Electrostatic Ink Graft Copolymer Transfer Efficiency
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Solution Overview
Problem
Electrostatic printing processes face challenges in the transfer of ink from an intermediate transfer member to a print substrate, particularly in terms of background accumulation and adhesion, where existing solutions do not adequately address the issue of ink transfer efficiency and scratch resistance.
Innovation Solution
The use of a graft co-polymer with an acrylate polymer backbone onto which polysiloxane side chains are grafted, dispersed in a carrier liquid, improves ink transfer and adhesion to the substrate, enhancing the efficiency of ink transfer and scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrostatic printing processes are used, then the printing process can be completed, but background accumulation on the intermediate transfer member occurs and ink adhesion is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the toner particles by incorporating specific polymers (polycarbonate, polyester, polyacrylic) with defined glass transition temperatures and charge densities. This changes the physical-chemical parameters of the ink composition to improve transfer efficiency while reducing background accumulation on the intermediate transfer member.
Solution Approach 2:
The patent uses composite toner particles consisting of multiple polymer components with different properties. The combination of polycarbonate, polyester, and polyacrylic creates a composite material that simultaneously achieves good adhesion to the substrate and minimal background accumulation, resolving the contradiction between transfer efficiency and background contamination.
2Strength
If conventional inks are used, then printing can be performed, but scratch resistance of the printed ink is poor
Solution Approach 1:
The patent optimizes the glass transition temperature range (50-150°C) and charge density parameters of the polymer components to achieve the right balance between adhesion and scratch resistance. By controlling these parameters, the ink adheres well to the substrate while forming a durable layer resistant to scratching.
Solution Approach 2:
The patent creates different local properties within the toner particle structure by using multiple polymer components with different Tg values. The outer layer has properties optimized for adhesion while the inner composition provides scratch resistance, achieving both requirements simultaneously through spatial differentiation of material properties.
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 graft co-polymer significantly reduces background accumulation on the intermediate transfer member, improves cleaning efficiency, and enhances the adhesion and scratch resistance of the printed ink, leading to better print quality and durability.
Implementation Method 1
The charged toner particles adhere to the image areas of the latent image while the background areas remain clean
Implementation Method 2
The use of a graft co-polymer with an acrylate polymer backbone onto which polysiloxane side chains are grafted, dispersed in a carrier liquid, improves ink transfer and adhesion to the substrate
Data Source
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AI summary
Methods of Printing and Electrostatic Ink Compositions Herein are disclosed electrostatic ink compositions, methods of printing and printed substrates. In some examples, the electrostatic ink composition comprises a carrier liquid, particles comprising a graft co-polymer comprising an acrylate polymer backbone onto which has been grafted polysiloxane side chains, wherein the particles are dispersed in the carrier liquid.