Conductive Thermal Receiver Layer Humidity Sticking
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Solution Overview
Problem
Aqueous-coated thermal image receiver elements face issues with sticking in high humidity environments, inadequate dye density, and instability when exposed to water, leading to inconsistent thermal dye transfer images.
Innovation Solution
A conductive thermal image receiver element with an aqueous-based coatable dye-receiving layer comprising a release agent, cross-linking agent, water-dispersible acrylic polymer, and conductive polymeric material, which includes a receiver overcoat layer with a surfactant, enhancing the layer's resistance to humidity and improving dye density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aqueous coating formulations are used to prepare the dye image receiving layer, then environmental safety and manufacturing cost are improved, but sticking occurs in high humidity environments and dye density is inadequate
Solution Approach 1:
A silicone release agent is introduced as an intermediary substance between the aqueous coating formulation and the thermal image receiver element surface. This release agent prevents direct adhesion between the coating and the element, eliminating sticking problems in high humidity environments while preserving the environmental benefits of aqueous formulations.
Solution Approach 2:
The surface energy parameters of the aqueous coating formulation are modified by adding the silicone release agent. This changes the wettability and adhesion characteristics of the coating, preventing excessive adhesion that causes sticking while maintaining adequate coating formation for dye reception.
2Object-affected harmful factors
If aqueous coating formulations are used to prepare the dye image receiving layer, then environmental safety and manufacturing cost are improved, but dye density in thermally formed images is inadequate
Solution Approach 1:
The polymer matrix composition parameters are optimized by selecting specific water-dispersible polymers with appropriate molecular weights and functional groups. This enhances the coating's ability to bind and retain dye molecules, achieving adequate dye density while maintaining the environmental advantages of aqueous formulations.
Solution Approach 2:
The aqueous coating formulation is designed as a composite system combining water-dispersible polymer, silicone release agent, and dye-receiving components. This composite structure provides multiple functions: the polymer matrix binds dye, the silicone prevents sticking, and the aqueous base ensures environmental safety.
3Object-affected harmful factors
If aqueous-coated dye image receiving layers are used, then environmental safety is improved, but the layers fall apart when contacted with water
Solution Approach 1:
The cross-linking density and polymer composition parameters are adjusted to create a water-resistant network structure. The silicone release agent and cross-linking agents create hydrophobic interactions and covalent bonds that prevent water penetration and layer disintegration, while the aqueous formulation remains environmentally safe during application.
Solution Approach 2:
The coating forms a composite structure where water-dispersible polymers provide the base matrix, cross-linking agents create a water-resistant network, and silicone release agents provide hydrophobic protection. This multi-component composite achieves both environmental safety and water 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 transfer and increased dye density, reducing sticking issues and enhancing the stability of thermal images.
Implementation Method 1
improving the electrical conductivity of the thermal image receiver element to reduce the buildup of static charge
Implementation Method 2
an aqueous-based coatable dye-receiving layer comprising a release agent, cross-linking agent, water-dispersible acrylic polymer, and conductive polymeric material
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.