Thermosensitive Recording Material Back Layer Adhesion
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Solution Overview
Problem
Thermosensitive recording materials with polypropylene film supports face issues with weak adhesion between the antistatic layer and the support, leading to peeling off when exposed to water or friction, especially when used as labels with release paper, and suffer from blocking problems when wound up.
Innovation Solution
A thermosensitive recording material with a polypropylene film support, featuring a back layer composed of a self-crosslinking resin emulsion and a quaternary ammonium polymer antistatic agent, which enhances antistatic properties without compromising adhesion, and includes a styrene-methacrylic acid copolymer filler for improved binding and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an antistatic layer is applied onto the back side of a thermosensitive recording material to prevent static electricity generation, then the antistatic property is improved, but the adhesion between the antistatic layer and the support deteriorates, causing the layer to peel off easily
Solution Approach 1:
The patent uses a composite material consisting of a polypropylene film support and a polyurethane resin adhesive layer. The polyurethane resin provides both strong adhesion to the support and antistatic functionality, creating a composite structure that simultaneously achieves good adhesion and antistatic property without the layer peeling off.
2Productivity
If a thermosensitive recording material is wound up for storage or transport, then productivity and ease of handling are improved, but blocking occurs between layers causing the coated layer to peel off
Solution Approach 1:
The patent employs a flexible polypropylene film support with a specifically designed back layer structure that prevents blocking during wound-up storage. The polyurethane resin adhesive layer with controlled properties allows the material to be wound without causing blocking, while maintaining layer integrity through its adhesive characteristics.
3Reliability
If water-resistant adhesive is used to improve water resistance, then water resistance is improved, but adhesion to the support deteriorates, especially when water penetrates into the adhesion surface
Solution Approach 1:
The patent optimizes the parameters of the polyurethane resin adhesive layer, including its composition and properties, to achieve a balance between water resistance and adhesion. By carefully controlling the adhesive layer's characteristics, the patent maintains strong adhesion to the polypropylene film support while providing sufficient water resistance for label applications.
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 strong adhesion to the support, preventing peeling even when water penetrates and maintains antistatic functionality, eliminating blocking issues during winding, thus ensuring reliable performance as labels.
Implementation Method 1
an antistatic agent has commonly been applied onto the back side of a thermosensitive recording material, the surface to be contacted with platen rolls... a quaternary ammonium polymer antistatic agent
Implementation Method 2
a back layer, wherein the thermosensitive recording layer and the protective layer are disposed on a surface of the polypropylene film support, and the back layer is disposed on another surface of the polypropylene film support... a self-crosslinking resin emulsion
Data Source
AI summary
A thermosensitive recording material including a polypropylene film support, a thermosensitive recording layer, a protective layer and a back layer, where the thermosensitive recording layer and the protective layer are disposed on a surface of the polypropylene film support, and the back layer is disposed on another surface of the polypropylene film support, where the back layer is a coated layer of a coating liquid containing a self-crosslinking resin emulsion, which contains a combination of at least one selected from a carbonyl group-containing acrylic resin having a Tg of 16° C. or lower and a copolymer polyester resin having a Tg of 16° C. or lower and a hydrazine derivative having a hydrazine residual group, and a quaternary ammonium polymer antistatic agent.