Pressure sensitive adhesive tear tape

Abstract

A tape that includes a cellulosic substrate defining a first surface and an opposing second surface; a pressure sensitive adhesive disposed on the first surface of the cellulosic substrate; and an encapsulated fibrous material disposed on the first surface of the cellulosic substrate or the second surface of the cellulosic substrate.

What is claimed is: 
     
         1 . An adhesive composition comprising:
 a base polymer comprising an ethylene vinyl acetate polymer; and   a surface-migratory release agent with a melt point of at least 120° C.   
     
     
         2 . The adhesive composition of  claim 1 , wherein the composition comprises 10 to 60 weight percent ethylene vinyl acetate copolymer; 10 to 40 weight percent of at least one tackifier; 5 to 30 weight percent wax; and 5 to 30 weight percent of surface-migratory release agent, based on the total weight of the adhesive composition. 
     
     
         3 . The adhesive composition of  claim 1 , wherein the composition is a hot melt adhesive composition. 
     
     
         4 . The adhesive composition of  claim 1 , wherein the release agent comprises ethyl acrylate-acrylonitrile copolymer, acrylic acid-alkyl acrylate copolymer, polyvinyl chloride resin, polyvinyl N-octadecyl carbamate, polyethylene based wax, polyamide based wax, fluorocarbon polymer, polyvinyl ester, polyethylene imine, alkyl substituted amine, fatty acid material, a chromium complex, or a mixture thereof. 
     
     
         5 . The adhesive composition of  claim 1 , wherein the release agent comprises a polysiloxane. 
     
     
         6 . The adhesive composition of  claim 1 , wherein the release agent comprises a fatty acid material. 
     
     
         7 . The adhesive composition of  claim 2 , wherein the at least one tackifier is selected from a coumarone-indene resin, a terpene resin, a rosin, or a mixture thereof. 
     
     
         8 . The adhesive composition of  claim 3 , wherein the hot melt adhesive has a melt point of at least 90° C. 
     
     
         9 . The adhesive composition of  claim 1 , wherein the release agent is present in an amount of 5 to 30 weight percent, based on the total weight of the hot melt adhesive composition. 
     
     
         10 . The adhesive composition of  claim 1 , wherein the release agent is present in an amount of 10 to 20 weight percent, based on the total weight of the hot melt adhesive composition. 
     
     
         11 . The adhesive composition of  claim 6 , wherein the fatty acid material is in the form of a fatty acid, a fatty acid ester, fatty acid amide, or a fatty acid condensate. 
     
     
         12 . The adhesive composition of  claim 2 , wherein the release agent comprises a fatty acid material. 
     
     
         13 . The adhesive composition of  claim 1 , wherein the release agent comprises a fatty acid condensate or an ethylene bisstearamide. 
     
     
         14 . The adhesive composition of  claim 2 , wherein the release agent comprises a fatty acid condensate or an ethylene bisstearamide. 
     
     
         15 . A tape comprising:
 a cellulosic substrate defining a first surface and an opposing second surface;   a pressure sensitive adhesive disposed on the first surface of the cellulosic substrate; and   an encapsulated fibrous material disposed on the first surface of the cellulosic substrate, wherein the pressure sensitive adhesive encapsulates the fibrous material and adheres the fibrous material to the first surface of the cellulosic substrate.   
     
     
         16 . A tear opening system for a paper board construct, comprising:
 (a) a paper board substrate defining a first surface and a second surface;   (b) at least one tear tape of  claim 15  disposed on at least one of the first surface or the second surface of the paper board substrate,   wherein the pressure sensitive adhesive of the tear tape adheres to the first surface or the second surface of the paper board substrate; and   (c) a tear-initiating element associated with the tear tape and the paper board substrate.   
     
     
         17 . A method for making a tape comprising:
 applying a hot melt adhesive to a fibrous substrate;   joining the hot melt adhesive-applied fibrous substrate with a first surface of a cellulosic substrate at a condition in which the hot melt adhesive is in a molten state prior to contacting the hot melt adhesive-applied fibrous substrate with the cellulosic substrate; and   applying a pressure sensitive adhesive to a second surface of the cellulosic substrate, wherein the first surface of the cellulosic substrate opposes the second surface of the cellulosic substrate.   
     
     
         18 . The method of  claim 17 , wherein the hot melt adhesive comprises:
 a base polymer comprising an ethylene vinyl acetate polymer; and   a surface-migratory release agent with a melt point of at least 120° C.   
     
     
         19 . A method for making a tear opening system for a paper board construct having a first surface and an opposing second surface, comprising:
 applying at least one tear tape to at least the first surface of the paper board construct or the second surface of the paper board construct at a dry end section of a paper board construct manufacturing process, wherein the tear tape includes:
 a cellulosic substrate defining a first surface and an opposing second surface; 
 a pressure sensitive adhesive disposed on the first surface of the cellulosic substrate; and 
 a fibrous material disposed on the first surface of the cellulosic substrate or the second surface of the cellulosic substrate, and 
   wherein the tear tape is applied such that the pressure sensitive adhesive of the tear tape adheres to the first surface or the second surface of the paper board substrate.