Process for the production of a coated and pressed cellulosic fibrous flat substrate, suitable coating compositions, their production, the coated and pressed substrates and their use as substrates for graphic processes

Abstract

The invention provides a process for the production of a coated and pressed cellulosic fibrous flat substrate of loose, optionally bonded fibers, by application of (M) an aqueous coating composition, containing a binder (B), a white pigment (W) and a dispersant (D), wherein at least a part of the white pigment (W) is (A) a particulate ammonium polyphosphate of crystalline form II of average particle size<40 μm and with a water solubility<10 g/l at 25° C., to the face of the substrate and subjecting to pressure, in particular for the production of coated and pressed substrates of outstanding surface properties, particularly suitable for graphic processing, and of outstanding non-flammability properties, suitable coating compositions, their production, the coated and pressed substrates and their use as substrates for graphic processes, especially printing.

1 . Process for the production of a coated and pressed cellulosic fibrous flat substrate of loose, optionally bonded fibers, by application of 
 (M) an aqueous coating composition, containing a binder (13), a white pigment (W) and a dispersant (D), wherein at least a part of the white pigment (W) is 
 (A) a particulate ammonium polyphosphate of crystalline form II of average particle size<40 μm and with a water solubility<10 μg/l at 25° C.,  
 to the face of the substrate and subjecting to pressure.  
   
     
     
         2 . A process according to  claim 1 , wherein the average particle size of (A) is <25 μm, with no particles exceeding the size of 40 μm.  
     
     
         3 . A process according to  claim 1  or  2 , wherein the cellulosic fibrous substrate is a non-woven substrate selected from a web of paper, paperboard, board or non-woven tissue.  
     
     
         4 . A process according to any one of  claims 1  to  3  for coating and flame-proofing, wherein (A) is present in a concentration efficient for providing a flame-proofing action.  
     
     
         5 . A process according to any one of  claims 1  to  4 , wherein (A) is present in a concentration≧4% by weight of (W).  
     
     
         6 . A process according to any one of  claims 1  to  5 , wherein (W) comprises (A) and a white mineral pigment (P) and/or a melamine (poly)phosphate (L).  
     
     
         7 . A process according to any one of  claims 1  to  6 , wherein (M) further contains one or more further additives selected from 
 (C) which is 
 (C 1 ) at least one optical brightener  
 and/or (C 2 ) at least one dyestuff,  
 
 (E) a thickening agent,  
 (F) at least one resin other than (B)  
 and (G) at least one formulation additive suitable modifying or maintaining the physical form of the composition.  
 
     
     
         8 . A process according to any one of  claims 1  to  7  wherein (G) is selected from 
 (G 1 ) an anti-microbic agent,  
 (G 2 ) a defoamer,  
 (G 3 ) a flow agent  
 and/or (G 4 ) an acid, base and/or buffer for pH-adjustment.  
 
     
     
         9 . A coating composition (M) as defined in  claim 2 .  
     
     
         10 . A coating composition (M) according to  claim 9 , further defined as in any one of  claims 4  to  8 .  
     
     
         11 . A process for the production of a coating composition (M) according to  claim 9  or  10 , wherein (W) is mixed at a temperature≦35° C. with water and optionally (G 3 ), then with (D) and then with (B) and optionally with any further of the components (C), (E), (F) and (G).  
     
     
         12 . A cellulosic fibrous flat substrate of loose, optionally bonded fibers coated with (M) by a process according to any one of  claims 1  to  8 .  
     
     
         13 . A cellulosic fibrous substrate according to  claim 12 , which is a coated paper, paperboard, board or non-woven tissue.  
     
     
         14 . Use of a cellulosic fibrous flat substrate of loose, optionally bonded fibers, coated with (M) by a process according to any one of  claims 1  to  8 , as a substrate for a graphic process.  
     
     
         15 . A process for the production of a cellulosic fibrous flat substrate of loose, optionally bonded fibers, which has been graphically processed, in particular written on, printed and/or graphically processed in any other manner by application of at least one graphic ink pattern to said substrate, and drying, which is characterized in that the substrate used for this purpose is a cellulosic fibrous flat substrate of loose, optionally bonded fibers, coated with (M) according to  claim 12  or  13 .