Acrylic PSA Sheet with Rust Inhibitor for Metal Corrosion and Impact Resistance
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Solution Overview
Problem
Conventional pressure-sensitive adhesive (PSA) sheets used for fixing members with metal surfaces, particularly in mobile electronic devices, face challenges in providing both effective metal corrosion prevention and sufficient impact resistance while maintaining a low relative dielectric constant.
Innovation Solution
A PSA sheet with a layer comprising an acrylic polymer and a rust inhibitor, where the monomeric components include a (meth)acrylate with an alkyl group having 5 or more carbon atoms at 50% by weight or more, and optionally a carboxy group-containing monomer, tackifier resin, and crosslinking agents, to achieve a relative dielectric constant of 3 or less and enhanced shear impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional PSA sheet uses a base polymer with no carboxy group-containing monomer to prevent metal corrosion, then metal corrosion prevention is improved, but member holding performance (impact resistance) deteriorates
Solution Approach 1:
The invention separates the corrosion prevention function from the structural polymer matrix by introducing a dedicated rust inhibitor component (0.1-10 parts by weight per 100 parts base polymer). This allows the base polymer to focus on providing mechanical strength and adhesion, while the rust inhibitor specifically addresses corrosion protection, resolving the contradiction between corrosion prevention and member holding performance
Solution Approach 2:
The rust inhibitor acts as an intermediary substance between the PSA layer and the metal surface. It provides corrosion protection without requiring the base polymer itself to contain carboxy groups, thereby maintaining the polymer's structural integrity and impact resistance while still preventing metal corrosion
2Reliability
If the relative dielectric constant of the PSA layer is lowered, then signal integrity is improved, but member holding performance (impact resistance) deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the base polymer by specifying monomer ratios: 50% or more of (meth)acrylate with alkyl groups having 5 or more carbon atoms. This compositional parameter change achieves a low relative dielectric constant (3.0 or less) while the carboxy group-containing monomer (5-50% by weight) maintains impact resistance through enhanced molecular crosslinking and cohesion
3Strength
If a PSA sheet uses carboxy group-containing monomer to improve shear impact resistance, then member holding performance is improved, but metal corrosion risk increases
Solution Approach 1:
The rust inhibitor serves as an intermediary protective layer between the carboxy group-containing monomer in the PSA and the metal surface. It neutralizes the potential corrosive effect of carboxy groups while allowing the monomer to provide its beneficial impact resistance and adhesion properties
Solution Approach 2:
The invention extracts the corrosion prevention function from the base polymer structure and assigns it to a separate rust inhibitor component. This allows the base polymer to freely use carboxy group-containing monomers for improving strength and adhesion without directly contacting the metal surface in a corrosive manner
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 PSA sheet effectively prevents metal corrosion, exhibits excellent member holding performance, and provides improved impact resistance, making it suitable for fixing pressure-sensitive sensors in mobile electronic devices without impairing signal integrity.
Implementation Method 1
a PSA layer comprising a base polymer and a rust inhibitor. The base polymer is an acrylic polymer
Implementation Method 2
the PSA layer includes a rust inhibitor, the member holding performance and the metal corrosion preventing property can be advantageously achieved at the same time
Data Source
AI summary
Provided is a pressure-sensitive adhesive (PSA) sheet having a low relative dielectric constant, satisfactory metal corrosion preventing property, and excellent member holding performance. The present invention provides a PSA sheet having a PSA layer including a base polymer and a rust inhibitor. The base polymer is an acrylic polymer, and monomeric components constituting the acrylic polymer comprise a (meth)acrylate having an alkyl group having 5 or more carbon atoms at an ester end at 50% by weight or more of the monomeric components. The PSA layer has a relative dielectric constant of 3 or less at 300 kHz.