Heat-Sensitive Recording Material Undercoat Layer
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Solution Overview
Problem
Heat-sensitive recording materials face challenges in achieving high-quality, clear images with few defects and high sensitivity, particularly in medium energy development density, due to the lack of specification on cushioning properties which significantly impact image quality.
Innovation Solution
The formation of a heat-sensitive recording material with an undercoat layer containing hollow plastic particles and a binder, resulting in an elastic modulus of 200 N/mm2 or less, which enhances cushioning properties and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an elastic layer is formed between support and heat-sensitive coloring layer to improve image clarity and dot reproducibility, then image quality is improved, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the recording material into distinct functional layers: support, undercoat layer containing hollow plastic particles, heat-sensitive recording layer, and protective layer. This segmentation allows each layer to perform its specific function independently, with the undercoat layer providing cushioning to improve image quality without complicating the entire structure.
Solution Approach 2:
The undercoat layer incorporates hollow plastic particles that create a porous, cushioning structure. These hollow particles provide elastic deformation capability to improve dot reproducibility and image clarity while maintaining a relatively simple layered structure that is feasible to manufacture.
2Manufacturing precision
If the hardness of the recording material is reduced to 90 or less to improve dot reproducibility, then image clarity is improved, but the strength and durability of the material decrease
Solution Approach 1:
The patent applies local quality by creating an undercoat layer with specific cushioning properties (elastic modulus of 0.01 to 0.5 MPa) between the rigid support and the heat-sensitive recording layer. This localized softness improves dot reproducibility in the recording layer without compromising the overall structural strength provided by the support and other layers.
Solution Approach 2:
The undercoat layer is formed as a composite material containing hollow plastic particles dispersed in a binder resin matrix. This composite structure provides the desired low elastic modulus for cushioning while maintaining adequate mechanical strength through the binder resin framework.
3Reliability
If hollow plastic particles are added to the undercoat layer to reduce elastic modulus and improve cushioning properties, then image quality and sensitivity are improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent specifies precise parameter ranges for the hollow plastic particles (average diameter 3-20 μm, elastic modulus 0.01-0.5 MPa, hollow ratio 50-90%) and their content in the undercoat layer (1-50 parts by mass per 100 parts binder resin). By controlling these parameters, the patent achieves optimal cushioning properties for high-quality imaging while maintaining manufacturability through standardized particle specifications.
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 high-quality, clear printed images with reduced image defects and improved medium energy development density, achieving high sensitivity and enhanced recording performance.
Implementation Method 1
the undercoat layer containing hollow plastic particles and a binder, the heat-sensitive recording layer containing a leuco dye and a developer, and the heat-sensitive recording material having an elastic modulus of 200 N/mm2 or less as measured by a nanoindentation method
Implementation Method 2
Heat-sensitive recording materials are widely known, which make use of a color-forming reaction of a leuco dye with a developer, which comes into contact with the leuco dye when heated to develop the color of the leuco dye, so that both coloring materials are melted and brought into contact with each other by heating, thus producing a color image
Data Source
AI summary
Disclosed is a heat-sensitive recording material comprising an undercoat layer and a heat-sensitive recording layer formed in this order on a support, the undercoat layer containing hollow plastic particles and a binder, the heat-sensitive recording layer containing a leuco dye and a developer, and the heat-sensitive recording material having an elastic modulus of 200 N/mm2 or less as measured by a nanoindentation method.