Paper sheet material with a plastic-like tactile effect and method for the production thereof

Abstract

The paper sheet material includes a paper substrate having a uniform coating layer on at least one face thereof, the coating layer having a composition with silica and/or a silicone product to impart to the paper material a plastic-like tactile effect and in addition a polymeric component and a mineral component, wherein the polymeric component includes a polyurethane-based polymeric material and a styrene acrylic-based polymeric material, and the mineral component includes kaolin and precipitated calcium carbonate.

1 - 5 . (canceled) 
     
     
         6 . A paper sheet material comprising: a paper substrate having a uniform coating layer on at least one face thereof, said uniform coating layer having a composition comprising silica and/or a silicone product to impart to the paper sheet material a plastic tactile effect and in addition a polymeric component and a mineral component, wherein a dry weight ratio between said mineral component and said silica and/or said silicone product is comprised between 10 and 100, a dry weight ratio between said mineral component and said polymeric component is comprised between 1 and 10, said polymeric component including a polyurethane-based polymeric material and a styrene acrylic-based polymeric material, wherein a dry weight ratio between said polyurethane-based polymeric material and said styrene acrylic-based polymeric material in said polymeric component is comprised between 1 and 5, and said mineral component including kaolin and precipitated calcium carbonate, wherein a dry weight ratio between said kaolin and said precipitated calcium carbonate in said mineral component is comprised between 1 and 10. 
     
     
         7 . The paper sheet material according to  claim 6 , wherein said composition further comprises at least one water-retaining material included among carboxymethyl cellulose, polyvinyl alcohol and casein. 
     
     
         8 . The paper sheet material according to  claim 6 , wherein the dry weight ratio between said mineral component and said water-retaining material is comprised between 50 and 200. 
     
     
         9 . The paper sheet material according to  claim 6 , wherein said paper substrate has a grammage comprised between 90 and 420 g/m 2 . 
     
     
         10 . A method for producing a paper sheet material, the method including the following steps:
 making a paper substrate by a continuous machine for the production of paper, and   preparing a composition comprising silica and/or a silicone product to impart to the paper sheet material a plastic tactile effect and in addition a polymeric component and a mineral component, wherein a polyurethane-based polymeric material and a styrene acrylic-based polymeric material are included in said polymeric component, a dry weight ratio between said polyurethane-based polymeric material and said styrene acrylic-based polymeric material in said polymeric component being comprised between 1 and 5, and kaolin and precipitated calcium carbonate are included in said mineral component, a dry weight ratio between said kaolin and said precipitated calcium carbonate in said mineral component being comprised between 1 and 10, and wherein a uniform layer of said composition is applied by spreading on at least one face of said paper substrate.