Low Outgassing Solvent-Based PSA for Electronics
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Solution Overview
Problem
Conventional pressure-sensitive adhesives (PSAs) face challenges in achieving low outgassing, especially when used on electronic devices, as they can release volatile organic components (VOCs) at elevated temperatures, potentially leading to short circuits.
Innovation Solution
A solvent-based PSA formulation comprising a polymer with a vinyl acetate monomer, an acrylic ester monomer, and a monomer with hydroxyl or amine functionality, combined with a crosslinker, which has a glass transition temperature between -40°C and -10°C, and a weight average molecular weight of 25,000 to 400,000 g/mol, resulting in a low outgassing adhesive that releases less than 2000 ng/cm² according to ASTM E 595 (1993).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solvent-based pressure-sensitive adhesives are used, then excellent adhesion and tack are achieved, but high outgassing of volatile organic components occurs at elevated temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by incorporating specific polymers (polyvinyl acetate, acrylic ester, and hydroxyl/amine functional monomers) in controlled ratios, along with crosslinking agents. This compositional parameter change enables the adhesive to maintain strong bonding while significantly reducing VOC outgassing at elevated temperatures
Solution Approach 2:
The invention creates a composite adhesive system by combining multiple polymer types (vinyl acetate, acrylic ester, and functional monomers) with crosslinking agents. This composite structure achieves synergistic effects where the combination provides both excellent adhesion performance and low outgassing properties that individual components cannot achieve alone
2Object-generated harmful factors
If water-based pressure-sensitive adhesives are used, then outgassing is reduced, but adhesion and tack performance deteriorate
Solution Approach 1:
The patent changes the base solvent parameter from water to a controlled solvent system, allowing the use of organic solvents that enhance polymer compatibility and adhesion while limiting their quantity and selecting those with lower volatility. This parameter change enables solvent-based adhesives to achieve low outgassing while maintaining excellent adhesion
Solution Approach 2:
The invention applies local quality by using a multi-component polymer system where each polymer type contributes specific properties: polyvinyl acetate provides base adhesion, acrylic ester enhances flexibility and bonding, and hydroxyl/amine functional monomers provide crosslinking sites. This localized functional distribution within the adhesive matrix achieves both high performance and low outgassing
Data Source
AI summary
Provided herein is a solvent-based pressure sensitive adhesive comprising a polymer comprising a vinyl acetate monomer, an acrylic ester monomer, and a monomer having hydroxyl or amine functionality. The adhesive also comprise a crosslinker. The coated and dried adhesive has outgassing of less than 2000 ng/cm2, even when applied to an electronic device that is operated at elevated temperature.