Conductive Dye-Receiving Layer for Thermal Transfer
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Solution Overview
Problem
Aqueous-coated thermal image receiver elements face challenges in high-speed printing environments due to sticking issues between dye donor and receiver elements, particularly in high humidity, and often result in inadequate dye density and instability when exposed to water, necessitating improved resistance to humidity changes and enhanced printing consistency.
Innovation Solution
A conductive thermal image receiver element with an aqueous-based coatable dye-receiving layer comprising a release agent, cross-linking agent, antifoamers, surfactants, and a polymer binder matrix of water-dispersible acrylic and polyester polymers, which includes a water-dispersible conductive polymeric material to enhance electrical conductivity and prevent sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aqueous coating formulations are used to prepare the dye image receiving layer, then environmental hazards and manufacturing costs are reduced, but the layer exhibits sticking issues in high humidity environments and inadequate dye density
Solution Approach 1:
The patent modifies the chemical composition parameters of the aqueous coating formulation by incorporating specific polymers (acrylic and polyester), release agents, cross-linking agents, and conductive polymeric materials. These parameter changes enhance the layer's resistance to humidity-induced sticking while maintaining adequate dye density and image quality.
Solution Approach 2:
The invention uses a composite material system combining multiple components: water-dispersible acrylic polymer, water-dispersible polyester, release agents, cross-linking agents, and conductive polymeric materials. This composite formulation achieves both environmental friendliness and improved printing reliability by leveraging the synergistic effects of different materials.
2Productivity
If high speed printing is required, then productivity increases, but sticking between dye donor and receiver elements occurs particularly in high humidity
Solution Approach 1:
The patent introduces release agents and conductive polymeric materials as intermediary substances in the aqueous coating formulation. These intermediaries prevent direct sticking between the dye donor and receiver elements by creating a controlled interface that reduces adhesion forces, enabling high-speed printing without sticking issues.
Solution Approach 2:
The invention replaces purely mechanical separation methods with electrostatic management through conductive polymeric materials. The conductive components dissipate static charges that would otherwise cause sticking, providing a more reliable separation mechanism that works effectively at high printing speeds.
3Object-affected harmful factors
If conventional aqueous-coated layers are used, then environmental impact is reduced, but the layers fall apart when contacted with water and show instability
Solution Approach 1:
The patent applies cross-linking agents to the aqueous coating formulation before the layer is fully formed and dried. This preliminary chemical modification creates cross-linked polymer networks that pre-strengthen the layer structure, preventing it from falling apart upon water contact while maintaining environmental compatibility.
Solution Approach 2:
The invention changes the chemical parameters of the aqueous formulation by incorporating cross-linking agents and specific polymer ratios. These parameter modifications transform the layer from a water-soluble state to a water-resistant cross-linked network, achieving both environmental friendliness and compositional stability.
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 solution provides improved resistance to humidity changes, ensuring consistent dye density and preventing sticking issues, thereby enhancing the reliability and quality of thermal dye transfer images across varying environmental conditions.
Implementation Method 1
a water-dispersible conductive polymeric material to enhance electrical conductivity and prevent sticking
Implementation Method 2
a cross linking agent, a water-dispersible acrylic polymer, and a water-dispersible polyester
Data Source
AI summary
This invention relates to a conductive thermal image receiver element that has an aqueous coatable dye-receiving layer. The dye-receiving layer comprises a conductive polymeric material, a dispersant, one or more surfactants, one or more antifoamers, a water-dispersible release agent, a crosslinking agent, and a polymer binder matrix consisting essentially of a water-dispersible polyester and a water-dispersible acrylic polymer. This invention also relates to a method for making this thermal image receiver element as well as method for using it to provide a dye image by thermal transfer from a donor element.