Photocleavable Adhesive Composition for Low-Temperature Curing
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Solution Overview
Problem
Conventional heat-curable adhesive compositions used in semiconductor module production exhibit increased shear viscosity over time, limiting their usable period to about 3 weeks, and require a curing reaction at temperatures higher than 85°C, which is not suitable for modern semiconductor module processes.
Innovation Solution
A heat-curable adhesive composition containing a photocleavable compound that generates an amine compound upon irradiation, combined with a heat-curable resin, allows for low-temperature curing at 85°C or lower and suppresses viscosity increase during storage by irradiating the composition before use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a heat-curable adhesive composition is stored for an extended period, then the curing reaction progresses during storage, but the shear viscosity increases over time, limiting the usable period to about 3 weeks
Solution Approach 1:
A photocleavable compound is introduced as an intermediary substance that temporarily inhibits the curing reaction during storage. Upon UV irradiation, this compound decomposes to release a curing accelerator, which then triggers the heat-curable resin to cure. This mediator mechanism allows the adhesive to remain stable during storage while enabling controlled curing when needed, extending the usable period beyond 3 weeks.
2Temperature
If a curing accelerator is added to achieve low-temperature curability at 85°C or lower, then the curing reaction proceeds easily during storage, but the shear viscosity increases rapidly, reducing the work life to about 3 weeks
Solution Approach 1:
The photocleavable compound is pre-loaded into the adhesive composition during manufacturing, but its curing accelerator function is activated only after UV irradiation. This preliminary preparation allows the system to maintain low-temperature curability capability while preventing premature curing during storage, effectively extending the work life from 3 weeks to over 4 weeks.
3Reliability
If the adhesive composition is stored without protection, then the curing reaction progresses spontaneously, but the composition becomes unusable after a short period
Solution Approach 1:
The photocleavable compound acts as a preliminary protective agent that prevents spontaneous curing during storage. Upon UV irradiation, it decomposes to remove this protection and allow the curing reaction to proceed reliably. This preliminary anti-action mechanism ensures both storage stability and curing reliability, solving the contradiction between these two requirements.
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 composition maintains a long work life of over four weeks and enables effective thermal curing at low temperatures, ensuring reliable adhesion and bonding in semiconductor module production.
Implementation Method 1
a photocleavable compound that generates an amine compound through cleavage induced by irradiation
Implementation Method 2
a heat-curable resin that cures upon heating in the presence of the amine compound
Data Source
AI summary
A heat-curable adhesive composition containing: a photocleavable compound that generates an amine compound through cleavage induced by irradiation; and a heat-curable resin that cures upon heating in a presence of the amine compound. A layered film including: a substrate film; and an adhesive layer provided on a surface of the substrate film; wherein the adhesive layer is composed of the heat-curable adhesive composition.