Pressure-Sensitive Adhesive Sheet With Light-Triggered Easy Peel
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Solution Overview
Problem
Conventional pressure-sensitive adhesive materials struggle with insufficient easy peel properties despite achieving high adhesion, leading to potential damage during the peeling process, especially with the use of azo or tetrazole compounds.
Innovation Solution
A gas generating agent that localizes on the surface upon light irradiation, generating a gas to facilitate easy peeling, with a maximum molar absorption coefficient of 7000 or more at 240-450 nm, incorporated into a pressure-sensitive adhesive composition and sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional pressure-sensitive adhesive materials (azo or tetrazole compounds) are used to achieve high adhesion, then adhesion strength is improved, but easy peel properties deteriorate
Solution Approach 1:
The pressure-sensitive adhesive material is segmented into multiple functional layers: a base adhesive layer providing strong adhesion, and a gas-generating layer containing azo compound or tetrazole compound that generates gas bubbles upon light irradiation to facilitate peeling. This segmentation allows the material to exhibit both high adhesion strength and easy peel properties through different layers performing different functions.
Solution Approach 2:
The gas-generating agents (azo compounds or tetrazole compounds) are pre-incorporated into the pressure-sensitive adhesive material during manufacturing. When light irradiation is applied during the peeling process, these pre-positioned agents rapidly generate gas bubbles at the adhesive-adherend interface, creating immediate separation force that enables easy peeling without requiring additional processing steps.
2Ease of operation
If gas generating agents are added to improve easy peel properties, then peeling becomes easier, but the amount of compound needed increases
Solution Approach 1:
The invention optimizes the concentration parameters of gas-generating agents within specific ranges (azo compounds: 0.1-10 wt%, tetrazole compounds: 0.01-5 wt%) to achieve effective gas generation with minimal compound amounts. Additionally, the molecular structure parameters of the compounds are optimized to maximize gas generation efficiency per unit mass, thereby reducing the total quantity needed while maintaining effective easy peel properties.
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 agent enhances easy peel properties while maintaining sufficient adhesion, reducing the load on adherends during peeling and preventing damage.
Implementation Method 1
a gas generating agent which generates a gas by light irradiation and which has a maximum molar absorption coefficient value of 7000 or more at a wavelength of 240 nm to 450 nm
Implementation Method 2
generates a gas by light irradiation
Data Source
AI summary
A gas generating agent which generates a gas by light irradiation, which has a maximum molar absorption coefficient value of 7000 or more at a wavelength of 240 nm to 450 nm, and which contains a gas generating moiety having a specific structure and an organopolysiloxane group or a fluorinated aliphatic hydrocarbon group in which a number of carbon atoms to which a fluorine atom is directly bound is from 2 to 8 and which optionally contains an ether bond (—O—) in a carbon chain.