Method for producing a coated packaging material

Abstract

The disclosure relates to a method for producing a coated packaging material, in particular a laminate, wherein at least the following steps are carried out: a) providing a cellulose-containing substrate, b) coating at least one surface region of the substrate with a curable composition and curing the composition, forming a primer layer, and c) generating a metal-containing layer on at least one surface region of the primer layer. According to the disclosure, the composition used in step b) contains at least one ionically polymerizable monomer that is cured via ionic polymerization. The disclosure also relates to a packaging material including a cellulose-containing substrate having a layer system, wherein the layer system has at least one primer layer and a metal-containing layer, wherein the primer layer includes/is at least one polymer cured via ionic polymerization, and a packaging produced from at least one packaging material of this type.

1 . A method for producing a coated packaging material, more particularly a laminate, comprising at least the steps of:
 a) providing a cellulose-containing substrate;   b) coating at least one surface region of the substrate with a curable composition and curing the composition to form a priming coat; and   c) generating a metal-containing layer on at least one surface region of the priming coat;   
       wherein the composition used in step b) comprises at least one ionically polymerizable monomer which is cured by ionic polymerization. 
     
     
         2 . The method as claimed in  claim 1 , wherein the composition used in step b) is cured anionically or cationically and/or by living ionic polymerization. 
     
     
         3 . The method as claimed in  claim 1 , wherein the composition used in step b) is cured by means of an initiator, more particularly a preferably blocked compound from the group of the Lewis and/or Brønsted acids and/or the Lewis and/or Brønsted bases, and/or by thermal and/or photochemical activation. 
     
     
         4 . The method as claimed in  claim 1 , wherein the at least one ionically polymerizable monomer is selected from a group which encompasses epoxides, more particularly the cycloaliphatic epoxides and glycidyl ethers, isoprenes, cyanoacrylates, lactides, caprolactones, caprolactams, alkylcyclotrisiloxanes, vinyl ethers and isobutenes, and/or from a group which encompasses compounds having at least one electron-donating substituent, more particularly one or more alkoxy, phenyl, vinyl and/or 1,1-dialkyl groups. 
     
     
         5 . The method as claimed in  claim 1 , wherein the curing in step b) is carried out at an atmospheric humidity and/or surface humidity of between 5% and 65%. 
     
     
         6 . The method as claimed in  claim 1 , wherein the composition used in step b) comprises at least one polyol, more particularly from a group which encompasses polyethylene glycols, polypropylene glycols, polyethylene-propylene glycols and poly(tetrahydrofuran)diols. 
     
     
         7 . The method as claimed in  claim 1 , wherein the composition used in step b) comprises nanoparticles, more particularly from the group of modified and unmodified silica particles. 
     
     
         8 . The method as claimed in  claim 1 , wherein the curable composition comprises at least one solvent, more particularly a weakly polar solvent from the group of methylene chloride, toluene, apolar hydrocarbons, and tetrahydrofuran. 
     
     
         9 . The method as claimed in  claim 1 , wherein the ionic polymerization is terminated by addition of at least one counterion and/or of at least one terminating reagent and/or by backbiting, and/or in that at least one second monomer type is added when the at least one monomer has reached or exceeded a predetermined degree of polymerization. 
     
     
         10 . The method as claimed in  claim 1 , wherein the curable composition is applied to the substrate by means of a leveling coating process, more particularly by means of doctor, blade and/or film press and/or by means of a contour coating process, more particularly by means of casting, spraying, curtain coating and/or airbrush, and/or by a printing process, more particularly by planographic printing, gravure printing, digital printing, screen printing and/or relief printing. 
     
     
         11 . The method as claimed in  claim 1 , wherein the priming coat is surface-treated before step c). 
     
     
         12 . The method as claimed in  claim 1 , wherein the metal-containing layer is produced by applying and drying and/or curing a metallic paint and/or by physical and/or chemical vapor deposition, more particularly by organometallic chemical vapor deposition. 
     
     
         13 . The method as claimed in  claim 1 , wherein a top layer, which more particularly is opaque or transparent, is applied to the metal-containing layer. 
     
     
         14 . A packaging material comprising a cellulose-containing substrate having a layer system, said layer system comprising at least one priming coat and a metal-containing layer, wherein the priming coat is or comprises at least one polymer cured by bionic polymerization. 
     
     
         15 . A package which comprises at least one packaging material which is obtainable and/or obtained by a method as claimed in  claim 1 . 
     
     
         16 . A package which comprises at least one packaging material that takes the form as claimed in  claim 14 .