Coating composition for printing paper

A print medium for inkjet printing comprising:

• a base paper;
• a coating layer disposed on a surface of the base paper, wherein the coating layer comprises about 5.0 wt % to about 50 wt % of a porous clay comprising an alumina-silicate that is acid etched, the porous clay having a surface area from about 100 m2/g to about 400 m2/g;
• and
• about 0.1 wt % to about 10.0 wt % of an ink pigment fixation agent comprising a metallic salt and disposed at a surface of the coating layer,
• wherein the coating layer has a pH of from 5 to 8.

A coating composition for a base paper, comprising:

• about 5.0 wt % to about 50 wt % of a porous clay comprising an alumina-silicate that is acid etched;
• and
• about 0.1 wt % to about 10% wt % of an ink pigment fixation agent comprising a metallic salt;
• wherein the porous clay has a surface area from about 100 m2/g to about 400 m2/g;
• and wherein the coating composition further comprises about 50 wt % to about 85 wt % of a pigment.

A coating composition of for a base paper, comprising:

• about 10.0 wt % to about 25.0 wt % of a porous clay comprising an alumina-silicate that is acid etched;
• about 0.5 wt % to about 5.0 wt % of an ink pigment fixation agent comprising a metallic salt;
• about 50 wt % to about 85% of a pigment;
• about 1.0 wt % to about 25 wt % of a polymeric binder;
• and
• about 0.01 wt % to about 5.0 wt % of a surfactant;
• wherein the porous clay has a surface area from about 100 m2/g to about 400 m2/g.