Sealable packaging paper

Abstract

The invention relates to a coated paper, more particularly a translucent coated paper, comprising a base paper and a coating color layer applied thereto, wherein the coating color layer comprising a least one polymer and the coated paper having an opacity in the visible of less than 60%; a method for producing a coated paper of this kind, the use of said coated paper as a packaging material and to packaging comprising the coated paper.

1 . A coated paper comprising a base paper containing less than 5 wt % of fillers and a coating color layer applied directly or indirectly onto one side of the base paper, wherein the coating color layer comprises or consists of at least one heat-sealable material and the coated paper has an opacity in the visible of less than 60%. 
     
     
         2 . The coated paper according to  claim 1 , characterized in that the grammage of the base paper is 45 g/m 2  or less. 
     
     
         3 . The coated paper according to  claim 1 , characterized in that the base paper comprises short fibers, long fibers, recycled pulp and/or alternative fiber materials, such as grass fibers, silphium fibers and/or other mechanically or chemically processed fiber materials. 
     
     
         4 . The coated paper according to  claim 1 , characterized in that the base paper comprises short fibers and long fibers, and that the weight ratio of short fibers to long fibers is greater than 1. 
     
     
         5 . The coated paper according to  claim 1 , characterized in that the coated paper has a cold seam sealing strength of 3 N/15 mm or more when sealing is done with the side coated with the sealing layer on the side coated with the sealing layer (B/B). 
     
     
         6 . The coated paper according to  claim 1 , characterized in that the coated paper has a cold seam sealing strength of 1.5 N/15 mm or more when sealing is done with the side coated with the sealing layer on the side not coated with the sealing layer (B/A). 
     
     
         7 . The coated paper according to ah  claim 1 , characterized in that the coating color layer has a grammage of less than 10 g/m 2 . 
     
     
         8 . The coated paper according to  claim 1 , characterized in that the heat-sealable material is selected from the group of thermoplastic polymers, more-particularly polyolefins, vinyl acetate polymers, vinyl acetate copolymers, polyvinyl alcohols, grafted polyvinyl alcohols, ethylene vinyl alcohols, (meth)acrylate (co)polymers, me u ethylene acrylic acid copolymers and styrene acrylate copolymers, acrylic acid esters, (carboxylated) styrene-butadiene copolymers, polyurethanes, carbohydrates and carbohydrate derivatives, aqueous synthetic resin dispersions, thermoplastic ethylene copolymers, and/or natural rubber. 
     
     
         9 . The coated paper according to  claim 1 , characterized in that the coated paper has a burst pressure according to Mullen of more than 150 kPa. 
     
     
         10 . The coated paper according to  claim 1 , characterized in that the coated paper has a longitudinal tensile strength of more than 40 N/15 mm and/or a transverse tensile strength of more than 60 N/15 mm, measured according to ISO 1924-2 (2009). 
     
     
         11 . The coated paper according to  claim 1 , characterized in that the coated paper has a longitudinal elongation at break of >1.5% and/or a transverse elongation at break of >4%, measured according to ISO 1924-2 (2009). 
     
     
         12 . The coated paper according to  claim 1 , characterized in that the coated paper has a thickness of less than 60 μm. 
     
     
         13 . The coated paper according to  claim 1 , characterized in that a precoat layer comprising a polymer binder or a surface pigmentation comprising a polymer binder and/or addition of pigments is present between the base paper and the coating color. 
     
     
         14 . A process for producing a coated paper according to  claim 1 , characterized in that an aqueous suspension comprising the starting materials of the coating color layer is applied to the base paper, wherein the aqueous coating suspension has a solids content of 5 to 50 wt % and is applied by a curtain coating process. 
     
     
         15 . (canceled) 
     
     
         16 . A packaging comprising a coated paper according to  claim 1 . 
     
     
         17 . The packaging according to  claim 16 , wherein the packaging has a cold seam sealing strength of 3 N/15 mm or more when sealing is done with the side coated with the sealing layer on the side coated with the sealing layer (B/B). 
     
     
         18 . The packaging according to  claim 16 , wherein the packaging has a cold seam sealing strength of 1.5 N/15 mm or more when sealing is done with the side coated with the sealing layer on the side not coated with the sealing layer (B/A). 
     
     
         19 . The coated paper according to  claim 1 , characterized in that the base paper comprises fibers from agricultural residue. 
     
     
         20 . The coated paper according to  claim 13 , characterized in that the precoat polymer layer is starch, the surface pigmentation polymer binder is starch and/or latexes, and/or, the pigment is CaCO 3 . 
     
     
         21 . A process for producing a coated paper according to  claim 14 , characterized in that an aqueous suspension comprising the starting materials of the coating color layer is applied to the base paper, wherein the aqueous coating suspension has a solids content of 10 to 30 wt % and is applied by a double curtain coating process with an operating speed of the coating plant of at least 200 m/min.