Laminate Patchable to Living Body with Heat-Resistant Substrate
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Solution Overview
Problem
Pressure-sensitive adhesion sheets used in medical and sanitary applications deform when heated due to the transfer of carboxylic acid esters from the adhesive layer to the film, leading to loss of shape and functionality.
Innovation Solution
A laminate patchable to a living body is developed with a pressure-sensitive adhesive layer containing a first carboxylic acid ester and a substrate layer containing a second carboxylic acid ester, where the substrate layer's composition suppresses the transfer of the first carboxylic acid ester, enhancing heat resistance and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pressure-sensitive adhesion sheet uses a film with carboxylic acid ester to enable easy peeling from skin, then peeling ease is improved, but heat resistance deteriorates causing film deformation
Solution Approach 1:
The invention divides the adhesion sheet into distinct functional layers: a pressure-sensitive adhesive layer containing the first carboxylic acid ester for peeling ease, and a substrate layer containing the second carboxylic acid ester for heat resistance. This segmentation allows each layer to independently fulfill its specific function without compromising the other.
Solution Approach 2:
The invention creates a composite structure by combining the pressure-sensitive adhesive layer and substrate layer, where the substrate layer acts as a heat-resistant support that prevents the adhesive layer from deforming at high temperatures, while still allowing easy peeling through the adhesive layer's carboxylic acid ester content.
2Temperature
If the substrate layer contains high content of second carboxylic acid ester to suppress transfer, then heat resistance is improved, but bleeding of substrate layer occurs
Solution Approach 1:
The invention optimizes the content ratio of the second carboxylic acid ester in the substrate layer to a specific range (0.1-10% by mass relative to the first carboxylic acid ester in the adhesive layer). This parameter optimization ensures sufficient heat resistance while preventing excessive substrate layer bleeding that would cause contamination and sticking issues.
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 laminate patchable to a living body exhibits excellent heat resistance, preventing deformation and maintaining shape integrity even when heated, while also reducing skin irritation and bleeding of the substrate layer.
Implementation Method 1
the substrate layer contains a second carboxylic acid ester, so that when the laminate patchable to a living body is heated, a transfer of the first carboxylic acid ester from the pressure-sensitive adhesive layer to the substrate layer can be suppressed
Data Source
AI summary
A laminate patchable to a living body and that includes a pressure-sensitive adhesive layer for patching to the living body and a substrate layer disposed on a one-side surface in a thickness direction of the pressure-sensitive adhesive layer and supporting the pressure-sensitive adhesive layer. The pressure-sensitive adhesive layer contains a first carboxylic acid ester and the substrate layer contains a second carboxylic acid ester.