Multilayer Acrylate Adhesive for Low Surface Energy Substrates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pressure sensitive adhesives (PSAs) often fail to provide sufficient tack and shear resistance on low and medium surface energy substrates, and excessive use of tackifiers can compromise their performance by affecting cohesive strength and stability.
Innovation Solution
A pressure sensitive adhesive polymeric foam composition combining a first (meth)acrylate copolymer with a second (meth)acrylate copolymer, where the first copolymer contains 0.1-12 wt% and the second copolymer contains 15-40 wt% (meth)acrylic acid monomer units, forming a multilayer assembly with a polymeric foam layer and an adjacent adhesive layer to enhance adhesion and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If higher amounts of tackifiers are added to improve adhesion on LSE and MSE substrates, then peel force and initial tack are improved, but shear resistance and cohesive strength deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating (meth)acrylic acid monomer units with specific content ranges (0.1-12 wt% in first copolymer, 15-40 wt% in second copolymer) to optimize the balance between adhesion and cohesive strength without relying on excessive tackifiers
Solution Approach 2:
The patent creates a composite adhesive system by combining two distinct (meth)acrylate copolymers with different (meth)acrylic acid contents, where the first copolymer provides base adhesive properties and the second copolymer enhances adhesion to challenging substrates while maintaining overall structural integrity
2Force
If higher amounts of tackifiers are used to improve adhesion, then initial tack is improved, but glass transition temperature increases
Solution Approach 1:
The patent optimizes the molecular composition by controlling (meth)acrylic acid monomer content within specific ranges, which influences the glass transition temperature and maintains adhesive flexibility while achieving sufficient initial tack without tackifier overuse
3Force
If tackifiers are added to improve adhesion, then peel force is improved, but stability and color resistance deteriorate due to migration into substrate
Solution Approach 1:
The patent modifies the chemical structure and composition of the adhesive by incorporating controlled amounts of (meth)acrylic acid monomer units, which improve adhesion through chemical interaction with substrates rather than through tackifier migration, thereby maintaining long-term stability and preventing color changes
4Device complexity
If a single-layer adhesive composition is used, then device complexity is low, but adhesion performance on various substrates is insufficient
Solution Approach 1:
The patent develops a composite adhesive composition consisting of two distinct (meth)acrylate copolymers with different functional characteristics, where the first copolymer provides base adhesive properties and the second copolymer enhances performance on challenging substrates, achieving versatile adhesion without complex multi-layer structures
Data Source
AI summary
The present disclosure relates to a pressure sensitive adhesive composition, comprising: a) a first (meth)acrylate copolymer comprising from 0.1 to 12 wt% of (meth)acrylic acid monomer units, based on the weight of the first (meth)acrylate copolymer; and b) a second (meth)acrylate copolymer comprising from 15 to 40 wt% of (meth)acrylic acid monomer units, based on the weight of the second (meth)acrylate copolymer. According to another aspect, the present disclosure is directed to a multilayer pressure sensitive adhesive assembly comprising a pressure sensitive adhesive composition as described above in the form of a first pressure sensitive adhesive polymeric layer, and which further comprises a second pressure sensitive adhesive layer adjacent to the first pressure sensitive adhesive polymeric layer. In another aspect, the present disclosure is directed to a method of manufacturing a pressure sensitive adhesive composition as described above and to uses thereof.