Multilayer PSA Foam Particles Structural Integrity
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Solution Overview
Problem
Existing multilayer pressure sensitive adhesive (PSA) foam articles and adhesive films lack optimal structural and acoustic properties due to the limitations in layer composition and bonding, which affect their convertibility and performance in applications requiring both adhesion and durability.
Innovation Solution
A unified multilayer article comprising alternating layers of elastomeric foam interior layers with expanded polymeric microspheres and alternate layers, where the elastomeric foam layers are directly bound to the alternate layers, enhancing the structural integrity and adhesion properties by incorporating a PSA attachment layer for attachment to adherends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multilayer PSA foam articles use traditional layer composition and bonding methods, then manufacturing is simpler, but structural integrity and acoustic properties are insufficient
Solution Approach 1:
The adhesive film is divided into multiple alternating layers of elastomeric foam and thermoplastic materials, with each layer serving specific functional purposes. This segmentation allows optimization of individual layer properties for structural integrity and acoustic performance while maintaining manufacturability through standardized layer configurations.
Solution Approach 2:
The patent employs composite material construction by combining elastomeric foam layers containing expanded polymeric microspheres with thermoplastic alternate layers. This composite approach leverages the complementary properties of each material system to achieve enhanced structural integrity and acoustic properties that cannot be obtained with single-material constructions.
2Reliability
If cross-linking strategies are used to enhance adhesion and durability, then bonding strength improves, but manufacturing cost increases
Solution Approach 1:
The thermoplastic alternate layers inherently provide bonding functionality through their thermoplastic nature, eliminating the need for additional cross-linking chemistry. The layers bond to each other and to the elastomeric foam layers through thermal processing alone, making the system self-sufficient for achieving durable adhesion without requiring expensive cross-linking agents or complex curing processes.
Solution Approach 2:
The patent replaces expensive cross-linking strategies with simpler, more cost-effective thermoplastic bonding mechanisms. The thermoplastic layers provide sufficient bonding durability through their inherent material properties and processing methods, offering a cheaper alternative to complex cross-linking chemistries while maintaining reliable adhesion performance.
3Strength
If elastomeric foam layers contain expanded polymeric microspheres, then impact resistance improves, but density increases
Solution Approach 1:
The expanded polymeric microspheres are distributed within specific elastomeric foam layers rather than throughout the entire adhesive film structure. This localized placement of impact-resistant features allows optimization of impact resistance in critical regions while minimizing the overall density increase that would result from uniform distribution of microspheres throughout all layers.
Solution Approach 2:
The elastomeric foam layers incorporate expanded polymeric microspheres that create a porous, cellular structure within the foam matrix. This porous configuration provides impact energy absorption through cell collapse and deformation mechanisms while maintaining relatively low material density compared to solid foam structures, balancing impact resistance with weight considerations.
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 solution improves the convertibility, handling, and impact resistance of the multilayer articles while maintaining or enhancing adhesion properties, providing internal barriers and improved holding power, and reducing the need for costly cross-linking strategies.
Implementation Method 1
elastomeric foam interior layers... which comprise: i) a first elastomeric material, and distributed therein: ii) expanded polymeric microspheres
Implementation Method 2
a first PSA attachment layer, which is an outermost PSA layer directly bound to a first face of the unified multilayer article and available for attachment of the adhesive film to an adherend
Data Source
AI summary
Unified multilayer articles comprising alternating layers including: a) at least two elastomeric foam interior layers, which are interior layers of the unified multilayer article, and which comprise: i) a first elastomeric material, and distributed therein: ii) expanded polymeric microspheres; where the elastomeric foam interior layers alternate with: b) at least two alternate layers directly bound to adjacent elastomeric foam interior layers; and wherein at least one of the alternate layers is an interior layer of the unified multilayer article. Adhesive films comprising the unified multilayer articles of the present disclosure are also provided, which additionally comprises at least one pressure sensitive adhesive attachment layer, which is an outermost PSA layer directly bound to a first face of the unified multilayer article and available for attachment of the adhesive film to an adherend.