MULTI-FUNCTIONAL PAPER FOR ENHANCED PRINTING PERFORMANCE
Coated substrates include a substrate coated with a coating composition comprising a metal oxide, a binder and optionally a mordant and a crosslinker for the binder. The substrate may be paper, such as commodity paper, and the metal oxide may be a fumed metal oxide or a colloidal metal oxide. The coating may be non-glossy and may be applied at a low coat weight. Methods for making coated substrates are also disclosed. The coating may be applied to the substrate during manufacture of the substrate, for example the coating may be applied to paper using a size-press machine during its manufacture.
1 . A coated substrate comprising a substrate coated with a coating at a coat weight of less than about 0.8 g coating/m 2 substrate, the coating comprising a metal oxide.
2 . The coated substrate of claim 1 , wherein the coated substrate has a specular gloss of less than about 15% at 60°.
3 . The coated substrate of claim 1 , wherein the metal oxide comprises fumed silica, and the coating further comprises polyvinyl alcohol, poly(diallyl dimethyl ammonium chloride) and glyoxyl.
4 . The coated substrate of claim 1 , wherein the substrate comprises a paper.
5 . The coated substrate of claim 4 , wherein the substrate comprises a commodity paper.
6 . The coated substrate of claim 1 , wherein the metal oxide comprises a fumed metal oxide.
7 . The coated substrate of claim 1 , wherein the metal oxide comprises at least one of fumed silica, colloidal silica, fumed alumina and combinations thereof.
8 . The coated substrate of claim 1 , wherein the metal oxide is doped with a different metal oxide.
9 . The coated substrate of claim 8 , wherein the metal oxide comprises alumina doped silica.
10 . The coated substrate of claim 1 , wherein the coat weight is from about 0.05 g coating/m 2 substrate to about 0.5 g coating/m 2 substrate.
11 . The coated substrate of claim 1 , wherein the coat weight is less than about 0.2 g coating/m 2 substrate.
12 . The coated substrate of claim 1 , wherein the coating provides less than about 0.5 g metal oxide/m 2 substrate.
13 . A recording medium comprising the coated substrate of claim 1 and further comprising an image printed onto the coated substrate, wherein the image shows an improved color gamut of at least about 5% compared to the same image printed on the same substrate without the coating.
14 . The recording medium of claim 13 , wherein the coated substrate has a specular gloss of less than about 15% at 60°.
15 . A recording medium comprising the coated substrate of claim 1 and further comprising an image printed onto the coated substrate, wherein the image shows an improved trait selected from an improved wick of at least about 5%; an improved bleed of at least about 5%; an improved optical density of at least about 5%; and combinations thereof, when compared to the same image printed on the same substrate without the coating.
16 . A coated substrate comprising a substrate coated with a coating comprising a metal oxide, the coated substrate having a specular gloss of less than about 15% at 60°.
17 . The coated substrate of claim 16 , wherein the coat weight is less than about 5 g coating/m 2 substrate.
18 . The coated substrate of claim 16 , wherein the coat weight is less than about 0.2 g coating/m 2 substrate.
19 . The coated substrate of claim 16 , wherein the metal oxide comprises fumed silica, and the coating further comprises polyvinyl alcohol, poly(diallyl dimethyl ammonium chloride) and glyoxyl.
20 . The coated substrate of claim 16 , wherein the coating provides less than about 4 g metal oxide/m 2 substrate.
21 . The coated substrate of claim 20 , wherein the coating provides less than about 0.5 g metal oxide/m 2 substrate.
22 . A recording medium comprising the coated substrate of claim 16 and further comprising an image printed onto the coated substrate, wherein the image shows an improved color gamut of at least about 5% compared to the same image printed on the same substrate without the coating.
23 . The recording medium of claim 22 , wherein the coated substrate has a coat weight of less than about 0.8 g coating/m 2 substrate.
24 . A recording medium comprising the coated substrate of claim 16 and further comprising an image printed onto the coated substrate, wherein the image shows an improved trait selected from an improved wick of at least about 5%; an improved bleed of at least about 5%; an improved optical density of at least about 5%; and combinations thereof, when compared to the same image printed on the same substrate without the coating.
25 . A method of making a coated paper comprising:
(a) using a size press to apply a coating comprising a metal oxide to a paper at a coat weight of less than about 5 g coating/m 2 paper; and
(b) producing a coated paper having a specular gloss of less than about 15% at 60°.
26 . The method of claim 25 , further comprising calendaring the paper after application of the coating.
27 . The method of claim 25 , wherein the size press is in-line with a paper making machine.
28 . The method of claim 25 , wherein the metal oxide comprises fumed silica, and the coating further comprises polyvinyl alcohol, poly(diallyl dimethyl ammonium chloride) and glyoxyl.
29 . The method of claim 25 , wherein the metal oxide is selected from fumed silica, colloidal silica, fumed alumina and combinations thereof.
30 . The method of claim 25 , wherein the coat weight is from about 0.05 g coating/m 2 substrate to about 0.5 g coating/m 2 substrate.
31 . The method of claim 25 , wherein the coat weight is less than about 0.2 g coating/m 2 substrate.
32 . The method of claim 25 , wherein the coating provides less than about 0.5 g metal oxide/m 2 substrate.