Siloxane Compound for Polyimide Adhesion and Stress Reduction
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Solution Overview
Problem
Current adhesion promoters for polyimide films on glass or metal substrates can introduce foreign substances and require additional coating steps, leading to economic inefficiencies and poor surface smoothness, while direct addition to polyamic acid can cause salt precipitation, compromising adhesion and appearance.
Innovation Solution
A novel siloxane compound with a specific structure that is non-reactive with polyamic acid is introduced into a polyimide precursor composition, improving storage stability and adhesion to inorganic substrates without altering the polyimide film's mechanical properties or appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesion promoter such as a silane compound is applied to the surface to improve adhesive force, then adhesive force between polyimide film and substrate is improved, but foreign substances are generated and surface smoothness deteriorates
Solution Approach 1:
The patent introduces a siloxane compound as an intermediary substance that is incorporated into the polyimide precursor composition itself. This siloxane compound acts as a mediator that enhances adhesion between the polyimide film and substrate without requiring separate surface application, thereby avoiding foreign substance contamination and maintaining surface smoothness while improving adhesive force.
Solution Approach 2:
The patent merges the adhesion promoter function with the polyimide precursor composition by incorporating the siloxane compound directly into the precursor solution. This combination eliminates the need for separate adhesion promoter application steps, preventing foreign substance generation and maintaining surface quality while achieving improved adhesion.
2Strength
If adhesion promoter is applied separately to improve adhesive force, then adhesive force is improved, but process complexity and production time increase
Solution Approach 1:
The patent combines the adhesion promoter (siloxane compound) with the polyimide precursor composition into a single integrated formulation. This merging of functions eliminates separate application steps, reduces process complexity, and improves productivity while maintaining enhanced adhesion performance.
Solution Approach 2:
The siloxane compound serves multiple functions simultaneously: it acts as both an adhesion promoter and a component of the polyimide precursor composition. This multi-functionality reduces the number of separate materials and processes needed, simplifying the overall manufacturing process while achieving improved adhesion.
3Strength
If adhesion promoter is directly added to polyamic acid to improve adhesive force, then adhesive force is improved, but salt precipitation occurs and appearance characteristics deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the adhesion promoter by using a siloxane compound with specific molecular structure and properties that are compatible with polyamic acid. This parameter change prevents salt precipitation and maintains appearance characteristics while still achieving improved adhesion force.
Solution Approach 2:
The siloxane compound acts as a chemically compatible intermediary between the polyamic acid and the substrate. Its specific molecular structure allows it to enhance adhesion without reacting to form precipitates, thereby maintaining the clarity and appearance characteristics of the polyimide film.
Data Source
AI summary
The present invention provides a siloxane compound having a novel structure, the compound not being reactive with a polyamic acid which is a polyimide precursor. In addition, provided is a polyimide precursor composition having improved storage stability by adding the siloxane compound as an enhancer for adhesion between a polyimide and a substrate made of an inorganic material. According to the present invention, provided is a multifunctional polyimide film having improved adhesiveness with a substrate made of an inorganic material while having improved optically isotropic characteristics and reduced residual stress characteristics with respect to a substrate.