Pressure-Sensitive Adhesive Sheet With Decomposable Aliphatic Polycarbonate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pressure sensitive adhesive sheets lack a reliable mechanism to reduce adhesive strength at desired timing, making it difficult to easily release adherends during manufacturing processes like cutting semiconductor wafers and ceramic green sheet laminates.
Innovation Solution
A pressure sensitive adhesive sheet comprising an aliphatic polycarbonate, a pressure sensitive adhesive resin, and an acid/base generator that decomposes upon energy application, reducing adhesive strength by generating carbon dioxide and altering the contact area with the adherend.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pressure sensitive adhesive sheet uses a conventional adhesive composition, then it maintains stable adhesive strength, but it cannot reduce adhesive strength at desired timing for easy release of adherends
Solution Approach 1:
The patent applies parameter changes by incorporating a decomposable component (aliphatic polycarbonate or thermally-expandable particles) that changes the adhesive layer's physical or chemical parameters in response to external stimuli (heat, moisture). This allows the adhesive strength to be dynamically adjusted: stable under normal conditions, but reducible when exposed to triggering conditions, enabling controlled release of adherends
Solution Approach 2:
The patent implements dynamics by creating an adhesive system that transitions from a static adhesive strength to a dynamic one. The decomposable component allows the adhesive properties to change over time or in response to environmental conditions, transforming the adhesive from a permanently strong bond to a controllable, reversible bond that can be deactivated when needed
2Ease of operation
If energy is applied to reduce adhesive strength, then adherend release becomes easy, but the process requires additional energy input and control complexity
Solution Approach 1:
The patent replaces mechanical or complex control systems with a chemical mechanism. Instead of using mechanical force, electrical control, or complex actuation systems to reduce adhesive strength, the invention uses a chemical decomposition reaction triggered by simple environmental conditions (heat, moisture), thereby reducing energy input and control complexity
Solution Approach 2:
The adhesive system performs self-service by automatically reducing its own adhesive strength through the decomposition of incorporated components. The aliphatic polycarbonate or thermally-expandable particles autonomously respond to triggering conditions and reduce adhesion without requiring external mechanical intervention or complex control systems
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 release of adherends by reducing adhesive strength at specific times through thermal decomposition, improving the handling and processing of electronic components without leaving residue.
Implementation Method 1
the aliphatic polycarbonate contained in the pressure sensitive adhesive composition decomposes while generating carbon dioxide by heat
Implementation Method 2
an acid/base generator that generates an acid or a base upon the application of energy
Data Source
AI summary
A pressure sensitive adhesive sheet is provided which comprises a pressure sensitive adhesive layer formed of a pressure sensitive adhesive composition. The pressure sensitive adhesive composition contains an aliphatic polycarbonate and a pressure sensitive adhesive resin other than the aliphatic polycarbonate. The pressure sensitive adhesive sheet can be reduced in the adhesive strength at desired timing by a novel mechanism of action so that the release of an adherend becomes easy. The above pressure sensitive adhesive composition preferably contains an acid/base generator that generates an acid or a base by applying energy.