Conductive Thermal Image Receiver Element Humidity Resistance
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Solution Overview
Problem
Aqueous-coated dye image receiving layers in thermal transfer systems face issues with sticking between surfaces in high humidity environments, inadequate dye density, and instability when exposed to water, leading to inconsistent and low-quality thermal dye transfer images.
Innovation Solution
A conductive thermal image receiver element with an aqueous-based coatable dye-receiving layer and a receiver overcoat layer, comprising a support with an electrically conductive layer, a water-dispersible acrylic polymer, a water-dispersible polyester, and a conductive polymeric material, which enhances humidity resistance and dye density, preventing sticking and improving image quality.
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 between surfaces in high humidity environments and provides inadequate dye density
Solution Approach 1:
The patent uses a composite polymer binder system combining water-dispersible acrylic polymer (55-90 wt%) with polyester polymer (10-45 wt%). This composite formulation integrates the water dispersibility and adhesion benefits of acrylic with the dimensional stability and low sticking characteristics of polyester, achieving both environmental safety and reliability in humid conditions
Solution Approach 2:
The patent specifies precise parameter ranges for the polymer components: acrylic polymer with glass transition temperature of -50°C to 50°C, polyester with specific viscosity range, and controlled water content (40-60 wt%). These parameter optimizations ensure the coating maintains appropriate viscosity for application while providing sufficient dye density and humidity resistance after drying
2Ease 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 provides inadequate dye density in the thermally formed images
Solution Approach 1:
The patent optimizes the polymer binder parameters including molecular weight, glass transition temperature, and water content to control the coating's dye absorption and retention characteristics. The acrylic polymer's glass transition temperature range (-50°C to 50°C) is specifically selected to balance water dispersibility with dye binding capacity, ensuring adequate dye density while maintaining environmental safety
Solution Approach 2:
The composite polymer system combines acrylic and polyester in specific ratios to achieve synergistic effects: acrylic provides water dispersibility and dye affinity, while polyester contributes to film formation and dye retention, together delivering both environmental benefits and sufficient dye density
3Ease 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 falls apart when contacted with water and exhibits inconsistent performance in varying humidity conditions
Solution Approach 1:
The patent employs a composite polymer binder system where water-dispersible acrylic polymer (55-90 wt%) provides water resistance after drying through cross-linking, while polyester polymer (10-45 wt%) contributes dimensional stability and structural integrity. This composite approach ensures the coating resists water contact damage while maintaining environmental safety during manufacturing
Solution Approach 2:
The patent incorporates cross-linking agents in the aqueous coating formulation that activate during drying to form cross-linked polymer networks before water contact occurs. This preliminary cross-linking action pre-strengthens the coating structure, preventing it from falling apart when subsequently exposed to water or humidity variations
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 transfer and enhanced image density, reducing misregistrations and defects like buckling and creasing, while maintaining print quality across varying environmental conditions.
Implementation Method 1
a water-dispersible conductive polymeric material
Implementation Method 2
aqueous-based coatable dye-receiving layer
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
This invention relates to a conductive thermal image receiver element that has an aqueous-based coatable dye-receiving layer comprising a water-dispersible acrylic polymer, a water-dispersible polyester, a water-dispersible conductive polymeric material and a surfactant. 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.