Polyester Resin Dispersion for Dyeability and Storage Stability
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Solution Overview
Problem
Existing thermal transfer image-receiving sheets face challenges in achieving balanced dyeability, releasability, and storage stability, with improvements in one aspect often leading to deterioration in another.
Innovation Solution
A resin dispersion for dye receiving layers containing a polyester resin particle made from specific ratios of propylene oxide and ethylene oxide adducts of 2,2-bis(4-hydroxyphenyl)propane and aliphatic dicarboxylic acid compounds, optimized to achieve compatible dyeability, releasability, and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a polyester dispersion is used for the receiving layer to improve dyeability, then the dye transfer efficiency is improved, but the storage stability of the dispersion deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratio of ethylene oxide adduct to propylene oxide adduct (50/50 to 0/100) and the acid value of the polyester (300 to 2,500 eq/10^6 g). These parameter optimizations enable the polyester to achieve both excellent dyeability and storage stability, resolving the contradiction between improved dye transfer efficiency and deteriorated storage stability.
Solution Approach 2:
The patent uses composite materials by combining ethylene oxide adduct of 2,2-bis(4-hydroxyphenyl)propane and propylene oxide adduct of 2,2-bis(4-hydroxyphenyl)propane in specific ratios to create a polyester with balanced properties. This composite approach allows the material to simultaneously achieve good dyeability and storage stability, which cannot be obtained with single-component polyesters.
2Manufacturing precision
If the receiving layer is optimized for dyeability, then the dye transfer efficiency is improved, but the releasability from the transfer sheet deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the acid value of the polyester within the range of 300 to 2,500 eq/10^6 g and controlling the oxide adduct ratio. These parameter adjustments create a receiving layer that achieves both excellent dyeability and releasability, resolving the contradiction between improved dye transfer efficiency and deteriorated releasability from the transfer sheet.
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 provides a thermal transfer image-receiving sheet with enhanced dyeability, releasability, and long-term stability, ensuring effective dye dispersion and easy release from the heat-sensitive transfer medium.
Implementation Method 1
a resin dispersion for a dye receiving layer, containing a polyester resin particle and an aqueous medium
Implementation Method 2
a sublimable dye coated on a heat-sensitive transfer recording medium, such as an ink ribbon, is transferred onto a thermal transfer image-receiving sheet
Implementation Method 3
a sublimable dye coated on a heat-sensitive transfer recording medium, such as an ink ribbon, is transferred onto a thermal transfer image-receiving sheet by a heated printing head
Implementation Method 4
PTL 1 (JP 2010-006976 A) discloses a production method of a polyester dispersion including (1) a step of dissolving a polyester having a Log P value of 3.0 to 5.0 in an organic solvent to obtain a solution of the polyester; (2) a step of adding a neutralizing agent to the solution of the polyester obtained in the step (1) so as to satisfy a formula: 10 ≤ A × B ≤ 18 (wherein A represents a neutralization equivalent of the polyester in the polyester solution, and B represents an acid value (mgKOH/g) of the polyester), thereby neutralizing the polyester; and (3) a step of adding water to the solution of the polyester neutralized in the step (2) to emulsify the polyester
Data Source
AI summary
The present invention is concerned with a resin dispersion for dye receiving layer, a thermal transfer image-receiving sheet, a printing method, and a method for producing a thermal transfer image-receiving sheet, those are excellent in dyeability, releasability, and storage stability, a thermal transfer image-receiving sheet. Disclosed are [1] a resin dispersion for dye receiving layer of a thermal transfer image-receiving sheet containing a polyester resin particle and an aqueous medium; [2] a coating liquid for forming a receiving layer of a thermal transfer image-receiving sheet, containing the resin dispersion of [1]; [3] a thermal transfer image-receiving sheet including a substrate and a receiving layer formed with the coating liquid of [2]; [4] a printing method including bringing a heat-sensitive transfer recording medium containing a dye into contact with the thermal transfer image-receiving sheet of [3] and thermally-transferring the dye onto the thermal transfer image-receiving sheet; and [5] a method for producing a thermal transfer image-receiving sheet.