Polymer packaging layer with improved release properties
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.
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.