Paper Coating Composition Containing High Starch Levels

Abstract

Described herein is coating starch composition comprising a starch and a plasticizer, as well as a paper coating composition comprising said coating starch composition, where the paper coating composition contains at least 2% starch, a dry solids content of at least 40%, and a viscosity of less than about 1200 cPs, as well as methods of using and making such compositions, such as, for example, in paper manufacturing processes.

What is claimed is: 
     
         1 . A paper coating composition comprising a coating starch composition, the coating starch composition comprising a starch and a plasticizer, wherein the paper coating composition has a starch and plasticizer solids level of at least 40% dry solids basis; and wherein the plasticizer is a starch-derived syrup having a dextrose equivalency of about 40 to about 75, wherein said composition contains at least about 2%, from about 2% to about 30%. 
     
     
         2 . The paper coating composition of  claim 1 , wherein the composition has (i) a viscosity about 100 to about 1200 cPs, and a solids content of at least 40% dry solids basis, or (ii) a viscosity of about 300 to about 600 cPs and a solids content of at least 60% dry solids basis; and, optionally, wherein the viscosity is measured on a Brookfield Viscometer at 20 rpm at 18.3° C. 
     
     
         3 . The paper coating composition of  claim 1 , wherein said composition contains from 2 to 20 parts of the starch and from 5 to 35 parts of the plasticizer. 
     
     
         4 . The paper coating composition of  claim 1 , wherein said composition further comprises (i) a pigment, a latex, or a mixture thereof; or (ii) about 100 parts pigment and about 10 to about 25 parts latex. 
     
     
         5 . The paper coating starch composition of  claim 1 , wherein said plasticizer is a corn syrup selected from maltose corn syrup, high fructose corn syrup, and a mixture thereof. 
     
     
         6 . The paper coating starch composition of  claim 1 , wherein the starch is a modified starch selected from a nonionic starch, an anionic starch, an amphoteric starch, an etherified starch, an acetylated starch, a sulfonated starch, and a mixture of any two or more of the foregoing. 
     
     
         7 . The paper coating starch composition of  claim 1 , wherein the starch is selected from corn starch, dent corn starch, waxy corn starch, wheat starch, potato starch, tapioca starch, pea starch, sorghum starch, manioc starch, sago starch, rice starch, and a mixture of any two or more of the foregoing.