Thermal Transfer Printed Products with Deep-Penetrating Yellow Dye
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Solution Overview
Problem
Pyridone azo dyes used in thermal transfer recording systems suffer from light-induced decomposition due to limited penetration into the receiving layer, leading to degradation of the coloring material.
Innovation Solution
A printed product is developed with a yellow image and surface protective layer formed using a thermal transfer recording sheet, where a compound represented by a specific general formula permeates into the coloring material receiving layer to a depth of 2 μm or more, enhancing light fastness and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pyridone azo dye is used as coloring material in thermal transfer recording system, then the system can control dye migration by heat and achieve gray-scale image formation, but the dye permeates only to slight extent into receiving layer and remains near surface, causing light-induced decomposition
Solution Approach 1:
The patent modifies the chemical structure of the pyridone azo dye by introducing specific substituents (R1-R7 groups) to change its permeation characteristics. This structural parameter change enables the dye to penetrate deeper into the receiving layer while maintaining controlled migration behavior, thereby improving light fastness without sacrificing manufacturing precision.
Solution Approach 2:
The patent creates a composite coloring material system combining the modified pyridone azo dye with specific carriers or additives that facilitate deep penetration into the receiving layer. This composite approach allows the dye to achieve both controlled migration and deep permeation, resolving the contradiction between manufacturing precision and light fastness.
2Productivity
If dye is caused to migrate from coloring material layer to receiving layer by heat, then image formation is achieved, but the dye remains near surface and is exposed to light, accelerating decomposition
Solution Approach 1:
The patent introduces an intermediary substance or modified molecular structure that acts as a bridge between the coloring material layer and receiving layer. This intermediary facilitates deep penetration of the dye into the receiving layer while protecting it from direct light exposure, thus reducing light-induced decomposition without compromising image formation efficiency.
Solution Approach 2:
By changing the chemical parameters of the dye molecule (introducing specific R1-R7 substituents), the patent optimizes both the migration behavior and penetration depth of the dye. This parameter change allows the dye to reach deep into the receiving layer where it is protected from light, solving the contradiction between productivity and resistance to harmful factors.
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 printed product with high density and improved light fastness by ensuring the compound penetrates deeply into the receiving layer, protecting the dye from light-induced degradation.
Implementation Method 1
a yellow image and a surface protective layer are formed by sequentially applying heat to a yellow coloring material layer and a surface protective layer forming region through use of a thermal transfer recording sheet
Implementation Method 2
the compound represented by the general formula (1) permeates into the coloring material receiving layer to a depth of 2 μm or more
Data Source
AI summary
A printed product including: a yellow image formed on an image receiving sheet including a coloring material receiving layer and a surface protective layer formed on the yellow image, wherein the yellow image and the surface protective layer are formed by sequentially applying heat to a yellow coloring material layer for forming the yellow image and a surface protective layer forming layer for forming a surface protective layer through use of a thermal transfer recording sheet including the yellow coloring material layer and the surface protective layer forming layer field sequentially; the yellow coloring material layer contains a compound having a predetermined structure as a yellow coloring material, and wherein in the printed product having formed thereon the yellow image and the surface protective layer, the compound permeates into the coloring material receiving layer to a depth of 2 μm or more.