where the amphoteric polymer simultaneously provides viscosity control for bleeding prevention and strong electrostatic fixing for adhesion, combining both functions in a single material
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 method achieves high-definition images with reduced bleeding, excellent abrasion resistance, and improved preservability by forming firm agglomerates of the coloring material on the recording medium, enhancing the overall quality of the recorded materials.
Implementation Method 1
the reaction liquid has the function of destabilizing a dissolved or dispersed state of the coloring material in the ink so that the nonionic polymer increases the adhesion property of accumulations of coloring material matters
Implementation Method 2
an amphoteric polymer containing a core portion having a cation group and a shell portion having an anion group that covers the core portion
Data Source
AI summary
An ink jet recording method including attaching a liquid dispersant in which an amphoteric polymer containing a core portion having a cation group and a shell portion having an anion group that covers the core portion is dispersed in a dispersing medium to a recording medium and discharging and attaching cationic ink containing a coloring material and water to the surface of the recording medium to which the liquid dispersant is attached.