Patent ID: 8586156

Claim:
An article comprising: a paper substrate having a first surface and a second surface; and an acid-resistant water-swellable substrate coating on at least one of the first and second surfaces which provides an ink-receptive porous surface, wherein the substrate coating comprises: an acid-resistant water-swellable crosslinked polymer coating pigment binder matrix; and an amount of an acid-resistant coating pigment sufficient to impart a Parker Print Smoothness value of at least about 4 to the at least one of the first and second surfaces and which is dispersed in the binder matrix, wherein the acid-resistant coating pigment comprises from about 30 to 100% larger coating pigment particles having a mean particle size above about 4 microns in diameter; wherein the acid-resistant coating pigment comprises one or more of: clay, kaolin, talc, calcined clay, alumina, titanium dioxide, barium sulfate, bentonite clay, or absorptive plastic pigments, wherein the substrate coating has a weight ratio of the acid-resistant coating pigment to binder matrix in the range of about 2:1 to about 20:1.