Multi-layer packaging material, a package and a method for manufacturing a muti-layer packaging material

Abstract

The disclosure refers to a multi-layer packaging material comprising, from its outermost side to its innermost side, the following layers: a cellulose-based material layer having a grammage from 40 to 120 g/m 2 ; a tie coating layer, the tie coating layer comprising a polymeric binder; an intermediate polymeric coating layer, the intermediate polymeric coating layer comprising a polyvinyl alcohol (PVA) polymer; a vacuum deposited metallization layer; and an inner polymeric coating layer, the inner polymeric coating layer comprising a material selected from a group comprising acrylic copolymers, polyesters, polyurethanes, polyester copolymers, polyurethane copolymers, vinyl acetates copolymers, chloride copolymers and any combination thereof.

1 . A multi-layer packaging material comprising from, its outermost side to its innermost side, the following layers:
 a cellulose-based material layer having a grammage from 40 to 120 g/m 2 ;   a tie coating layer, the tie coating layer comprising a polymeric binder;   an intermediate polymeric coating layer, the intermediate polymeric coating layer comprising a polyvinyl alcohol (PVA) polymer;   a vacuum deposited metallization layer; and   an inner polymeric coating layer, the inner polymeric layer comprising a polymer selected from: acrylic copolymers; polyesters; polyurethanes; polyester copolymers; polyurethane copolymers; vinyl acetate copolymers; vinyl chloride copolymers; and combinations thereof.   
     
     
         2 . The multi-layer packaging material according to  claim 1 , wherein the tie coating layer comprises a polymeric binder selected from: a mixture of elastomeric polyurethane and nitrocellulose; a sulfopolyester; polyethylenimine (PEI); an acrylic polymer and combinations thereof. 
     
     
         3 . The multi-layer packaging material according to  claim 1 , wherein the polyvinyl alcohol polymer of the intermediate polymeric coating layer is selected from: unmodified polyvinyl alcohol (PVA); ethylene vinyl alcohol (EVOH) copolymer; butanediol vinyl alcohol (BVOH) copolymer; and combinations thereof. 
     
     
         4 . The multi-layer packaging material according to  claim 1 , comprising from one to three intermediate polymeric coating layers of polyvinyl alcohol polymer, preferably two, and more preferably three intermediate polymeric coating layers of polyvinyl alcohol polymer. 
     
     
         5 . The multi-layer packaging material according to  claim 1 , comprising a primer coating layer between the cellulose-based material layer and the tie coating layer, the primer coating layer comprising a material selected from: heat-saleable acrylic emulsions; acrylic copolymers optionally comprising mineral fillings; polyesters; sulphopolyesters; vinyl acetate copolymers: vinyl chloride polymers; and combinations thereof. 
     
     
         6 . The multi-layer packaging material according to  claim 1 , wherein the vacuum deposited metallization layer comprises aluminum, aluminum oxide and/or silicon oxide. 
     
     
         7 . The multi-layer packaging material according to  claim 1 , wherein the vacuum deposited metallization layer has a thickness from 20 to 80 nm, and preferably from 30 to 60 nm. 
     
     
         8 . The multi-layer packaging material according to  claim 1 , wherein the inner polymeric coating layer is obtainable from a polymeric dispersion, in particular is obtainable from a solvent-based and/or water-based polymeric dispersion. 
     
     
         9 . The multi-layer packaging material according to  claim 1 , comprising one or two inner polymeric coating layers, preferably two inner polymeric coating layers. 
     
     
         10 . The multi-layer packaging material according to  claim 9 , wherein:
 when there is one inner polymeric coating layer, the inner polymeric layer comprises a polymer selected from acrylic copolymers, and   when there are two inner polymeric coating layers, a first layer comprises a polymer selected from acrylic copolymers and a second layer comprises a polymer selected from: polyesters; polyurethanes; polyester copolymers; polyurethane copolymers; vinyl acetate copolymers; chloride copolymers; and combinations thereof.   
     
     
         11 . The multi-layer packaging material according to  claim 1 , wherein the surface of the cellulose-based material layer on which the tie coating layer is deposited has a Parker Print Surf (PPS) roughness value from 0.9 to 2.3 μm. 
     
     
         12 . The multi-layer packaging material according to  claim 1 , wherein the surface of the cellulose-based material layer opposite to the surface on which the tie coating layer is deposited has a PPS roughness value from 0.9 to 4.5 μm. 
     
     
         13 . The multi-layer packaging material according to  claim 1 , wherein the surface of the cellulose-based material layer on which the tie coating layer and is deposited has a COBB index from 2 to 20 g/m 2 , preferably from 2 to 6 g/m 2 . 
     
     
         14 . A package for products comprising the multi-layer packaging material according to  claim 1 . 
     
     
         15 . A method for manufacturing a mufti-layer packaging material, the method comprising the steps of:
 providing a cellulose-based material layer having a grammage from 40 to 120 g/m 2 ;   depositing, by a dispersion coating technique, a tie coating layer onto the cellulose-based material layer, the tie coating layer comprising a polymeric binder;   depositing, by a dispersion coating technique, an intermediate polymeric coating layer onto the tie layer, the intermediate polymeric coating layer comprising a polyvinyl alcohol (PVA) polymer;   depositing, by a vacuum deposition technique, a metallization layer onto the intermediate polymeric coating layer; and   depositing, by a dispersion coating technique, an inner polymeric coating layer onto the metallization layer, the inner polymeric coating layer comprising a polymer selected from: acrylic copolymers; polyesters; polyurethanes; polyester copolymers; polyurethane copolymers; vinyl acetate copolymers; chloride copolymers; and combinations thereof.   
     
     
         16 . The multi-layer packaging material according to  claim 1 , wherein the intermediate polymeric coating layer is present in an amount from 1 to 3.75 g/m 2 , preferably, between 1 to 3 g/m 2 . 
     
     
         17 . The multi-layer packaging material according to  claim 1 , wherein the tie coating layer is present in an amount from 0.5 and 4 g/m 2 . 
     
     
         18 . The multi-layer packaging material according to  claim 1 , wherein the inner polymeric coating layer is present in an amount from 1 to 4.5 g/m 2 . 
     
     
         19 . A multi-layer packaging material comprising from, its outermost side to its innermost side, the following layers:
 a cellulose-based material layer having a grammage from 40 to 120 g/m 2 ;   a tie coating layer, the tie coating layer comprising a polymeric binder selected from: a mixture of elastomeric polyurethane and nitrocellulose; a sulfopolyester;   polyethylenimine (PEI); an acrylic polymer and combinations thereof;   an intermediate polymeric coating layer, the intermediate polymeric coating layer comprising a polyvinyl alcohol (PVA) polymer;   a vacuum deposited metallization layer; and   an inner polymeric coating layer, the inner polymeric layer comprising a polymer selected from: acrylic copolymers; polyesters; polyurethanes; polyester copolymers; polyurethane copolymers; vinyl acetate copolymers; vinyl chloride copolymers; and combinations thereof.   
     
     
         20 . The multi-layer packaging material according to  claim 19 , comprising:
 three intermediate polymeric coating layers, and   two inner polymeric coating layers, wherein a first layer comprises a polymer selected from acrylic copolymers and a second layer comprises a polymer selected from: polyesters; polyurethanes; polyester copolymers; polyurethane copolymers; vinyl acetate copolymers; chloride copolymers; and combinations thereof.