Foamed adhesive and applications thereof

Abstract

A foamed adhesive finds use in the manufacture of packaging materials, and is particularly useful in the manufacture bags comprising at least one heat sealable bag ending.

1 . An article of manufacture having preapplied to at least a portion thereof a reactivatable adhesive, wherein the reactivatable adhesive was applied to the container in the form of a foamed water-based adhesive.  
     
     
         2 . The article of  claim 1  which is a packaging container  
     
     
         3 . The container of  claim 2  which is a bag.  
     
     
         4 . The container of  claim 3  comprising at least one closable bag ending, said adhesive being present on said bag ending.  
     
     
         5 . The container of  claim 2  wherein the container is a bag adapted to package microwave popcorn.  
     
     
         6 . The container of  claim 2  wherein the foamed adhesive comprises at least one resin emulsion.  
     
     
         7 . Th container of  claim 2  wherein the foamed adhesive comprise polyvinyl acetate.  
     
     
         8 . The container of  claim 2  where the adhesive is foamed to from about 20% by volume to about 60% per volume.  
     
     
         9 . The container of  claim 4  wherein the bag ending is closed by application of heat and pressure.  
     
     
         10 . The bag of  claim 3  wherein the bag is made of coated paper.  
     
     
         11 . A process of packaging an article by forming, filling and sealing a package that has had applied to at least a portion thereof a reactivatable adhesive, said reactivatable adhesive being applied as a foamed water-based adhesive.  
     
     
         12 . The process of  claim 11  wherein the package is a bag.  
     
     
         13 . The process of  claim 11  wherein the reactivatable adhesive is a thermoplastic adhesive.  
     
     
         14 . The process of  claim 11  wherein the package is sealed by the application of heat and pressure.  
     
     
         15 . The process of  claim 11  wherein the reactivatable adhesive comprises an energy absorbing ingredient.  
     
     
         16 . The process of  claim 15  wherein the energy absorbing ingredient is a NIR absorbing ingredient.  
     
     
         17 . The process of  claim 11  wherein the adhesive is reactivated using ultrasonic energy.