Gloss coated multifunctional printing paper

Abstract

The invention relates to a gloss coated multifunctional printing paper that can be used with a variety of office printing equipment including inkjet and electrophotographic and to processes of making and using the paper, a paper substrate; and a pigmented composition coated on at least one surface of the substrate, said pigmented coating composition comprising (1) a first pigment having a BET surface area in the range of from about 50 to about 750 m 2 /g; (2) a second pigment having a BET surface area in the range of from about 5 to about 49 m 2 /g; and (3) a polymeric binder, Said coated paper having a coating gloss equal to or greater than about 30% at 75° and a Bristow Absorption length of less than about 180 mm. The coating compositions may contain other additives such as lubricants, optical brighteners and coating rheology modifiers. The coating formulations can be applied to the base stock using any of a large number of coating techniques including application roll with bent blade, rod, air, knife, slot die, curtain spray and gravure. The paper can be used with various inkjet and electrophotographic printing apparatus and techniques.

What is claimed is: 
     
         1 . A coated paper suitable for multifunctional printing comprising:
 a paper substrate; and   a pigmented composition coated on at least one surface of the substrate, said pigmented coating composition comprising (a) a first pigment having a BET surface area in the range of from about 50 to about 750 m 2 /g; (b) a second pigment having a BET surface area in the range of from about 5 to about 49 m 2 /g; and (c) a polymeric binder,   Said coated paper having a coating gloss equal to or greater than about 30% at 75° and a Bristow Absorption length of less than about 180 mm.   
     
     
         2 . A coated paper according to  claim 1  comprising:
 (a) About 40 to about 99 weight % of first pigments based on the total weight of first and second pigments in the coating; 
 (b) About 1 to about 60 weight % of pigments having a BET surface area in the range of from about 5 to about 49 square meters per gram based on the total amount of first and second pigments in the coating; and 
 (C) About 5 to about 40 parts (dry basis) of polymeric binders based on 100 parts(dry basis) of pigments; and 
 
     
     
         3 . A coated paper according to  claim 1  further comprising a lubricant. 
     
     
         4 . A coated paper according to  claim 1  wherein the amount of the lubricant from about 0.5 to about 2 weight % by weight of the coating. 
     
     
         5 . A coated paper according to  claim 1  wherein said Bristow Absorption length is less than about 170 mm. 
     
     
         6 . A coated paper according to  claim 1  wherein said Bristow Absorption length is less than about 160 mm. 
     
     
         7 . A coated paper according to  claim 6  wherein said Bristow Absorption length is less than about 150 mm. 
     
     
         8 . A coated paper according to  claim 1  wherein said coating gloss at 75° is from about 30% to about 80% . 
     
     
         9 . A coated paper according to  claim 1  wherein said coating gloss at 75° is from about 35% to about 75%. 
     
     
         10 . A coated paper according to  claim 10  wherein said coating gloss at 75° is from about 40% to about 65%. 
     
     
         11 . A coated paper according to  claim 1  wherein said first pigment has a BET surface area in the range of from about 60 to about 650 m 2 /g. 
     
     
         12 . A coated paper according to  claim 11  wherein said first pigment has a BET surface area in the range of from about 70 to about 650 m 2 /g. 
     
     
         13 . A coated paper according to  claim 12  wherein said first pigment has a BET surface area in the range of from about 80 to about 650 m 2 /g. 
     
     
         14 . A coated paper according to  claim 1  wherein said second pigment has a BET surface area in the range of from about 6 to about 45 m 2 /g. 
     
     
         15 . A coated paper according to  claim 14  wherein said second pigment has a BET surface area in the range of from about 6 to about 40 m 2 /g. 
     
     
         16 . A coated paper according to  claim 15  wherein said second pigment has a BET surface area in the range of from about 6 to about 35 m 2 /g. 
     
     
         17 . A coated paper according to  claim 1  wherein said substrate has a Gurley Porosity equal to or less than about 60 sec/100 cm 3 . 
     
     
         18 . A coated paper according to  claim 1  wherein said substrate has a Gurley Porosity is from about 1 sec/100 cm 3  about 60 sec/100 cm 3 . 
     
     
         19 . A coated paper according to  claim 1  wherein said substrate has a Gurley Porosity is from about 1 sec/100 cm 3  about 50 sec/100 cm 3 . 
     
     
         20 . A coated paper according to  claim 1  wherein said substrate has a Gurley Porosity is from about 1 sec/100 cm 3  about 45 sec/100 cm 3 . 
     
     
         21 . A coated paper according to  claim 1  wherein said substrate has a Gurley Porosity is from about 1 sec/100 cm 3  about 30 sec/100 cm 3 . 
     
     
         22 . A method of producing a coated paper that comprises steps of
 (a) Preparing an aqueous coating formulation comprising: (i) water, (ii) a first pigment having a BET surface area in the range of from about 50 to about 700 m 2 /g; (iii) a second pigment having a BET surface area in the range of from about 5 to about 49 m 2 /g; and (3) a polymeric binder;   (b) Applying the aqueous coating formulation to one or both surfaces of a paper substrate;   (c) Drying the coated paper; and   (d) Calendaring the dried coated paper to form a form a dried calendared paper having a coating gloss equal to or greater than about 30% at 75° and a Bristow Absorption length of less than about 180 mm.   
     
     
         23 . A method of generating images on a surface of a coated paper in an inkjet or electrophotographic printing apparatus that comprises:
 (a) Incorporating the coated paper of this invention into said apparatus; and   (b) Forming an image on a surface of said coated paper to form a coated paper having an image on a surface thereof.