Thermal Transfer Receiving Sheet with Modified Silicone Release Layer
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Solution Overview
Problem
Thermal transfer image-receiving sheets using polyester resin in the receiving layer face challenges in achieving balanced releasability and protective layer transferability, especially under severe environmental conditions, due to thermal fusion issues with acetal-based resins and the need for high light resistance.
Innovation Solution
A thermal transfer image-receiving sheet is developed with a receiving layer composed of 1-8% modified silicone with aminoalkyl and polyalkylene ether groups and 0.1-4% curing agent based on polyester resin, applied as a coating solution on a substrate sheet, ensuring good releasability and protective layer transferability while maintaining environmental preservability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyester resin is used in the receiving layer to achieve high light resistance, then light resistance is improved, but releasability deteriorates due to thermal fusion with acetal-based resin
Solution Approach 1:
A release agent layer is introduced as an intermediary between the polyester resin receiving layer and the thermal transfer sheet. This release agent prevents direct thermal fusion between the polyester resin and acetal-based resin, enabling both high light resistance and proper releasability to be achieved simultaneously.
Solution Approach 2:
The chemical composition and physical properties of the receiving layer are modified by incorporating specific release agents and adjusting resin ratios. This changes the thermal and surface properties of the layer, allowing it to maintain polyester resin's light resistance while achieving adequate releasability through controlled interaction with the thermal transfer sheet.
2Ease of operation
If a large amount of releasing agent is added to the receiving layer to secure releasability, then releasability is improved, but protective layer transferability deteriorates
Solution Approach 1:
The amount and type of release agent are precisely controlled within specific ranges (0.1-10 parts by weight per 100 parts polyester resin). This optimized parameter selection ensures sufficient releasability while maintaining protective layer transferability, avoiding the trade-off that occurs with excessive release agent addition.
Solution Approach 2:
The receiving layer is formulated as a composite material combining polyester resin with specific release agents and optionally polyurethane resin. This composite structure integrates multiple functions: light resistance from polyester, controlled releasability from release agents, and protective layer transferability maintained through balanced composition.
3Reliability
If polyester resin is used in the receiving layer, then light resistance is improved, but environmental preservability deteriorates under severe conditions
Solution Approach 1:
The receiving layer is formulated as a composite material combining polyester resin with specific release agents and optionally polyurethane resin. This composite structure integrates multiple functions: light resistance from polyester, controlled releasability from release agents, and protective layer transferability maintained through balanced composition.
Solution Approach 2:
The chemical composition and physical properties of the receiving layer are modified by incorporating specific release agents and adjusting resin ratios. This changes the thermal and surface properties of the layer, allowing it to maintain polyester resin's light resistance while achieving adequate releasability through controlled interaction with the thermal 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 superior releasability, protective layer transferability, and environmental preservability, even after storage under high temperature and high humidity conditions, preventing thermal fusing and ensuring reliable image printing and preservation.
Implementation Method 1
use of a polyester-based resin in a receiving layer causes a problem in that it is difficult to secure a proper releasability between a thermal transfer sheet and an image-receiving sheet because the acetal-based resin and the polyester-based resin are liable to be thermally fused during printing
Implementation Method 2
a receiving layer which comprises a polyester resin and has a structure in which a modified silicone (I) modified with both groups of an aminoalkyl group and a polyalkylene ether group is incorporated in an amount of 1 to 8% by weight and a curing agent is incorporated in an amount of 0.1 to 4% by weight based on 100 parts by weight of the polyester resin
Data Source
AI summary
A thermal transfer image-receiving sheet which comprises a substrate sheet and a receiving layer comprising a polyester resin provided on at least one surface of the substrate sheet, wherein the receiving layer is a layer formed by applying a coating solution comprising 1 to 3% by weight of a modified silicone oil (I) modified with both groups of an aminoalkyl group and a polyalkylene ether group, and 0.1 to 4.0% by weight of a curing agent based on 100 parts by weight of the polyester resin, and drying the solution, 0.2 to 3% by weight of a polyether-modified silicone oil (II) and/or phenol-modified silicone oil (III) being contained in the coating solution, if desired.