Coated printable substrates providing higher print quality and resolution at lower ink usage

摘要

An article in the form of a paper substrate having a water-swellable substrate coating on at least one of the first and second surfaces at a thickness of less than about 10 microns and. The substrate coating has an amount of a coating pigment sufficient to impart a Parker Print Smoothness value of at least about 4 to the at least one surface and is dispersed in a water-swellable coating pigment binder matrix in a coating pigment to binder matrix weight ratio of at least about 2:1. The coating pigment has larger porous coating pigment particles, and smaller coating pigment particles in a weight ratio of at least about 0.2:1. The substrate coating provides an ink-receptive porous surface. Also, a method for preparing such coated paper substrates, as well as a method for printing an image on the coated paper substrate with an inkjet printer using a lower ink usage level.

主权项

1. An article comprising:
a paper substrate having a first surface and a second surface, wherein the paper substrate has a Hercules Sizing Test (HST) value of up to about 50 seconds as measured using the procedure of TAPPI standard method T-530 pm-89; and a water-swellable substrate coating on at least one of the first and second surfaces which has a thickness of less than about 10 microns and provides an ink-receptive porous surface, wherein the substrate coating comprises:
a water-swellable coating pigment binder matrix, wherein the binder matrix comprises a water-soluble polymer binder and a polymer latex binder in a weight ratio of at least about 1:1 and which have been crosslinked; andan amount of a coating pigment sufficient to impart a Parker Print Smoothness value as measured by TAPPI test method T-555 om-99 of at least about 4 to the at least one of the first and second surfaces which is dispersed in the binder matrix in a weight ratio of coating pigment to binder matrix of at least about 2:1, and wherein the coating pigment comprises:
larger porous coating pigment particles having a particle size above about 1 micron and an effective pore volume of at least about 0.1 cc/gm, andsmaller coating pigment particles having a particle size of about 1 micron or less;wherein the larger porous coating pigment particles to smaller coating pigment particles are in a weight ratio of least about 0.2:1.