Electrostatic Ink Composition Low Molecular Weight Resin
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Solution Overview
Problem
Existing electrostatic printing inks with conductive particles coated in resins often face issues with insufficient transfer from the blanket to the substrate and inadequate conductivity for specific applications, leading to suboptimal performance in forming conductive traces.
Innovation Solution
An electrostatic ink composition comprising a resin with a molecular weight of 10,000 or less and a conductive species making up at least 30 wt.% of the total solids content, featuring elongate conductive species such as carbon nanotubes, which align and interconnect upon fusion to enhance conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive particles are coated in resins for electrostatic printing, then the ink can be applied to the photoconductive surface, but the transfer from blanket to substrate is insufficient and conductivity is inadequate
Solution Approach 1:
The patent changes the molecular weight parameter of the resin binder from conventional high molecular weight to low molecular weight (10,000 or less). This parameter change enables the resin to effectively bind high levels of conductive species (at least 30 wt.%) while maintaining good transfer properties and forming continuous conductive traces on the substrate.
Solution Approach 2:
The patent creates a composite material system consisting of low molecular weight resin binder and elongate conductive species (such as carbon nanotubes). This composite structure allows the conductive species to align and interconnect during the printing process, forming continuous conductive pathways that simultaneously achieve high conductivity and effective transfer.
2Quantity of substance
If higher loading levels of conductive species are used to improve conductivity, then conductivity increases, but transfer from blanket to substrate becomes insufficient
Solution Approach 1:
The patent changes the molecular weight parameter of the resin binder to low molecular weight (10,000 or less), which fundamentally alters the binding characteristics. This enables the resin to effectively bind high concentrations of conductive species (at least 30 wt.%) while maintaining adequate transfer performance, resolving the contradiction between conductive species loading and transfer efficiency.
3Stability of the object's composition
If conventional resins are used to bind conductive species, then the ink formulation is stable, but the conductive species do not align and interconnect effectively to form continuous traces
Solution Approach 1:
The patent changes the molecular weight parameter of the resin binder to low molecular weight (10,000 or less), which modifies the rheological and binding properties of the resin. This enables the elongate conductive species to align and interconnect effectively during the printing process, forming continuous conductive traces while maintaining ink formulation stability.
Solution Approach 2:
The patent utilizes the elongate (rod-like) shape of the conductive species (such as carbon nanotubes) which have high aspect ratios. During the printing process, these elongate species align along the direction of application and interconnect to form continuous conductive pathways, achieving effective trace formation.
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 ink composition achieves higher conductivity levels in printed conductive traces by allowing for higher loading levels of conductive species and ensuring effective alignment and interconnection of elongate conductive species during the printing process.
Implementation Method 1
The charged toner particles adhere to the image areas of the latent image
Implementation Method 2
elongate conductive species such as carbon nanotubes, which align and interconnect upon fusion to enhance conductivity
Data Source
Figure 1
Figure 2A~2B
AI summary
The present disclosure is drawn to an electrostatic ink composition comprising a resin having a Mw of 10,000 or less and a conductive species. Also disclosed herein is a substrate on which is electrostatically printed a conductive trace, wherein the trace comprises a resin having a Mw of 10,000 or less and a conductive species. Further disclosed herein is a method of electrophotographic printing an electrostatic ink composition comprising a resin having a Mw of 10,000 or less and a conductive species.