Thermal Transfer Sheet Black Dye Layer Jet-Black Tone
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Solution Overview
Problem
Conventional thermal transfer sheets with black dye layers formed by mixing yellow, magenta, and cyan dyes struggle to reproduce a true jet-black color tone with small gradation differences and are prone to color deterioration due to light exposure, as well as dye offset during storage, resulting in unsatisfactory image quality.
Innovation Solution
A thermal transfer sheet with a black dye layer comprising specific combinations of 5 to 7 dyes, including those represented by Formulas (1), (2a), (2b), (3), (4a), (4b), and (5), in specific weight ratios, which are combined with a binder and applied on a substrate, ensuring a jet-black color tone, reduced gradation differences, and minimal dye offset to the back side layer during storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a black dye layer is formed by mixing dyes of yellow, magenta and cyan, then a black image can be formed, but the jet-black color tone cannot be reproduced and large gradation difference occurs
Solution Approach 1:
The patent changes the chemical parameters of the dye composition by introducing specific dye structures (Formulas 1-5) with particular molecular characteristics. This includes using dyes with specific chromophore groups and auxiliary groups that enable true black coloration while maintaining small gradation differences, thereby resolving the color reproduction issue without excessive complexity
Solution Approach 2:
The patent creates a composite dye system by combining multiple dyes with specific structures (Formulas 1-5) in defined weight ratios. This composite approach allows the black dye layer to achieve jet-black color tone and small gradation differences through synergistic effects of the component dyes, while the structured composition prevents catalytic photobleaching
2Reliability
If dyes of yellow, magenta and cyan are mixed to form black, then a black dye layer can be created, but significant color deterioration occurs due to light exposure
Solution Approach 1:
The patent modifies the chemical parameters of the dye molecules by introducing specific structural features (Formulas 1-5) that include stabilizing groups and configurations resistant to photodegradation. This structural parameter change eliminates catalytic photobleaching while maintaining ease of manufacture through conventional thermal transfer processes
Solution Approach 2:
The patent replaces the unstable mixed-dye system (yellow, magenta, cyan) with a more stable single-component or limited-component black dye system (Formulas 1-5). This substitution improves light resistance and color stability while maintaining manufacturing simplicity through direct application of the stable dye formulation
3Stability of the object's composition
If a black dye layer is formed by mixing dyes of yellow, magenta and cyan, then a black image can be produced, but dye offset to the back side layer occurs during storage in wound state
Solution Approach 1:
The patent changes the physical-chemical parameters of the dye molecules (Formulas 1-5) to include structures with improved thermal stability and reduced migratory tendency. This parameter optimization prevents dye offset during wound-state storage while maintaining the jet-black color tone through the specific molecular structures designed for both stability and color accuracy
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 achieves a true jet-black color tone with reduced gradation differences and enhanced light resistance, preventing dye offset during storage, thereby improving the overall image quality and durability of the thermal transfer sheets.
Implementation Method 1
a method is proposed to form various full color images by utilizing a dye for sublimation transfer as a recording material, and thermally transferring the sublimation dye from a thermal transfer sheet onto a transfer-receiving material which can be dyed with sublimation dye
Data Source
AI summary
An object of the present invention is to provide a thermal transfer sheet provided with a black dye layer which can form a black image having jet-black color tone, small gradation difference of black and high resistance to light, and which has little offset of dyes to a back side layer during storage in a wound state. The above object is achieved by a thermal transfer sheet comprising a substrate, a heat resistant slip layer provided on one side of the substrate, and a black dye layer containing a dye and binder provided on the other side of the substrate, wherein the black dye layer contains 2 or 3 kinds of specific magenta dyes and 2 or 3 kinds of cyan dyes in the specific weight ratios with respect to a specific yellow dye.