Composite Thermoplastic Laminate

Abstract

A composite sheet material includes a cover sheet, a substrate and an adhesion promoting layer. The cover sheet has a cover sheet material. The substrate has a substrate material. The adhesion promoting layer is disposed between the cover sheet and the substrate. A first side of the adhesion promoting layer disposed towards the cover sheet has an affinity to bond with the cover sheet material. A second side of the adhesion promoting layer disposed towards the substrate has an affinity to bond with the substrate material.

1 . A composite sheet material, comprising:
 a cover sheet having a cover sheet material that includes polyethylene terephthalate;   a substrate having a substrate material that includes polypropylene; and   a radio frequency shielding layer disposed between the cover sheet and the substrate.   
     
     
         2 . The composite sheet material according to  claim 1 , wherein the radio frequency shielding layer is made of aluminum foil. 
     
     
         3 . The composite sheet material according to  claim 1 , wherein the radio frequency shielding layer comprises an aluminum foil laminated onto a polyethylene terephthalate. 
     
     
         4 . The composite sheet material according to  claim 1 , wherein the radio frequency shielding layer comprises a thermoplastic layer comprising conductive particles selected from the group consisting of Al, Cu, and C. 
     
     
         5 . The composite sheet material according to  claim 1 , wherein the substrate is non-woven. 
     
     
         6 . The composite sheet material according to  claim 1 , wherein the composite sheet material further comprises a support layer that is non-woven. 
     
     
         7 . The composite sheet material according to  claim 1 , further comprising an adhesion coating layer. 
     
     
         8 . The composite sheet material according to  claim 7 , wherein the adhesion coating layer comprises one or more of an ethyl vinyl acetate, an ethylene methyl acrylate, a maleic anhydride functionalized polypropylene, and an oxazoline. 
     
     
         9 . The composite sheet material according to  claim 1 , further comprising a polyurethane adhesion promoting layer. 
     
     
         10 . The composite sheet material according to  claim 1 , wherein the polyethylene terephthalate is a biaxially-oriented polyethylene terephthalate. 
     
     
         11 . The composite sheet material according to  claim 1 , further comprising a backing layer comprising a backing layer material, wherein the substrate is disposed between the cover sheet and the backing layer. 
     
     
         12 . The composite sheet material according to  claim 7 , wherein a first side of the adhesion promoting layer is disposed toward the cover sheet and in contact with the cover sheet. 
     
     
         13 . The composite sheet material according to  claim 12 , wherein a second side of the adhesion promoting layer is disposed towards the substrate and in contact with the substrate. 
     
     
         14 . The composite sheet material according to  claim 13 , wherein the second side of the adhesion promoting layer comprises a polypropylene drawn from the substrate, and
 wherein the second side of the adhesion promoting layer has an affinity to bond to the substrate.   
     
     
         15 . The composite sheet material according to  claim 12 , wherein the first side of the adhesion promoting layer has an affinity to bond to the cover sheet. 
     
     
         16 . The composite sheet material according to  claim 9 , wherein the cover sheet is disposed between the polyurethane adhesion promoting layer and the substrate. 
     
     
         17 . The composite sheet material according to  claim 9 , wherein the polyurethane promoting layer comprises a urethane prepolymer. 
     
     
         18 . The composite sheet material according to  claim 9 , wherein the cover sheet comprises a cellulose. 
     
     
         19 . The composite sheet material according to  claim 11 , wherein the backing layer comprises a film selected from the group consisting of a polyethylene terephthalate, a polyamide, a polyimide, a poly phenylsulfone, and a polyamide-imide. 
     
     
         20 . The composite sheet material according to  claim 1 , wherein the cover sheet comprises one or more of a polyethylene terephthalate, a polypropylene, and a biaxially-oriented polyethylene terephthalate, a polyurethane, a thermoplastic polyurethane, a polycarbonate, and a polyamide.