Laminated adhesive tape and composition therefor

Abstract

A laminated adhesive tape includes a substrate comprising two or more plies of thin, flexible material, the substrate having a first major surface and a second major surface opposite the first major surface. A polymeric laminating composition comprising a polymer and an alkyl ketene dimer binds the two or more plies and a pressure sensitive adhesive carried on the first major surface. In a further aspect, a method of making a laminated adhesive tape is provided.

What is claimed is: 
     
         1 . A laminated adhesive tape comprising:
 a substrate comprising two or more plies of thin, flexible material, said substrate having a first major surface and a second major surface opposite the first major surface;   a polymeric laminating composition comprising a polymer and an alkyl ketene dimer binding the two or more plies; and   a pressure sensitive adhesive carried on the first major surface.   
     
     
         2 . The laminated adhesive tape of  claim 1 , wherein said two or more plies includes a first ply and a second ply, the first ply defining the first major surface and the second ply defining the second major surface. 
     
     
         3 . The laminated adhesive tape of  claim 2 , wherein said first ply is formed of a warp-knit material and said second ply is formed of a nonwoven material. 
     
     
         4 . The laminated adhesive tape of  claim 3 , wherein said warp-knit material is formed of a polyester and said nonwoven material is formed of polypropylene. 
     
     
         5 . The laminated adhesive tape of  claim 2 , wherein the first ply is impregnated with the polymeric laminating composition. 
     
     
         6 . The laminated adhesive tape of  claim 2 , wherein the coating weight of the polymeric laminating composition is in the range of 40 to 100 g/m 2 . 
     
     
         7 . The laminated adhesive tape of  claim 1 , wherein the laminated adhesive tape is hand tearable. 
     
     
         8 . The laminated adhesive tape of  claim 1 , wherein the polymeric laminating composition contains from 5-30% of the alkyl ketene dimer by weight after drying. 
     
     
         9 . The laminated adhesive tape of  claim 1 , wherein said polymer is a copolymer of vinyl acetate and ethylene (VAE). 
     
     
         10 . The laminated adhesive tape of  claim 1 , wherein said two or more plies includes:
 a first ply having a first surface defining the first major surface and a second surface opposite the first surface;   a second ply directly contacting the second surface of the first ply; and   a third ply having a first surface directly contacting the second ply and a second surface opposite the first surface, the second surface of the third ply defining said second major surface.   
     
     
         11 . The laminated adhesive tape of  claim 10 , wherein said first ply and third ply are each formed of a warp-knit material and said second ply is formed of a nonwoven material. 
     
     
         12 . The laminated adhesive tape of  claim 11 , wherein said first ply and said third ply are formed of a polyester and said second ply is formed of polypropylene. 
     
     
         13 . The laminated adhesive tape of  claim 10 , wherein the first ply is impregnated with the polymeric laminating composition. 
     
     
         14 . The laminated adhesive tape of  claim 10 , wherein the coating weight of the polymeric laminating composition is in the range of 20 to 100 g/m 2 . 
     
     
         15 . The laminated adhesive tape of  claim 1 , wherein said pressure sensitive adhesive is selected from the group consisting of acrylate, silicone, silicone acrylic copolymer, and styrene butadiene rubber adhesives. 
     
     
         16 . The laminated adhesive tape of  claim 15 , wherein the pressure sensitive adhesive comprises on or more of a tackifier, a surfactant, and a colorant. 
     
     
         17 . The laminated adhesive tape of  claim 1 , wherein the laminated adhesive tape is rolled up into a roll. 
     
     
         18 . The laminated adhesive tape of  claim 17 , wherein the second major surface does not include a release layer. 
     
     
         19 . A method of making a laminated adhesive tape comprising:
 drawing a first layer of backing material from a supply thereof and passing said first layer through a bath of a laminating composition comprising a polymer and an alkyl ketene dimer to produce a coated layer;   drawing a second layer of backing material from a supply thereof;   passing the coated layer and the second layer through a nip of cooperating nip rollers to produce a multi-ply substrate;   drying the multi-ply substrate; and   applying a pressure sensitive adhesive to at least one surface of the multi-ply substrate.   
     
     
         20 . The method of  claim 19 , wherein the first layer is formed of a warp-knit material and the second layer is formed of a nonwoven material. 
     
     
         21 . The method of  claim 20 , wherein said warp-knit material is formed of a polyester and said nonwoven material is formed of polypropylene. 
     
     
         22 . The method of  claim 19 , further comprising:
 drawing a third layer of backing material from a supply thereof; and   passing the third layer together with the coated layer and the second layer through the nip of the cooperating nip rollers to produce the multi-ply substrate.   
     
     
         23 . The method of  claim 22 , wherein the third layer is formed of a warp-knit material. 
     
     
         24 . The method of  claim 23 , wherein said warp-knit material is formed of a polyester. 
     
     
         25 . The method of  claim 19 , wherein the a pressure sensitive adhesive is applied to the first layer. 
     
     
         26 . The method of  claim 19 , further comprising winding said laminated material into roll. 
     
     
         27 . The method of  claim 19 , wherein said polymer is a copolymer of vinyl acetate and ethylene (VAE).