Cast-coated paper

Abstract

The present invention aims to provide a cast-coated paper having good coated paper quality and printability combined with the property of decomposing hazardous substances upon exposure to light. A cast-coated paper prepared by applying a cast-coating layer based on a pigment and a binder on abase paper and finished by pressing the cast-coating layer in the wet state against a heated cast drum surface and drying it, wherein the cast-coating layer contains 1-30 parts by weight of titanium dioxide having an average secondary particle diameter of 300-2000 nm per 100 parts by weight of the pigment and the titanium dioxide is premixed with a silica sol or alumina sol at a ratio of the titanium dioxide to the silica sol or alumina sol of 2:1-1:2.

1 . A cast-coated paper prepared by applying a cast-coating layer based on a pigment and a binder on a base paper and finished by pressing the cast-coating layer in the wet state against a heated cast drum surface and drying it, wherein the cast-coating layer contains 1-30 parts by weight of titanium dioxide having an average secondary particle diameter of 300-2000 nm per 100 parts by weight of the pigment. 
     
     
         2 . The cast-coated paper of  claim 1 , characterized in that the cast-coating layer contains 5-40 parts by weight of an organic binder per 100 parts by weight of the pigment and that the organic binder includes 50% by weight or more of a copolymer latex. 
     
     
         3 . The cast-coated paper of  claim 1 , characterized in that a copolymer latex having a glass transition temperature of −20 to 40° C. is used as a binder in the cast-coating layer. 
     
     
         4 . A cast-coated paper of  claim 1 , wherein the titanium dioxide is premixed with a silica sol or alumina sol. 
     
     
         5 . The cast-coated paper of  claim 4 , characterized in that the premixing is performed at a ratio of the titanium dioxide to the silica sol or alumina sol of 2:1-1:2. 
     
     
         6 . The cast-coated paper of  claim 1 , which has a sheet gloss of 80% or more on the cast-coated surface as determined according to JIS-P8142. 
     
     
         7 . The cast-coated paper of  claim 1 , characterized in that the titanium dioxide has a primary particle diameter of 5-100 nm. 
     
     
         8 . The cast-coated paper of  claim 1 , characterized in that it is cast-finished by the rewet cast coating method in which the coating layer in the wet state is once dried and then rewetted with a rewetting liquid. 
     
     
         9 . A tissue carton or a tissue box prepared from the cast-coated paper of  claim 1 . 
     
     
         10 . The cast-coated paper of  claim 4 , which has a sheet gloss of 80% or more on the cast-coated surface as determined according to JIS-P8142. 
     
     
         11 . The cast-coated paper of  claim 4 , characterized in that the titanium dioxide has a primary particle diameter of 5-100 nm. 
     
     
         12 . The cast-coated paper of  claim 4 , characterized in that it is cast-finished by the rewet cast coating method in which the coating layer in the wet state is once dried and then rewetted with a rewetting liquid. 
     
     
         13 . A tissue carton or a tissue box prepared from the cast-coated paper of  claim 4 .