Photothermal Adhesive Sheet for Multi-Wavelength Component Release
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Solution Overview
Problem
Existing adhesive technologies for temporarily fixing electronic components require specific wavelength-dependent laser light for separation, complicating the production process.
Innovation Solution
A pressure-sensitive adhesive sheet with a laminated structure of first and second photothermal conversion layers and a pressure-sensitive adhesive layer, allowing peelability through light irradiation, with transmittance optimized for a wide range of wavelengths, including UV and near-infrared, and incorporating specific resins and absorbers for heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid adhesive containing carbon black powder as a photothermal conversion material is used, then the workpiece can be firmly fixed and easily separated by laser irradiation, but the wavelength of the laser light must be changed in accordance with the photothermal conversion material, making the production process complicated
Solution Approach 1:
The patent uses a composite pressure-sensitive adhesive sheet comprising a base material and a photothermal conversion layer containing carbon black powder. This composite structure allows the adhesive to function with a fixed photothermal conversion material while maintaining reliable fixation and separation capabilities, eliminating the need to change laser wavelengths for different materials.
Solution Approach 2:
The patent optimizes the transmittance parameters of the pressure-sensitive adhesive sheet to be 75% or less at 1,032 nm wavelength and 50% or less at 355 nm wavelength. By fixing these transmittance parameters, the adhesive sheet can be used with standard laser wavelengths without requiring wavelength changes, thereby simplifying the production process while maintaining reliable fixation.
2Adaptability or versatility
If the transmittance of the pressure-sensitive adhesive sheet is optimized for a wide range of wavelengths, then flexibility in light selection is improved and visibility is maintained, but the adhesive strength and heat resistance must be ensured simultaneously
Solution Approach 1:
The patent creates a composite structure where a photothermal conversion layer containing carbon black powder is combined with a base material. This composite allows the adhesive sheet to maintain both optical properties (transmittance control for visibility and light absorption capability) and mechanical properties (adhesive strength and heat resistance) simultaneously.
Solution Approach 2:
The patent applies different properties to different layers: the photothermal conversion layer provides light absorption and transmittance control, while the base material provides adhesive strength and heat resistance. This local differentiation of functions allows the overall structure to achieve both optical versatility and mechanical reliability.
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
Enables easy separation of electronic components by light irradiation, offering flexibility in light selection and maintaining visibility, while ensuring high adhesive strength and heat resistance.
Implementation Method 1
thermal decomposition of the photothermal conversion layer through absorption of the light and conversion of the light into heat
Data Source
AI summary
Provided is a pressure-sensitive adhesive sheet for temporarily fixing an electronic part that shows peelability by irradiation with light, the pressure-sensitive adhesive sheet for temporarily fixing an electronic part having a wide range of selection of the light to be applied. The pressure-sensitive adhesive sheet for temporarily fixing an electronic part of the present invention includes: a laminated structure A including a first photothermal conversion layer and a second photothermal conversion layer arranged on at least one side of the first photothermal conversion layer; and a pressure-sensitive adhesive layer arranged on at least one side of the laminated structure A. The pressure-sensitive adhesive sheet has a transmittance for light having a wavelength of 1,032 nm of 75% or less, and has a transmittance for light having a wavelength of 355 nm of 50% or less.