Primer compositions

Abstract

The present disclosure is drawn to primer compositions which can include a binder including polyvinyl alcohol, starch nanoparticles, and a polymer latex dispersion. The primer competitions can also include a wax, a cationic salt, and water.

What is claimed is: 
     
         1 . A primer composition, comprising:
 5 wt % to 70 wt % of a binder including polyvinyl alcohol, starch nanoparticles, and a polymer latex dispersion;   a wax;   a cationic salt; and   water.   
     
     
         2 . The primer composition of  claim 1 , wherein the polymer latex dispersion is selected from an SBR-based latex dispersion, a cationic acrylate latex disperison, a polyvinyl acetate latex dispersion, and combinations thereof. 
     
     
         3 . The primer composition of  claim 2 , wherein the starch nanoparticles are crosslinked starch nanoparticles. 
     
     
         4 . The primer composition of  claim 1 , wherein the cationic salt is present in an amount from 10 wt % to 50 wt % of all dry components of the primer composition. 
     
     
         5 . The primer composition of  claim 1 , wherein the cationic salt comprises a cation of a metal selected form the group consisting of sodium, calcium, copper, nickel, magnesium, zinc, barium, iron, aluminum and chromium. 
     
     
         6 . The primer composition of  claim 1 , wherein the polymer latex dispersion is present in an amount from 10 wt % to 70 wt % of all dry components of the primer composition. 
     
     
         7 . The primer composition of  claim 6 , wherein the polyvinyl alcohol, starch nanoparticles, polymer latex dispersion, wax, and cationic salt make up at least 80 wt % of all dry components of the primer composition. 
     
     
         8 . The primer composition of  claim 1 , wherein the polyvinyl alcohol is a mixture of two different polyvinyl alcohols with different weight-average molecular weights. 
     
     
         9 . The primer composition of  claim 1 , wherein the primer composition further comprises an inorganic pigment in an amount of about 5 wt % or less of all dry components of the primer composition. 
     
     
         10 . A method of coating a media substrate, comprising applying a primer composition to a media substrate, wherein the primer composition comprises:
 from 5 wt % to 70 wt % binder including polyvinyl alcohol, starch nanoparticles, and a polymer latex dispersion;   a wax;   cationic salt; and   water.   
     
     
         11 . The method of  claim 10 , wherein the polymer latex dispersion is present in an amount from 10 wt % to 70 wt % of all dry components of the primer composition, and wherein the polyvinyl alcohol, starch nanoparticles, polymer latex dispersion, wax, and cationic salt make up at least 80 wt % of all dry components of the primer composition. 
     
     
         12 . The method of  claim 10 , wherein the starch nanoparticles are crosslinked starch nanoparticles. 
     
     
         13 . A coated media substrate, comprising:
 a media substrate; and   an ink-receiving primer layer coated on a surface of the media substrate, the primer layer comprising:
 from 5 wt % to 90 wt % binder including polyvinyl alcohol, starch nanoparticles, and a polymer latex dispersion; 
 a wax; and 
 a cationic salt. 
   
     
     
         14 . The coated media substrate of  claim 13 , wherein the media substrate is a smooth, nonporous offset media substrate. 
     
     
         15 . The coated media substrate of  claim 13 , wherein the starch nanoparticles are crosslinked starch nanoparticles, wherein the polymer latex dispersion is present in an amount from 10 wt % to 70 wt % of all dry components of the primer layer, and wherein the polyvinyl alcohol, starch nanoparticles, polymer latex dispersion, wax, and cationic salt make up at least 80 wt % of all dry components of the primer layer.