Polymer Getter Adhesive for Flexible Electronics
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Solution Overview
Problem
Existing adhesive compounds for encapsulating (opto)electronic devices face challenges in providing effective barrier properties against water vapor and oxygen, particularly in flexible organic electronics, due to limitations in adhesion, flexibility, and the use of volatile organic compounds, which can damage sensitive structures and complicate the application process.
Innovation Solution
A barrier adhesive compound comprising a multifunctionalized polymeric getter material with elastomers and reactive resins, featuring hydrolyzable silyl groups and cyclic ether groups, which enhances adhesion and penetration resistance while maintaining flexibility and ease of application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass or metal substrates are used for encapsulation, then permeation barrier properties are improved, but mechanical stress resistance deteriorates and device flexibility is reduced
Solution Approach 1:
The patent changes the material parameters by using polymer substrates with specific glass transition temperatures and molecular structures that provide both flexibility and barrier properties. The adhesive compound parameters are optimized to achieve low permeability while maintaining mechanical compliance with flexible substrates.
Solution Approach 2:
The patent employs composite adhesive compounds combining organic polymers with inorganic barrier layers or nanocomposites. This creates a multi-functional material that provides both the flexibility needed for organic electronics and the permeation barrier required for protection against water and oxygen.
2Ease of operation
If traditional adhesive compounds are used, then ease of application is maintained, but barrier properties against water vapor and oxygen deteriorate
Solution Approach 1:
The adhesive compound parameters are optimized to achieve low permeability while maintaining application simplicity. The formulation includes specific polymer combinations and additives that preserve ease of dispensing and bonding while providing enhanced barrier performance through controlled molecular structure and crosslinking density.
3Strength
If volatile organic compounds are used in adhesive formulations, then adhesion properties are improved, but damage to sensitive electronic structures occurs
Solution Approach 1:
The patent changes the chemical composition parameters by using non-volatile adhesion promoters and alternative chemistry systems that achieve strong bonding without releasing harmful volatile compounds. This includes using polymer-based adhesion mechanisms rather than solvent-based approaches.
4Reliability
If rigid encapsulation structures are used, then permeation barrier properties are improved, but device flexibility and pliancy deteriorate
Solution Approach 1:
The patent uses flexible polymer films and coatings as encapsulation structures that can bend and conform to flexible substrates while providing effective barrier properties. The film composition and thickness are optimized to balance flexibility with permeation resistance.
Solution Approach 2:
The patent employs composite structures combining flexible polymer matrices with inorganic barrier layers or molecularly engineered polymers that provide both mechanical flexibility and permeation barrier functionality in a single integrated system.
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 adhesive compound achieves high penetration times and effective barrier properties against water vapor, even at elevated temperatures, with improved adhesion and flexibility, reducing the risk of damage to electronic devices and simplifying the encapsulation process.
Implementation Method 1
the barrier adhesive compound comprises at least one polymer which contains at least two functional groups suitable for building a polymer and at least two hydrolyzable silyl groups
Implementation Method 2
Barrier adhesive mass with polymer getter material
Data Source
AI summary
The invention relates to a barrier adhesive mass having high breakthrough times for water and also providing a good adhesive performance. This is achieved by a barrier adhesive mass comprising at least one elastomer and at least one reactive resin, and is characterised in that the barrier adhesive mass comprises at least one polymer G containing at least two functions suitable for constructing a polymer, as well as at least two hydrolysable silyl groups. The invention also relates to an adhesive tape comprising a barrier adhesive mass according to the invention, and to the use of an adhesive mass of this type for sealing electronic assemblies.