Treated Fluoropolymer Particles for Toner Agglomeration
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Solution Overview
Problem
Electrostatic imaging inks suffer from agglomeration of PTFE particles under electrical fields, leading to print quality defects such as white spots or voids, which significantly reduce the quality of solid prints and make them unusable in some industries.
Innovation Solution
Treated fluoropolymer particles are created by dispersing fluoropolymer particles in a solvent and treating them with a solution of ammonium halide salts, which are then mixed with a carrier liquid and resin, preventing agglomeration by forming a physical or chemical bond that inhibits electrostatic bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fluoropolymer particles are used in electrostatic imaging ink, then high quality offset printing at high speed is achieved, but agglomeration of PTFE occurs under electrical fields causing white spots and voids
Solution Approach 1:
Ammonium halide salts are introduced as intermediary substances that adsorb onto the surface of fluoropolymer particles. These salts act as mediators between the electrical field and the PTFE particles, preventing direct electrostatic bonding while allowing the printing process to proceed at high speed with improved quality.
Solution Approach 2:
The surface properties of fluoropolymer particles are modified by changing the chemical composition parameter - specifically, by adsorbing ammonium halide salts onto the particle surfaces. This parameter change alters the electrostatic characteristics of the particles, eliminating agglomeration while maintaining high printing speed and quality.
2Quantity of substance
If fluoropolymer particles are dispersed in carrier liquid, then toner composition is formed, but particles agglomerate under electrical fields reducing print quality
Solution Approach 1:
Ammonium halide salts serve as intermediary agents that interfere with the electrostatic attraction between fluoropolymer particles. By adsorbing onto particle surfaces, these salts prevent direct particle-to-particle bonding under electrical fields, maintaining toner composition integrity and print quality.
Solution Approach 2:
The harmful effect of electrostatic attraction, which causes agglomeration and white spots, is converted into a beneficial effect. The ammonium halide salts utilize electrostatic principles to adsorb onto particles and prevent harmful agglomeration, turning the electrostatic field from a harmful force into a useful mechanism for particle stabilization.
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 treatment reduces or eliminates agglomeration of fluoropolymer particles by up to 99%, preventing white spots and enhancing print quality by ensuring all pixels are filled during electrostatic development.
Implementation Method 1
treating the fluoropolymer particles with a solution of ammonium halide salts to form treated fluoropolymer particles, wherein the ammonium halide salts disposed onto the surface of the fluoropolymer particles
Implementation Method 2
The agglomeration of PTFE under an electrical field is a known process. The agglomeration of the PTFE can cause print quality defects called white spots
Data Source
AI summary
Toner compositions, treated fluoropolymer particles, methods of making treated fluoropolymer particles, and the like, are disclosed.