Thermal Transfer Image-Receiving Sheet Dye Receiving Layer
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Solution Overview
Problem
Existing thermal transfer image-receiving sheets face issues with dyeability, releasability, and light fastness, leading to fusion with ink sheets and discoloration over time, which are not adequately addressed by existing technologies.
Innovation Solution
A thermal transfer image-receiving sheet with a dye receiving layer formed from a resin composition containing a graft polymer with a polyester resin main chain and an addition polymer-based resin side chain, where the resin composition has a specific glass transition temperature range, enhancing dyeability, releasability, and light fastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thermal transfer image-receiving sheet has high dyeability with dyes, then the sheet can exhibit aimed color, but the ink sheet and the thermal transfer image-receiving sheet are fused together upon coloring
Solution Approach 1:
The patent changes the chemical composition parameters of the receiving layer by incorporating specific polymers (polyester resin, polyurethane resin, polyvinylidene chloride resin) in controlled ratios. This modifies the thermal and chemical properties of the layer to achieve high dyeability while preventing fusion with the ink sheet during thermal transfer printing
Solution Approach 2:
The patent uses a composite material system consisting of multiple polymer types (polyester resin, polyurethane resin, polyvinylidene chloride resin) combined in specific proportions. This composite structure provides both high dyeability and releasability by combining the advantageous properties of different polymer materials
2Reliability
If the thermal transfer image-receiving sheet has high dyeability with dyes, then the sheet can exhibit aimed color, but the resulting print suffers from discoloration owing to change in quality with time
Solution Approach 1:
The patent employs a composite polymer system where polyester resin provides dyeability, polyurethane resin contributes to flexibility and adhesion, and polyvinylidene chloride resin enhances light fastness and durability. This multi-component composite material simultaneously achieves high dyeability and resistance to discoloration over time
Solution Approach 2:
The patent optimizes the molecular weight, glass transition temperature, and compositional ratios of the polymer components to achieve a balance between dyeability and long-term stability. By controlling these physical and chemical parameters, the receiving layer maintains both high color uptake and resistance to environmental degradation
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 sheet exhibits improved dyeability, releasability, and light fastness, preventing fusion with ink sheets and reducing discoloration, thereby meeting the demands for high-quality, long-lasting images.
Implementation Method 1
the resin composition has a specific glass transition temperature range, enhancing dyeability, releasability, and light fastness
Implementation Method 2
the dye is heated using a thermal head of a printer as a heating means and transferred on the image-receiving sheet
Data Source
AI summary
The present invention relates to a thermal transfer image-receiving sheet including a dye receiving layer formed of a resin composition for thermal transfer image-receiving sheets, wherein said resin composition includes a resin composition (A) containing a graft polymer (A0) which contains a main chain segment (A1) formed of a polyester resin obtained by polycondensing an alcohol component containing an alkyleneoxide adduct of 2,2-bis(4-hydroxyphenyl)propane in an amount of 50 mol % or more with a carboxylic acid component, and a side chain segment (A2) formed of an addition polymer-based resin, and has a glass transition temperature of 50° C. or higher; and a resin composition (B) containing a resin (B0) and having a glass transition temperature lower by from 10 to 80° C. than the glass transition temperature of the resin composition (A), and to a process for producing the thermal transfer image-receiving sheet.