US2006243626A1PendingUtilityA1

Polymer packaging layer with improved release properties

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Assignee: CORUS STAAL BVPriority: Feb 18, 2003Filed: Feb 18, 2004Published: Nov 2, 2006
Est. expiryFeb 18, 2023(expired)· nominal 20-yr term from priority
Inventors:Coenraad SpaansLene HviidCornelis Johannes WaringaJohannes Dommershuijzen
C08L 23/12C08L 23/147C08L 67/02C08L 23/14C08L 23/16C08L 23/06B32B 15/08B32B 27/32B32B 15/18B32B 2307/748B32B 27/36
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Claims

Abstract

Use of a polymer material as a product contact layer in or on packaging for a product, wherein the polymer material is made from a blend of a polyester resin and an apolar resin such as a polyolefin and has improved product-release properties as compared to a polymer material made from essentially the polyester resin.

Claims

exact text as granted — not AI-modified
1 . A method of making packaging comprising the steps of: 
 coating a multi-layer system comprising at least three layers in or on a metal substrate for packaging for a product, wherein the at least three layers comprises a product contact layer comprising polymer material, wherein the polymer material comprises a blend of a polyester resin and an apolar resin to improve the product-release properties as compared to a material made from essentially the polyester resin.    
     
     
         2 . The method according to  claim 1 , wherein the apolar resin is selected from the group consisting of PE, PP, and a copolymer comprising PE and PP.  
     
     
         3 . The method according to  claim 1 , wherein the apolar resin is modified polypropylene.  
     
     
         4 . The method according to  claim 3 , wherein the apolar resin is maleic acid modified polypropylene.  
     
     
         5 . The method according to  claim 1 , wherein the polyester is selected from the group consisting of PET, modified PET, PEI, PBT and combinations thereof.  
     
     
         6 . The method according to  claim 1 , wherein the polymer material is coated onto a substrate in the form of a film before the substrate is formed into packaging.  
     
     
         7 . The method according to  claim 1 , wherein the polymer material is directly extruded onto a substrate before the substrate is formed into packaging.  
     
     
         8 . The method according to  claim 1 , wherein the apolar resin is EPDM.  
     
     
         9 . The method according to  claim 1 , wherein said polymer material is coated onto a packaging steel substrate.  
     
     
         10 . The method according to  claim 1 , wherein the system contains an adhesion layer between the product contact layer and the substrate, and a bulk layer between the adhesion layer and the product contact layer.  
     
     
         11 . The method according to  claim 10 , wherein the bulk layer consists of bottle-grade PET.  
     
     
         12 . The method according to  claim 1 , wherein the polymer material is coated onto a packaging steel substrate selected from the group consisting of TFS/ECCS steel substrate.  
     
     
         13 . Packaging for a product wherein the packaging comprises 
 a metal substrate,    a multi-layer system comprising at least three layers wherein the at least three layers comprises a polymer material as a product contact layer which in use contacts the product,    wherein the metal substrate is coated with the polymer material    wherein the polymer material comprises a blend of a polyester resin and an apolar resin to improve the product-release properties as compared to a polymer material made from essentially the polyester resin.    
     
     
         14 . Packaging according to  claim 13 , wherein the apolar resin is selected from PE, PP, and a copolymer comprising PE and PP.  
     
     
         15 . Packaging according to  claim 13 , wherein the apolar resin is modified PP.  
     
     
         16 . Packaging according to  claim 13 , wherein the apolar resin is maleic acid anhydride modified PP.  
     
     
         17 . Packaging according to  claim 13 , wherein the polyester is PET or modified PET or PEI or PBT and combinations thereof.  
     
     
         18 . Packaging according to  claim 13 , wherein the wherein the packaging comprises a packaging steel substrate coated with the polymer material.  
     
     
         19 . Packaging according to  claim 13 , wherein the apolar resin is EPDM.  
     
     
         20 . Packaging according to  claim 18 , wherein the polymer material is coated onto at least one side of the substrate in the form of a film, before the substrate is formed into packaging.  
     
     
         21 . Packaging according to  claim 20 , wherein the polymer material is directly extruded onto at least one side of the substrate before the substrate is formed into packaging.  
     
     
         22 . Packaging according to  claim 13 , which is retortable.  
     
     
         23 . Packaging according to  claim 13 , wherein the system contains an adhesion layer between the product contact layer and the substrate, and a bulk layer between the adhesion layer and the product contact layer.  
     
     
         24 . Packaging according  claim 23 , wherein the bulk layer consists of bottle-grade PET.  
     
     
         25 . Packaging according to  claim 13 , wherein the polymer material is coated onto a packaging steel substrate selected from the group consisting of TFS/ECCS steel substrate.  
     
     
         26 . The method according to  claim 1 , wherein the apolar resin comprises a polyolefin.  
     
     
         27 . Packaging according to  claim 13 , wherein the apolar resin comprises a polyolefin.

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