Method for inhibiting delamination of a polymeric coating from a container body

Abstract

A method to inhibit separation of an extruded thermoplastic polymer coating from a metallic alloy container body due to body forming operations. The container body and the extruded thermoplastic polymer coating are inductively heated causing the polymer to flow into the microsurface irregularities on the body interior surface which adheres the polymer to the body.

We claim:  
     
         1 . A method to inhibit separation of an extruded thermoplastic polymer coating from a container body, said method comprising inductively heating the container body to adhere said extruded thermoplastic polymer coating to said body.  
     
     
         2 . The method of  claim 1  wherein said thermoplastic polymer is a polyester or polyolefin.  
     
     
         3 . The method of  claim 1  wherein said thermoplastic polymer is selected from the group consisting of polyethylene terephthalate, polyethylene terpthalate copolymers, blends of polyethylene terphthalate homopolymers with polyethylene terphthalate copolymers, polypropylene, polyethylene, polypropylene copolymers; polyamides, polyimides, polycarbonates and polyvinyl chlorides.  
     
     
         4 . The method of  claim 1  wherein said thermoplastic polymer is selected from the group consisting of blends of polyethylene terphthalate homopolymers with polyethylene terphthalate copolymers.  
     
     
         5 . A method of making a container comprising: 
 (a) forming a cylindrical body having an exterior surface, an interior surface and an edge defining an orifice, said body interior surface coated with an extruded thermoplastic polymer liner, and said body exterior surface optionally decorated and;    (b) inductively heating said body adjacent to said orifice to inhibit separation of said polymer from said body; and    (c) attaching a container end to said body.    
     
     
         6 . The method of  claim 5  wherein said thermoplastic polymer is a polyester or polyolefin.  
     
     
         7 . The method of  claim 5  wherein said thermoplastic polymer is selected from the group consisting of polyethylene terephthalate, polyethylene terpthalate copolymers, blends of polyethylene terphthalate homopolymers with polyethylene terphthalate copolymers, polypropylene, polyethylene, polypropylene copolymers; polyamides, polyimides, polycarbonates and polyvinyl chlorides.  
     
     
         8 . A container comprising an aluminum alloy body and an aluminum alloy end, said container body having an interior surface coated with an extruded thermoplastic polymeric coating inhibited from delamination by inductive thermal adherence of said polymer to said body.  
     
     
         9 . The method of  claim 8  wherein said thermoplastic polymer is a polyester or polyolefin.  
     
     
         10 . The method of  claim 8  wherein said thermoplastic polymer is selected from the group consisting of polyethylene terephthalate, polyethylene terpthalate copolymers, blends of polyethylene terphthalate homopolymers with polyethylene terphthalate copolymers, polypropylene, polyethylene, polypropylene copolymers; polyamides, polyimides, polycarbonates and polyvinyl chlorides.