Thermal Transfer Recording Sheet Dye Composition
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Solution Overview
Problem
Existing thermal transfer recording methods face challenges in producing high-chroma images with a wide color gamut and high-quality black images due to the limitations of colorant combinations, which result in incomplete absorption of wavelengths when mixing colors, hindering the production of high-quality black.
Innovation Solution
A thermal transfer recording sheet is developed with a colorant layer comprising specific yellow, magenta, and cyan dye layers, where the magenta dye is represented by General Formula (1), the yellow dye by General Formula (2), and the cyan dye by one of the compounds represented by General Formulae (3) to (5), allowing for improved chroma and color gamut reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-chroma dyes with steep and narrow absorption spectra are used to increase image vividness and color-reproduction capability, then color saturation is improved, but wavelength components that are not absorbed remain when colors are mixed, hindering high-quality black production
Solution Approach 1:
The invention changes the spectral absorption parameters of the dye combination by selecting specific yellow, magenta, and cyan dyes with complementary absorption characteristics. The yellow dye absorbs in the cyan region, the magenta dye absorbs in the green region, and the cyan dye absorbs in the yellow-green region, creating overlapping absorption spectra that collectively cover the entire visible range, enabling both high color saturation and high-quality black production.
Solution Approach 2:
The invention uses a composite colorant system combining three different dye materials with specific chemical structures (yellow dye with azo or anthraquinone structure, magenta dye with xanthene or azo structure, cyan dye with triphenylmethane or cyanine structure). This composite approach allows the combination of individual dye advantages while achieving uniform absorption across the visible spectrum for high-quality process black.
2Manufacturing precision
If a combination of colorants achieving uniform absorption over the entire visible spectrum is used to produce high-quality process black, then black image quality is improved, but image vividness and color-reproduction capability are reduced
Solution Approach 1:
The invention optimizes the absorption spectrum parameters of each individual dye while maintaining their complementary relationships. By carefully selecting dyes with specific absorption peak positions and bandwidths, the system achieves both uniform overall absorption (for quality black) and high peak absorption (for vivid colors). The yellow dye has its absorption peak in the cyan region, magenta in the green region, and cyan in the yellow-green region, creating overlapping coverage.
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
This configuration enables the formation of high-chroma images with a wide color gamut and high-quality black images by ensuring uniform absorption across the visible spectrum, enhancing the color reproduction capability and lightfastness.
Implementation Method 1
the higher the image vividness and color-reproduction capability required, the higher the chroma of the dyes needs to be, with such dyes exhibiting a steep and narrow absorption spectrum
Implementation Method 2
the coloring matter included in the thermal transfer sheet is transferred to the image-receiving sheet by heating the thermal transfer sheet
Data Source
AI summary
An object of the present invention is to provide a thermal transfer recording sheet that enables high-chroma images to be formed, has a high color-developability that enables a wide color gamut to be achieved, and enables high-quality black images to be formed using process black. The thermal transfer recording sheet includes a base material, and a yellow dye layer including a yellow dye, a magenta dye layer including a magenta dye, and a cyan dye layer including a cyan dye that are disposed on the base material. The magenta dye, yellow dye, and cyan dye each contain specific compounds.