Thermal Transfer Sheet Colored Layer Resin Composition
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Solution Overview
Problem
Conventional thermal transfer sheets lack adequate adhesiveness and resistance to organic solvents, leading to issues like tailing and erasure of printed images when exposed to solvents.
Innovation Solution
A thermal transfer sheet comprising a substrate, a colored layer with high and low molecular weight polyester-based resins at a specific ratio, and an adhesion layer with a polyester-based resin, enhancing adhesiveness and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional adhesion layer is used, then the structure is simple, but the adhesiveness to the material and resistance to organic solvents are insufficient
Solution Approach 1:
The colored layer uses a composite resin system comprising polyester-based resin (Mn: 15,000-30,000) and acrylic-based resin (Mn: 2,000-10,000) in a weight ratio of 95:5 to 50:50. This composite material approach provides both high adhesiveness to the material and excellent resistance to organic solvents, resolving the contradiction between reliability and complexity by incorporating multiple resin components with complementary properties
Solution Approach 2:
The invention specifies precise parameter ranges for the molecular weights of the resins (polyester-based resin Mn: 15,000-30,000 and acrylic-based resin Mn: 2,000-10,000) and their weight ratio (95:5 to 50:50). By optimizing these parameters, the colored layer achieves adequate adhesiveness and solvent resistance without requiring complex structural modifications
2Manufacturing precision
If the colored layer uses single resin type, then the composition is simple, but the printability for fine lines and resistance to tailing are insufficient
Solution Approach 1:
The colored layer employs a composite resin system with polyester-based resin (Mn: 15,000-30,000) providing structural integrity and acrylic-based resin (Mn: 2,000-10,000) providing flow characteristics. This composite approach enables excellent fine line printability and prevents tailing by balancing the rigidity and flexibility properties of the two resin types
Solution Approach 2:
The invention creates different functional zones within the colored layer through the use of resins with different molecular weights. The higher molecular weight polyester-based resin provides structural stability for fine line definition, while the lower molecular weight acrylic-based resin ensures proper flow and bonding characteristics, achieving local functional differentiation
3Reliability
If gaps exist between layers, then the manufacturing is easier, but the resistance to organic solvents deteriorates
Solution Approach 1:
The invention optimizes the molecular weight parameters of the resins to achieve adequate viscosity and flow characteristics during the manufacturing process. This ensures close contact between the colored layer and adhesion layer without requiring complex pressure application or vacuum techniques, thereby maintaining solvent resistance while preserving ease of manufacture
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 improved printability for fine lines and prevents transfer failures like tailing, while maintaining resistance to organic solvents, ensuring the durability and clarity of printed images.
Implementation Method 1
the adhesion layer contains a polyester-based resin whose glass transition temperature is not less than 70° C. and not more than 80° C.
Implementation Method 2
the colored layer contains a colorant, polyester-based resin A, and polyester-based resin B
Implementation Method 3
The colored layer is transferred onto a material on which a print is to be applied such as paper or a plastic sheet by applying energy depending on image information using a heating device such as a thermal head
Implementation Method 4
a thermal transfer sheet that is carried a colored layer obtained by dispersing a colorant such as a pigment or a dye in wax or a resin
Data Source
AI summary
The thermal transfer sheet according to the present invention that has, in the order mentioned, a substrate, a colored layer, and an adhesion layer; and wherein the colored layer contains a colorant, polyester-based resin A, and polyester-based resin B; the number average molecular weight of the polyester-based resin A is not less than 15,000; the number average molecular weight of the polyester-based resin B is not more than 5,000; a content ratio by mass of the polyester-based resin A to the polyester-based resin B (polyester-based resin A/polyester-based resin B) in the colored layer is not less than 2/3 and not more than 9/1; and the adhesion layer includes a polyester-based resin.