Thermosensitive Recording Material Adhesion at -20°C
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Solution Overview
Problem
Thermosensitive recording materials face issues with peeling of the recording layer when exposed to mechanical external forces in freezing environments, leading to readability failures and adhesion problems due to weak adhesion between layers, especially between the support and the under layer.
Innovation Solution
A thermosensitive recording material structure comprising a support with an under layer containing a binder resin with acrylic resin and polyvinyl alcohol, and nonfoamable hollow particles, along with a thermosensitive recording layer and protective layer, ensuring an adhesive force of 10.0 N/25 mm or greater at -20°C, which maintains layer integrity under mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If synthetic paper or synthetic resin film is used as support, then size stability and physical strength are improved, but adhesion between support and under layer becomes weak
Solution Approach 1:
The patent introduces a specific under layer composition acting as an intermediary between the synthetic paper/support and the thermosensitive recording layer. This under layer contains a binder resin (acrylic resin with carboxyl group) and hollow particles, creating a transitional interface that improves adhesion to the support while maintaining the structural integrity provided by the synthetic paper base.
Solution Approach 2:
The patent employs composite materials in the under layer by combining binder resin (acrylic resin containing carboxyl group) with hollow particles. This composite structure enhances the adhesion properties of the under layer to the synthetic paper support, resolving the contradiction between maintaining physical strength and improving adhesion.
2Reliability
If thermosensitive recording material is stored in freezing environment with peeling, then adhesion weakness is exposed, but mechanical force causes recording layer peeling and reading failure
Solution Approach 1:
The patent applies beforehand cushioning by pre-configuring the under layer with specific adhesion-enhancing components (binder resin with carboxyl group and hollow particles) before the freezing environment exposure occurs. This preventive measure ensures that when mechanical force is applied in freezing conditions, the enhanced adhesion prevents recording layer peeling and maintains reading functionality.
3Reliability
If coating liquid penetration to synthetic paper is insufficient, then adhesion between layers becomes weak, but penetration to paper base is reduced
Solution Approach 1:
The patent applies local quality by concentrating adhesion-enhancing components (binder resin with carboxyl group and hollow particles) specifically in the under layer that contacts the synthetic paper support. This localized formulation ensures effective adhesion at the critical interface without requiring extensive penetration throughout the entire paper base, simplifying the coating process.
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 ensures high coloring sensitivity and image density while preventing peeling of the thermosensitive recording layer even under mechanical force in freezing conditions, ensuring reliable information visibility and functionality.
Implementation Method 1
the under layer contains a binder resin, and hollow particles, characterized in that the binder resin comprises an acrylic resin containing a carboxyl group and a polyvinyl alcohol containing a carboxyl group
Implementation Method 2
the hollow particles are nonfoamable hollow particles, each of which is composed of a shell of a thermoplastic resin, and air or another gas contained therein
Data Source
Figure 1
AI summary
To provide a thermosensitive recording material, containing: a support; an under layer; a thermosensitive recording layer; and a protective layer, where the under layer, the thermosensitive recording layer, and the protective layer are provided in this order on at least one surface of the support, wherein the support is synthetic paper, or a synthetic resin film, wherein the under layer contains a binder resin comprising a polyvinyl alcohol containing a carboxyl group, an acrylic resin and hollow particles, wherein an adhesive force of the thermosensitive recording material at -20°C, as measured by the described measuring method of the adhesive force, is 10.0 N/25 mm or greater.