Coated paper and method of making same

Claim 1

A method for the preparation of a uniformly, densely coated paper substrate displaying excellent ink holdout properties, characterized by high bulk, increased brightness and opacity, and a gloss value of at least 50, which method essentially consists of: i. applying a coating of an aqueous top coating composition to at least one surface of a given fibrous cellulosic substrate; ii. said fibrous cellulosic substrate having been prepared to resist penetration of the said aqueous top coating composition; iii. said aqueous top coating composition having a total solids content of at least about 60 percent by weight, and said solids content thereof comprising a major proportion of a paper-coating grade pigment, a minor proportion of a thermoplastic binder and a minor amount of an anti-sticking agent; thence iv. gloss-calendering, temporarily plasticizing and molding said coated substrate by conveying same through a nip formed between a heated polished drum and a resilient backing roll to at least partially coalesce the thermoplastic binder content of the said aqueous top coating composition; v. the temperature of said heated polished drum ranging from between about 82° to 150° C. and the pressure exerted on said coated substrate in said nip ranging from between about 400 to 800 pounds per lineal inch; vi. the amount of water loss from the said top coating in that time interval between the application (i) thereof and the gloss-calendering and molding operation (iv) being less than that amount such as would effect substantial decrease in resultant high gloss; vii. the temperature of the said coated substrate not being elevated to a value substantially above about 60° C. in the said time interval between the application (i) and the gloss-calendering and molding operation (iv); viii. concomitantly, the water content of the said top coating, at the point of entry of the said coated substrate into the said nip, is such that, in the absence of the said minor proportion of anti-sticking agent, the substrate coating would stick to the surface of the said gloss-calendering, heated polished drum; and ix. removing the thus coated and gloss-calendered fibrous cellulosic substrate from contact with the said heated polished drum and resilient backing roll as same emerges from the said nip formed therebetween; x. whereby there is recovered a smooth, molded, polished, high gloss fibrous cellulosic substrate having the high bulk and density characteristics of lightly machine-calendered paper, albeit its said coating is itself dense, uniform and provides excellent ink holdout.

Claim 2

A method for the preparation of a uniformly, densely coated paper substrate displaying excellent ink holdout properties, characterized by high bulk, increased brightness and opacity, and a gloss value of at least 50, which method essentially consists of: i. applying a coating of an aqueous top coating composition to at least one surface of a given fibrous cellulosic substrate; ii. said fibrous cellulosic substrate having been prepared to resist penetration of the said aqueous top coating composition; iii. said aqueous top coating composition having a total solids content of at least about 60 percent by weight, and said solids content thereof comprising a major proportion of a paper-coating grade pigment, a minor proportion of a thermoplastic binder and a minor amount of an anti-sticking agent; thence iv. gloss-calendering, temporarily plasticizing and molding said coated substrate by conveying same through a nip formed between a heated polished drum and a resilient backing roll to at least partially coalesce the thermoplastic binder content of the said aqueous top coating composition; v. the temperature of said heated polished drum ranging from between about 82° to 150° C. and the pressure exerted on said coated substrate in said nip ranging from between about 400 to 800 pounds per lineal inch; vi. the amount of water loss from the said top coating in that time interval between the application (i) thereof and the gloss-calendering and molding operation (iv) being less than that amount such as would effect substantial decrease in resultant high gloss; vii. the temperature of the said coated substrate not being elevated to a value substantially above about 60° C. in the said time interval between the application (i) and the gloss-calendering and molding operation (iv); viii. concomitantly, the water content of the said top coating, at the point of entry of the said coated substrate into the said nip, is such that, in the absence of the said minor proportion of anti-sticking agent, the substrate coating would stick to the surface of the said gloss-calendering, heated polished drum; and ix. removing the thus coated and gloss-calendered fibrous cellulosic substrate from contact with the said heated polished drum and resilient backing roll as same emerges from the said nip formed therebetween; x. whereby there is recovered a smooth, molded, polished, high gloss fibrous cellulosic substrate having the high bulk and density characteristics of lightly machine-calendered paper, albeit its said coating is itself dense, uniform and provides excellent ink holdout.