Electrically conductive pressure sensitive adhesives, method of manufacture, and use thereof

Abstract

An adhesive, comprising a pressure-sensitive adhesive composition; and carbon nanotubes in an amount effective to render the pressure-sensitive adhesive composition electrically conductive. Such adhesives are of particular use with gasketing materials.

1 . An adhesive, comprising 
 a pressure-sensitive adhesive composition; and    carbon nanotubes in an amount effective to render the pressure-sensitive adhesive composition electrically conductive.    
     
     
         2 . The adhesive of  claim 1 , having a volume resistivity of about 10 −3  ohm-cm to about 10 8  ohm-cm.  
     
     
         3 . The adhesive of  claim 1 , having a volume resistivity of less than about 10 ohm-cm.  
     
     
         4 . The adhesive of  claim 1 , having a volume resistivity of less than about 1 ohm-cm.  
     
     
         5 . An article comprising the adhesive composition of  claim 1  disposed on a substrate.  
     
     
         6 . The article of  claim 5 , wherein the substrate is electrically conductive.  
     
     
         7 . The article of  claim 6 , wherein the substrate has a volume resistivity of about 10 −3  ohm-cm to about 10 8  ohm-cm.  
     
     
         8 . The article of  claim 7 , wherein the substrate has a volume resistivity of less than about 10 ohm-cm.  
     
     
         9 . The article of  claim 7 , wherein the substrate has a volume resistivity of less than about 1 ohm-cm.  
     
     
         10 . A pressure-sensitive adhesive tape, comprising 
 a backing layer having a first side and a second side opposite said first side; and    a pressures-sensitive adhesive layer having a first side and a second side opposite the first side, wherein 
 the first side of the pressure-sensitive adhesive layer is in contact with at least a portion of the first side of the backing layer,  
 the second side is bondable under pressure to a substrate, and  
 the pressure-sensitive adhesive layer comprises 
 a pressure-sensitive adhesive composition; and  
 carbon nanotubes in an amount effective to render the pressure-sensitive adhesive composition electrically conductive.  
 
   
     
     
         11 . The tape of  claim 10 , wherein the backing layer is an electrically conductive polymer.  
     
     
         12 . The tape of  claim 10 , wherein the backing layer is an electrically conductive silicone.  
     
     
         13 . The tape of  claim 10 , wherein the backing layer has a volume resistivity of about  10   −3  ohm-cm to about 10 8  ohm-cm.  
     
     
         14 . The tape of  claim 12 , wherein the backing layer has a volume resistivity of less than about 10 ohm-cm.  
     
     
         15 . The tape of  claim 12 , wherein the backing layer has a volume resistivity of less than about 1 ohm-cm.  
     
     
         16 . An article, comprising 
 a substrate having a surface; and    the tape of  claim 10 , wherein the second side of the pressure-sensitive adhesive layer is bonded to at least a portion of the surface of the substrate.    
     
     
         17 . The article of  claim 16 , wherein the tape provides an EMI shielding effectiveness of at least about 60 dB over a frequency range of about 10 to about 10 GRz.  
     
     
         18 . The article of  claim 16 , wherein the initial peel strength between the backing and the surface of the substrate is about 1.5 to about 5.0 lb/in (0.26-0.87 N/m).  
     
     
         19 . The article of  claim 16 , wherein the volume resistivity between the backing and the surface of the substrate is about 10 −3  ohm-cm to about 10 8  ohm-cm.  
     
     
         20 . A method of manufacture of an adhesive, comprising 
 mixing a pressure-sensitive adhesive formulation in a solvent or diluent with carbon nanotubes;    applying the mixture to a substrate or backing layer;    removing the solvent or diluent; and    optionally curing the adhesive.