PolyTHF Acrylate Adhesive Composition for Flexible Impact-Resistant Bonding
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Solution Overview
Problem
Pressure-sensitive adhesives used in electronic devices face challenges in maintaining adhesion under deformation, traumatic forces, and extreme environmental conditions, necessitating improved impact resistance and flexibility to prevent delamination and ensure strong bonding.
Innovation Solution
An adhesive composition comprising two polymeric materials, a first (meth)acrylate polymer with a weight average molecular weight of at least 300,000 Daltons, and a crosslinked second (meth)acrylate polymer derived from a polymerizable composition including alkyl (meth)acrylate, a polar monomer, a poly(tetrahydrofuran) (meth)acrylate macromer, and a crosslinking monomer, providing enhanced peel strength and shear strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional pressure-sensitive adhesives are used, then basic adhesion is achieved, but impact resistance and flexibility are insufficient under deformation and traumatic forces
Solution Approach 1:
The adhesive composition uses a composite system combining a polyacrylate polymer (providing flexibility and compliance) with a polyether polymer containing tetrahydrofuran units (providing impact resistance and energy dissipation). This composite material approach allows the adhesive to simultaneously achieve both flexibility and high impact resistance, resolving the contradiction between basic adhesion and impact resistance under deformation conditions
2Strength
If adhesive strength is increased to prevent delamination, then bonding strength is improved, but flexibility and compliance under deformation are reduced
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive by incorporating polyether polymers with specific tetrahowrnan units that provide both high peel strength and exceptional flexibility. The polymer structure parameters are optimized to maintain strong adhesion while enabling the adhesive to accommodate deformation and bending, thus resolving the contradiction between peel strength and flexibility
3Ease of manufacture
If adhesive composition is simplified, then manufacturing ease is improved, but performance under extreme conditions deteriorates
Solution Approach 1:
The adhesive formulation incorporates specific functional polymer components with localized properties: the polyacrylate provides baseline adhesive characteristics while the polyether polymer with tetrahowrnan units provides specialized performance under extreme conditions including temperature variation and impact. This targeted inclusion of specific polymer components maintains manufacturing simplicity while dramatically improving reliability under extreme environmental conditions
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 composition demonstrates improved impact resistance, flexibility, and adherence under dynamic deformations, ensuring strong bonding in electronic devices despite external forces and environmental stress.
Implementation Method 1
a crosslinked second (meth)acrylate polymer that is a polymerized product of a second polymerizable composition including (1) an alkyl (meth)acrylate, (2) a polar monomer, (3) a poly(tetrahowfuran) (meth)acrylate macromer, and (4) a crosslinking monomer
Data Source
AI summary
An adhesive composition that contains two polymeric materials, a method of making the adhesive composition, and an article that contains the adhesive composition are provided. One of the polymeric materials is derived from a (meth)acrylate macromer having a poly(tetrahydrofuran) group. The articles include a layer of the adhesive composition positioned next to a substrate. The articles can be, for example, an adhesive tape or can be part of another article such as, for example, an electronic device that is impact resistant and/or flexible.