Surface-Modified Adhesives for Conductive Functionality
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Solution Overview
Problem
Existing adhesives, particularly pressure-sensitive adhesives, face challenges in modifying their properties without altering the bulk adhesive layer, especially when adding conductive or anti-static features, which can impair optical clarity and increase processing costs and complexity.
Innovation Solution
Surface modification of adhesives by contacting them with a releasing substrate featuring a partially discontinuous particulate layer, a metal grid or mesh, or a frangible layer, allowing for the adherence of these layers to the adhesive surface without altering its bulk properties, thereby creating modified adhesive surfaces that remain adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive or anti-static additives are incorporated into the bulk adhesive layer, then conductivity or anti-static capabilities are improved, but optical clarity deteriorates and processing complexity increases
Solution Approach 1:
The patent divides the adhesive system into two distinct parts: the bulk adhesive layer that maintains optical clarity and the surface layer that provides conductive or anti-static functionality. This segmentation allows each layer to be optimized independently, with conductive particles concentrated at the surface rather than distributed throughout the bulk, thereby preserving optical clarity while achieving the desired electrical properties.
Solution Approach 2:
The invention applies local quality by concentrating conductive or anti-static particles specifically at the adhesive surface where they are needed for functionality, rather than distributing them uniformly throughout the bulk adhesive. This localized approach ensures that the bulk adhesive remains optically clear while the surface provides the required electrical characteristics.
2Reliability
If conductive or anti-static additives are incorporated into the bulk adhesive layer, then conductivity or anti-static capabilities are improved, but processing complexity and costs increase
Solution Approach 1:
The patent employs preliminary action by pre-forming a releasing substrate with a discontinuous particulate layer before applying the adhesive. This allows the conductive particles to be positioned at the adhesive surface during the bonding process itself, eliminating the need for separate steps to add conductive additives to the bulk adhesive and thereby simplifying the overall processing sequence.
Solution Approach 2:
The releasing substrate serves as an intermediary carrier that temporarily holds the discontinuous particulate layer and transfers it to the adhesive surface during the bonding process. This intermediary approach simplifies processing by combining multiple functions (particle distribution, adhesive application, and surface modification) into a single integrated step, rather than requiring separate operations for each function.
3Reliability
If a continuous layer of particulates is applied to the adhesive surface, then conductivity is improved, but adhesive functionality deteriorates due to loss of tack
Solution Approach 1:
The patent applies partial action by using a discontinuous particulate layer rather than a continuous coating. The particulates are distributed in a sparse, non-contiguous pattern on the adhesive surface, providing sufficient conductive pathways for electrical functionality while leaving adequate adhesive material exposed to maintain tack and bonding performance. This partial coverage approach balances the competing requirements of conductivity and adhesion.
Solution Approach 2:
The invention implements local quality by concentrating conductive particles only in specific areas where electrical functionality is needed, rather than covering the entire adhesive surface uniformly. This localized particle distribution ensures that conductive pathways are established where required while preserving adhesive tack in the interstitial areas, thereby maintaining both electrical and adhesive performance.
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
This method allows for the creation of adhesives with modified properties such as conductivity or anti-static capabilities while maintaining their adhesive functionality and minimizing impact on the bulk adhesive layer, reducing the need for extensive additive incorporation and processing steps.
Implementation Method 1
contacting the adhesive layer to the at least partially discontinuous layer on the surface of the substrate, and removing the adhesive layer from the surface of the substrate, such that the at least partially discontinuous layer at least partially adheres to the surface of the adhesive layer upon removal
Implementation Method 2
applying pressure to the formed adhesive layer and substantially continuous frangible layer causing at least portions of the frangible layer to break, and removing the adhesive layer from the surface of the substrate, such that at least a portion of the broken frangible layer adheres to the surface of the adhesive layer
Data Source
AI summary
Surface-modified adhesives may be prepared by contacting an adhesive layer to an at least partially discontinuous layer on a releasing substrate and removing the adhesive layer such that at least a portion of the at least partially discontinuous layer adheres to the adhesive surface. The modified adhesive surface remains an adhesive surface. The modified adhesive layer can be used to prepare adhesive articles, including articles containing multiple surface-modified adhesive layers.