Poly(meth)acrylate Pressure-Sensitive Adhesive with Acrylonitrile-Butadiene Rubber
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Solution Overview
Problem
Existing poly(meth)acrylate-based pressure-sensitive adhesives have poor chemical resistance, particularly to oleic acid, and low cohesion, which limits their effectiveness in applications requiring both chemical durability and shear strength.
Innovation Solution
A pressure-sensitive adhesive comprising a combination of poly(meth)acrylate and 1 to 49 wt % acrylonitrile-butadiene rubber, processed through a compounding and extrusion apparatus, which enhances chemical resistance and shear strength by optimizing the viscoelastic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If poly(meth)acrylate-based pressure-sensitive adhesives are used, then adhesive properties are maintained, but chemical resistance (especially to oleic acid) is poor
Solution Approach 1:
The patent combines poly(meth)acrylate with acrylonitrile-butadiene rubber (NBR) to create a composite pressure-sensitive adhesive. The NBR component provides excellent chemical resistance particularly to oleic acid, while the poly(meth)acrylate maintains adhesive properties. This composite approach allows the adhesive to withstand chemical environments without sacrificing bonding performance.
2Reliability
If acrylonitrile-butadiene rubber is used to improve chemical resistance, then cohesion is low
Solution Approach 1:
The patent optimizes the NBR content parameter within a specific range (1-49 wt%, preferably 10-45 wt%, more preferably 20-45 wt%) to balance chemical resistance and cohesion. By controlling this compositional parameter, the adhesive achieves sufficient chemical resistance from NBR while maintaining adequate cohesion through the poly(meth)acrylate matrix.
3Reliability
If high NBR content is used to improve chemical resistance, then shear strength decreases
Solution Approach 1:
The patent carefully controls the NBR content parameter within optimized ranges to prevent excessive NBR from compromising shear strength. The specified ranges (1-49 wt% broadly, 10-45 wt% preferably, 20-45 wt% more preferably) ensure that chemical resistance is enhanced while the poly(meth)acrylate maintains sufficient structural integrity for shear load-bearing applications.
4Ease of operation
If poly(meth)acrylate-based adhesives are used for bonding electronic devices and automotive components, then adhesive properties are maintained, but chemical durability is insufficient
Solution Approach 1:
The patent creates a composite adhesive system combining poly(meth)acrylate (providing adhesive properties) with acrylonitrile-butadiene rubber (providing chemical durability). This composite formulation enables the adhesive to bond electronic devices and automotive components effectively while resisting degradation from chemicals encountered in these applications.
Data Source
AI summary
The present invention relates to a pressure-sensitive adhesive comprisingat least one poly(meth)acrylate; andat least one acrylonitrile-butadiene rubber, whereinthe at least one acrylonitrile-butadiene rubber is present at 1 to 49 wt %, based on the total weight of the pressure-sensitive adhesive. The invention further relates to the production of a pressure-sensitive adhesive of the invention and also to the use of the pressure-sensitive adhesive of the invention for the bonding of components of electronic devices or of components in automobiles. Lastly the present invention relates to an adhesive tape comprising at least one layer of a pressure-sensitive adhesive according to the present invention.