Protective Layer Transfer Sheet Resin Tg Optimization
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Solution Overview
Problem
Existing protective layers for thermal transfer images face a trade-off between durability and foil tearing, with current solutions failing to simultaneously achieve both physical and chemical durability while maintaining good transferability.
Innovation Solution
A protective layer transfer sheet and intermediate transfer medium are developed, featuring a transfer layer with a protective layer containing an acrylic polyol resin with a glass transition temperature above 80°C or a polyester polyurethane resin with a glass transition temperature above 50°C, along with a peeling layer and optional adhesive and backface layers, to enhance durability and foil tearing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is formed on the thermal transfer image using conventional materials, then durability (abrasion resistance, solvent resistance) is improved, but foil tearing property deteriorates
Solution Approach 1:
The patent changes the glass transition temperature parameter of the protective layer resin to above 80°C, which fundamentally alters the material's thermal and mechanical properties. This parameter change enables the protective layer to maintain both high durability and excellent foil tearing property during the transfer process, resolving the trade-off between these two characteristics.
Solution Approach 2:
The patent uses composite resin systems including acrylic polyol resin, polyester polyurethane resin, and polyvinyl alcohol resin in specific combinations. These composite materials provide synergistic effects where the protective layer achieves enhanced durability through cross-linking while maintaining transferability and foil tearing through controlled glass transition temperature and molecular structure.
2Reliability
If the protective layer thickness is increased to improve durability, then durability is improved, but transferability and foil tearing property deteriorate
Solution Approach 1:
By controlling the glass transition temperature parameter above 80°C and adjusting the resin composition ratios, the patent enables thin protective layers to achieve high durability without compromising transferability. The optimized molecular structure allows adequate protection even at reduced thicknesses.
Solution Approach 2:
The composite resin system with specific components (acrylic polyol, polyester polyurethane, polyvinyl alcohol) in controlled ratios provides enhanced durability per unit thickness. This allows the protective layer to achieve required durability with thinner application, maintaining excellent transferability and foil tearing property.
3Reliability
If a protective layer is formed to provide chemical durability (plasticizer resistance, solvent resistance), then chemical durability is improved, but physical durability and foil tearing property may be compromised
Solution Approach 1:
The patent employs a composite resin system where polyvinyl alcohol resin (30-80 parts) provides chemical durability through plasticizer resistance and solvent resistance, while acrylic polyol resin (10-50 parts) and polyester polyurethane resin (10-50 parts) contribute to physical durability and cohesive strength. The synergistic combination ensures both chemical and physical durability are achieved simultaneously.
Solution Approach 2:
By controlling the glass transition temperature above 80°C and adjusting the resin composition ratios, the patent optimizes the balance between chemical durability (from polyvinyl alcohol's plasticizer resistance) and physical durability (from the cross-linked network structure), ensuring both aspects are satisfied without compromise.
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 effectively imparts both physical and chemical durability to thermal transfer images while maintaining excellent foil tearing properties, allowing for high-quality image transfer without compromising durability.
Implementation Method 1
a protective layer containing an acrylic polyol resin with a glass transition temperature above 80°C or a polyester polyurethane resin with a glass transition temperature above 50°C
Implementation Method 2
the protective layer is transferred onto the receiving layer by using a thermal head or heating roll or the like
Data Source
Figure 1~3
AI summary
The purpose is to provide a protective layer transfer sheet and an intermediate transfer medium, in which a transfer layer has excellent foil tearing property during transfer and in which sufficient durability can be imparted to the thermally transferred image. The above problem is solved by a protective layer transfer sheet (100) in which a transfer layer (20) is provided on one surface of a substrate (1) so as to be peelable from the substrate (1), wherein the transfer layer (20) comprises a peeling layer (2) and a protective layer (3) which are layered in this order from the substrate; wherein the protective layer (3) includes an acrylic polyol resin having a glass transition temperature (Tg) of more than 80°C or a polyester polyurethane resin having a glass transition temperature (Tg) of not less than 50 °C; and wherein the peeling layer includes at least one selected from a group consisting of polyester resins, acrylic urethane resins, and epoxy resins.