Recyclable barrier paper

Abstract

A barrier paper having a paper substrate having a front side and a back side opposite the front side, and a barrier layer disposed to the front side of the paper substrate. The barrier layer has of a polymeric binder and a wax based on a vegetable oil, the use of a barrier paper as wrapping paper, lining paper, paper for inner-bag packaging, interleaving paper and/or release paper for foods, and also to a method for producing a barrier paper.

1 .- 16 . (canceled) 
     
     
         17 . A barrier paper comprising:
 a paper substrate having a front side and a back side opposite the front side;   
       and
 a barrier layer disposed on the front side and/or back side of the paper substrate, 
 wherein the barrier layer comprises at least a polymeric binder and a wax based on a vegetable oil. 
 
     
     
         18 . The barrier paper as claimed in  claim 17 , wherein the wax based on a vegetable oil is a wax based on an oil selected from one or more of palm oil, coconut oil, poppyseed oil, olive oil, linseed oil, soybean oil, sunflower oil, safflower oil, and rapeseed oil. 
     
     
         19 . The barrier paper as claimed in  claim 17 , wherein the wax based on a vegetable oil is a wax based on a soybean oil. 
     
     
         20 . The barrier paper as claimed in  claim 17 , wherein a mass fraction of the wax in the barrier layer is at least one of:
 6 to 98% based on a total mass of the barrier layer,   20 to 90% based on the total mass of the barrier layer, and   50 to 89%, based on the total mass of the barrier layer.   
     
     
         21 . The barrier paper as claimed in  claim 17 , wherein a mass fraction of the wax in the barrier layer is 20 to 78%. 
     
     
         22 . The barrier paper as claimed in  claim 17 , wherein the wax has a melting point of above at least one of 40° C., 50° C., and 60° C. 
     
     
         23 . The barrier paper as claimed in  claim 17 , wherein the polymeric binder is a crosslinked or noncrosslinked binder selected from the group consisting of starch, polyvinyl alcohol, carboxyl group-modified polyvinyl alcohol, ethylene-vinyl alcohol copolymer, a combination of polyvinyl alcohol and ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, silanol group-modified polyvinyl alcohol, diacetone-modified polyvinyl alcohol, acrylate copolymer, modified polyethylene glycol, unmodified polyethylene glycol, α-isodecyl-ω-hydroxy-poly(oxy-1,2-ethanediyl), styrene-butadiene latex, styrene-acrylate polymers, and mixtures thereof. 
     
     
         24 . The barrier paper as claimed in  claim 17 , wherein the polymeric binder comprises one or more styrene-acrylate polymers. 
     
     
         25 . The barrier paper as claimed in  claim 24 , wherein the acrylate copolymer is a copolymer prepared using two or more monomers selected from the group consisting of methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, and styrene. 
     
     
         26 . The barrier paper as claimed in  claim 17 , wherein a mass fraction of the polymeric binder in the barrier layer is at least one of:
 94 to 2% based on a total mass of the barrier layer,   80 to 10% based on the total mass of the barrier layer, and   50 to 11% based on the total mass of the barrier layer.   
     
     
         27 . The barrier paper as claimed in  claim 17 , wherein the barrier layer further comprises a wax based on saturated hydrocarbons. 
     
     
         28 . The barrier paper as claimed in  claim 27 , wherein the wax based on saturated hydrocarbons has a melting point of above at least one of 40° C., 50° C., and 60° C. 
     
     
         29 . The barrier paper as claimed in  claim 27 , wherein the wax based on saturated hydrocarbons comprises at least one alkane selected from the group consisting of heneicosane, docosane, tricosane, tetracosane, pentacosane, hexacosane, heptacosane, octacosane, nonacosane, triacontane, hentriacontane, dotriacontane, tritriacontane, tetratriacontane, pentatriacontane, hexatriacontane, heptatriacontane, octatriacontane, and nonatriacontane. 
     
     
         30 . The barrier paper as claimed in  claim 17 , further comprising:
 an interlayer disposed between the paper substrate and the barrier layer.   
     
     
         31 . The barrier paper as claimed in  claim 17 , wherein the barrier paper is configured as one or more of wrapping paper, lining paper, interleaving paper and/or release paper for foods, for wrapping, lining, interleaving and/or separating of bakery products, fried and/or deep-fried products, snack products, sandwiches, bread, burgers, meat products, fish products, sausage products, and/or cheese. 
     
     
         32 . A method for producing a barrier paper, comprising:
 (i) one of producing and providing a paper substrate;   (ii) one of producing and providing a barrier coat comprising a wax emulsion, wherein the wax is based on a vegetable oil; and   (iii) applying the barrier coat to one side of the paper substrate and subsequently drying the barrier coat, to provide a barrier layer.   
     
     
         33 . The method for producing a barrier paper of  claim 32 , further comprising:
 (iv) disposing an interlayer between the paper substrate and the barrier layer.