Heat-Sensitive Transfer Sheet Coating Composition
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Solution Overview
Problem
Existing heat-sensitive transfer image-receiving sheets suffer from issues such as white marks, density unevenness, and reduced sensitivity due to the use of organic solvent-based resin coatings, which affect image formation and sharpness, while water-dispersible emulsion-based sheets compromise on sharpness.
Innovation Solution
A coating composition containing a polymer latex with specific repeating units, derived from monomers represented by certain formulas, is used to form a heat-sensitive transfer image-receiving sheet, providing improved sensitivity and sharpness without surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an organic solvent-based resin coating solution is used, then the cushioning properties and adhesion are improved, but the coating solution fills the foam and void in the foaming layer, causing white marks, density unevenness, and deteriorated heat insulating properties
Solution Approach 1:
The patent changes the fundamental parameter of the coating solution from organic solvent-based to water-based, which fundamentally alters how the coating interacts with the foaming layer. This parameter change allows the coating to preserve the foam structure while achieving adequate adhesion, thereby preventing white marks and density unevenness while maintaining cushioning and heat insulating properties
Solution Approach 2:
The patent uses a composite coating system comprising multiple water-based resins with different functions: a first water-based resin for cushioning and adhesion, a second water-based resin for receiving the dye, and an organic solvent-based resin for improved adhesion. This composite approach allows each component to perform its specific function without interfering with the foaming layer structure
2Object-generated harmful factors
If a water-dispersible emulsion is used, then the environmental burden is reduced and material cost is lowered, but the sharpness of the image deteriorates due to surface roughness
Solution Approach 1:
The patent combines water-based resins (which provide environmental benefits and cost advantages) with an organic solvent-based resin (which provides superior adhesion and surface smoothness). This composite material approach allows the system to maintain the environmental and economic advantages of water-based coatings while achieving the sharpness and surface quality needed for high-resolution images
Solution Approach 2:
The patent applies different resin types to different functional requirements within the same coating layer. The water-based resins provide cushioning and dye-receiving functions, while the organic solvent-based resin specifically addresses adhesion and surface smoothness, ensuring that each local region of the coating performs its designated function optimally
3Strength
If the foaming layer is used to provide cushioning properties, then the adhesion between image-receiving sheet and ink sheet is enhanced, but the heat insulating properties are deteriorated, causing calorie required for dye transfer to be diffused toward the back surface
Solution Approach 1:
The patent changes the chemical composition parameter of the coating solution from organic solvent-based to water-based, which fundamentally alters how the coating penetrates and interacts with the foaming layer. This parameter change allows the coating to maintain the physical structure of the foam, preserving its heat insulating properties while still achieving adequate adhesion through the composite resin system
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 results in a heat-sensitive transfer image-receiving sheet with high sensitivity, minimal image defects, and enhanced sharpness, facilitating effective image formation and storage.
Implementation Method 1
a heat-sensitive transfer image-receiving sheet having a high sensitivity and little image defects
Implementation Method 2
the image-receiving sheet comprising such paper as a support normally comprises a layer having high cushioning properties such as foaming layer made of resin and foaming agent
Implementation Method 3
the heat insulating properties of the foaming layer are deteriorated to cause calorie required for dye transfer to be diffused toward the back surface of the image-receptive sheet
Data Source
AI summary
A coating composition for producing a heat-sensitive transfer image-receiving sheet comprising at least one receiving layer on a support, wherein the coating composition contains a polymer latex containing a repeating unit derived from a monomer represented by the following formula:wherein R1 represents a hydrogen atom, halogen atom or methyl group; L1 represents a divalent connecting group; and Z represents a C8-C50 straight-chain, branched or cyclic hydrocarbon group.