Coated paper

Abstract

The present disclosure relates to a coated paper product comprising:a paper sheet substrate; anda barrier coating on a first side of the paper sheet substrate, wherein the barrier coating comprises talc and a polyolefin-based binder and wherein the amount of talc in the barrier coating is 15-40 wt-% based on the dry weight of the barrier coating.The present disclosure furthermore relates to a method for producing the coated paper product and a use of the coated paper product.

1 . A coated paper product comprising:
 a paper sheet substrate; and   a barrier coating on the first side of the paper sheet substrate, wherein the barrier coating comprises talc and a polyolefin-based binder and wherein the amount of talc in the barrier coating is 15-40 wt-% based on the dry weight of the barrier coating.   
     
     
         2 . The coated paper product of  claim 1 , wherein the coat weight of the barrier coating is at least 4 g/m 2 . 
     
     
         3 . The coated paper product of  claim 1 , wherein the polyolefin-based binder is a polyethylene (PE)-based binder. 
     
     
         4 . The coated paper product according to  claim 1 , wherein the second side of the paper sheet substrate is free from coating or alternatively is coated only with a single layer print layer comprising pigments or a single layer comprising or consisting of starch. 
     
     
         5 . The coated paper product of  claim 1 , wherein the coated paper product comprises a pre-coating arranged between the paper sheet substrate and the barrier coating. 
     
     
         6 . The coated paper product of  claim 5 , wherein the pre-coating comprises binder and pigment. 
     
     
         7 . The coated paper product of  claim 6 , wherein the binder of the pre-coating is selected from the group consisting of ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic-acid-copolymer (EMAA), maleic acid ethylene copolymer (MAE), vinyl acetate acrylate copolymer (VAcA), styrene-acrylate copolymer (SA) and styrene-butadiene copolymer (SB). 
     
     
         8 . The coated paper product according to  claim 1 , wherein the grammage of the paper sheet substrate is within the range of from 10 to 150 g/m 2 , as measured according to ISO 536: 2020. 
     
     
         9 . The coated paper product according to  claim 1 , wherein the paper sheet substrate is either one of; a machine-glazed (MG) paper, a machine finished (MF) paper, a paper sheet substrate having a stretch in the CD direction of at least 7%, as measured according to the standard method ISO 1924-3: 2005, a glassine paper or a high-density paper (HD-paper). 
     
     
         10 . The coated paper product according to  claim 1 , wherein the paper sheet substrate is an MG paper sheet substrate and has a Gurley porosity of 25 s or more, as measured according to the standard method ISO 5636-5: 2013. 
     
     
         11 . The coated paper product according to  claim 1 , wherein the paper sheet substrate is an MF paper sheet substrate and has a Gurley porosity of 30 s or more, as measured according to the standard method ISO 5636-5: 2013. 
     
     
         12 . The coated paper product according to  claim 1 , wherein the paper sheet substrate has a stretch in the CD direction of at least 7%, as measured according to the standard method ISO 1924-3: 2005 and the Gurley porosity of the paper sheet substrate as measured according to the standard method ISO 5636-5: 2013 is above 15 s. 
     
     
         13 . The coated paper product according to  claim 1 , wherein the paper sheet substrate is a glassine paper or a HD paper and has a grammage of 35-100 g/m 2 , a density of 1000-1400 kg/m 3 , a thickness of 35-55 μm, a Gurley value of above 300 s, a Bendtsen roughness of at least one side of less than 25 ml/min. 
     
     
         14 . (canceled) 
     
     
         15 . A method of producing a coated paper product comprising the steps of:
 providing a paper sheet substrate; and   coating the paper sheet substrate with a barrier coating on a first side of the paper sheet substrate, wherein the barrier coating comprises talc and a polyolefin-based binder and wherein the amount of talc in the barrier coating is 15-40 wt-% based on the dry weight of the barrier coating.   
     
     
         16 . The method of  claim 15 , further comprising the step of:
 coating the paper sheet substrate with a pre-coating prior to coating with the barrier coating so that the pre-coating is arranged between the paper sheet substrate and the barrier coating in the coated paper product.   
     
     
         17 . The method of  claim 15 , wherein the paper sheet substrate is a machine-glazed (MG) paper, a machine finished (MF) paper or wherein the paper sheet substrate has a stretch in the CD direction of at least 7%, as measured according to the standard method ISO 1924-3: 2005. 
     
     
         18 . (canceled) 
     
     
         19 . The coated paper product of  claim 2 , wherein the coat weight of the barrier coating is at least 5-10 g/m 2 . 
     
     
         20 . A packaging material constructed from a coated paper product, the coated paper product comprising:
 a paper sheet substrate; and   a barrier coating on the first side of the paper sheet substrate, wherein the barrier coating comprises talc and a polyolefin-based binder and wherein the amount of talc in the barrier coating is 15-40 wt-% based on the dry weight of the barrier coating.