Packaging material consisting of an at least double-layered composite material for producing containers for packing liquids

Abstract

Packaging material comprises an at least two-layer laminate of a paper engine-sized in each case with a polymer size or sized cardboard and at least one water-impermeable film or foil for producing containers for packaging liquids, and paper products which are obtainable in each case by (i) engine sizing of a paper stock comprising an aqueous slurry of cellulose fibers with at least one polymer size or with a polymer size and an aqueous dispersion of an alkylketene dimer or a mixture thereof in the presence of a retention aid and, if appropriate, of a water-soluble aluminum compound and, if appropriate, at least one cationic polymer, (ii) drainage of the paper stock on the wire of a paper machine, (iii) drying of the paper product and (iv) lamination of the paper product on one or both sides with a plastics film or metal foil are used for producing containers for packaging liquids, in particular beverages.

1 . A packaging material comprising an at least two-layer laminate of sized paper or sized cardboard and at least one water-impermeable film or foil for producing containers for packaging liquids, wherein the paper or the cardboard is in each case sized with a polymer size.  
   
   
       2 . The packaging material as claimed in  claim 1 , wherein the paper or the cardboard is in each case engine sized with a polymer size.  
   
   
       3 . The packaging material as claimed in  claim 1 , wherein the paper or the cardboard is in each case surface sized with a polymer size.  
   
   
       4 . The packaging material as claimed in  claim 1 , wherein the paper or the cardboard is additionally sized in the presence of aqueous dispersions of reactive sizes and/or combinations of rosin size and alum.  
   
   
       5 . The packaging material as claimed in  claim 1 , wherein the paper or the cardboard is obtainable by successive addition of aqueous alkylketene dispersions and aqueous polymer size dispersions to the paper stock and drainage of the paper stock on the wire of a paper machine.  
   
   
       6 . The packaging material as claimed in  claim 1 , wherein the paper or the cardboard is obtainable by simultaneous addition of aqueous alkylketene dimer dispersions and aqueous polymer size dispersions to the paper stock and drainage of the paper stock on the wire of a paper machine.  
   
   
       7 . The packaging material as claimed in  claim 1 , wherein the paper or the cardboard is obtained by sizing with a size mixture comprising an aqueous polymer size dispersion and an aqueous alkylketene dimer dispersion.  
   
   
       8 . The packaging material as claimed in  claim 1 , wherein the paper or the cardboard is additionally sized in the presence of cationic polymers.  
   
   
       9 . The packaging material as claimed in  claim 1 , wherein the paper or the cardboard is in each case laminated on both sides with a water-impermeable plastics film and/or metal foil.  
   
   
       10 . The packaging material as claimed in  claim 1 , wherein the paper or the cardboard is laminated on one or both sides with a film of polyethylene, polypropylene, copolymer of ethylene and propylene, polyester, polyvinyl alcohol, copolymer of ethylene and vinyl acetate, copolymer of ethylene and vinyl alcohol, or polyamide and/or an aluminum foil.  
   
   
       11 . The packaging material as claimed in  claim 1 , wherein the paper or the cardboard has a basis weight of from 80 to 400 g/m 2  and is laminated on both sides with a polyethylene film.  
   
   
       12 . A method for producing a container for packaging liquids comprising producing a paper product which is obtained by 
 (i) engine sizing of a paper stock comprising an aqueous slurry of cellulose fibers with at least one polymer size or with a polymer size and an aqueous dispersion of an alkylketene dimer or a mixture thereof in the presence of a retention aid and, optionally, of a water-soluble aluminum compound and, optionally, at least one cationic polymer,    (ii) drainage of the paper stock on the wire of a paper machine,    (iii) drying of the paper product and    (iv) lamination of the paper product on one or both sides with a plastics film or metal foil.