Fluorene Polyimide Adhesion Promoter for Flexible Displays
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Solution Overview
Problem
Conventional adhesion promoters for polyimide resins often result in foreign substances and require additional coating processes, leading to economic inefficiencies and reduced mechanical properties, while direct addition to polyamic acid can cause salt formation and decreased adhesiveness.
Innovation Solution
A novel compound with a fluorene skeleton is used as an adhesion promoter, which reacts with acid dianhydride and diamine to form a polyimide copolymer, ensuring strong adhesion without increasing retardation or affecting heat resistance, and is uniformly distributed in the polyimide matrix to minimize residual stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesion promoter such as a silane compound is applied to the substrate surface, then adhesive force between polyimide film and substrate is improved, but the surface becomes rough and requires additional coating processes
Solution Approach 1:
The adhesion promoter function is merged into the polyimide resin itself by incorporating a silane-containing compound into the polyimide copolymer structure. This eliminates the need for separate adhesion promoter coating processes while maintaining the dual benefits of improved adhesion and smooth surface finish.
Solution Approach 2:
The polyimide resin contains built-in adhesion promoter functionality through the incorporated silane compound. The resin automatically provides adhesion enhancement without requiring external adhesion promoter applications, making the system self-sufficient.
2Strength
If an adhesion promoter is applied to improve adhesive force, then adhesion is enhanced, but a smooth surface cannot be obtained
Solution Approach 1:
The adhesion promoter functionality is integrated into the polyimide resin structure itself through incorporation of silane-containing compounds. This eliminates the need for separate adhesion promoter coatings that would create surface roughness, while maintaining smooth surface finish and improved adhesion simultaneously.
3Strength
If an amino group of silane compound reacts with carboxylic group of polyamic acid, then adhesion promoter is formed, but foreign substances are generated on substrate
Solution Approach 1:
The chemical structure parameters of the adhesion promoter are modified by selecting specific silane compounds with controlled molecular weights and structures. This optimization prevents excessive reaction with polyamic acid that would generate foreign substances, while maintaining effective adhesion promotion.
Solution Approach 2:
The silane-containing compound is incorporated at specific locations within the polyimide copolymer structure rather than being uniformly distributed or applied as a separate layer. This localized incorporation controls the reaction behavior and prevents foreign substance generation while maintaining adhesion enhancement.
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 novel adhesion promoter enhances the adhesive strength of polyimide films to carrier substrates, maintains heat resistance and mechanical properties, and reduces residual stress, resulting in a transparent, high-performance polyimide film suitable for flexible display substrates.
Implementation Method 1
reacts with acid dianhydride and diamine to form a polyimide copolymer
Implementation Method 2
an adhesion promoter which is a silane-containing compound
Data Source
AI summary
The present invention provides a novel polyimide resin adhesion enhancer having a fluorene framework, wherein a polyimide film produced using same exhibits conventional properties such as heat resistance and mechanical properties, and maintains adhesion with a carrier substrate while not being affected with respect to retardation even during a high-temperature process.