Linerless Label Thermosensitive Medium With Non-Silicone Release Layer
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Solution Overview
Problem
Linerless labels face challenges in achieving excellent releasability, oil resistance, and printing operability due to the use of non-silicone release agents that hinder heat transmission to the thermosensitive recording layer, affecting coloring performance.
Innovation Solution
A thermosensitive recording medium for linerless labels comprising a support, a thermosensitive recording layer, a protective layer, and a release layer, where the release layer includes epichlorohydrin, polyamide epichlorohydrin, an oxazoline derivative, hydrazine, or a hydrazide derivative, enhancing adhesion between the protective and release layers to improve printing operability and oil resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-silicone release agent is used in the release layer, then releasability is improved, but heat transmission to the thermosensitive recording layer is hindered, lowering coloring performance
Solution Approach 1:
The patent changes the chemical composition parameters of the release layer by incorporating specific compounds (epichlorohydrin, polyamide epichlorohydrin, oxazoline derivatives, hydrazine, or hydrazide derivatives) that modify the thermal and adhesive properties. This allows optimization of both releasability and heat transmission by adjusting the molecular structure and composition ratios of the release agent
Solution Approach 2:
The patent creates a composite release layer by combining non-silicone release agents with specific chemical compounds that enhance heat transmission. This composite structure maintains the low adhesion properties of non-silicone agents while introducing components that improve thermal conductivity to the thermosensitive recording layer
2Reliability
If a large deposition amount of non-silicone release agent is used, then releasability is improved, but heat applied from thermal head is not readily transmitted, lowering coloring performance
Solution Approach 1:
The patent changes the quality parameters of the release agent by selecting specific chemical compounds with optimized molecular weights and thermal properties. This allows achieving effective releasability with reduced deposition amounts, as the selected compounds (epichlorohydrin, polyamide epichlorohydrin, etc.) provide high release performance at lower concentrations
Solution Approach 2:
The patent adopts the functional properties of silicone-based release agents (which have good heat transmission) by creating a non-silicone alternative that copies the essential performance characteristics. The selected compounds replicate the balance between releasability and thermal conductivity without using silicone chemistry
3Object-affected harmful factors
If non-silicone release agent is used for food safety, then safety is improved, but oil resistance is poor compared to UV-curable or thermally crosslinking silicone
Solution Approach 1:
The patent modifies the chemical parameters of the release layer by selecting compounds with specific functional groups (epichlorohydrin, oxazoline, hydrazine) that provide both food safety and enhanced oil resistance. These compounds can be crosslinked or modified to create a more oil-resistant structure while maintaining non-silicone composition for food contact safety
Solution Approach 2:
The patent creates a composite release layer that combines food-safe non-silicone agents with crosslinking agents or modifiers. This composite structure provides oil resistance comparable to silicone-based systems while maintaining the food safety advantages of non-silicone composition, suitable for food packaging applications
Data Source
AI summary
A thermosensitive recording medium for a linerless label is provided. The thermosensitive recording medium includes a support, a thermosensitive recording layer, a protective layer, and a release layer. The release layer includes at least one selected from the group consisting of epichlorohydrin, polyamide epichlorohydrin, an oxazoline derivative, hydrazine, and a hydrazide derivative. The thermosensitive recording layer, the protective layer, and the release layer are disposed on one side of the support.