COATED SUBSTRATE
A substrate coated with a first coating composition comprising an alcohol-based binder and an inorganic particulate material and a second coating composition comprising a latex binder and a phyllosilicate, and methods for making said coated substrate.
1 . A substrate coated with:
a first coating comprising an alcohol-based binder and an inorganic particulate material; and
a second coating comprising a latex binder and a phyllosilicate;
2 . The substrate according to claim 1 , wherein the substrate is paper.
3 . The substrate according to claim 1 , wherein the alcohol-based binder is polyvinyl alcohol.
4 . The substrate according to claim 1 , wherein the inorganic particulate material comprises an alkaline earth metal carbonate or sulphate, an aluminosilicate, talc, perlite, diatomaceous earth, magnesium hydroxide, aluminum trihydrate or a combination thereof.
5 . The substrate according to claim 1 , wherein the latex binder is a styrene butadiene binder.
6 . The substrate according to claim 1 , wherein the phyllosilicate is selected from clays, kaolin, talc, mica, chlorite, pyrophyllite, serpentine and combinations thereof.
7 . The substrate according to claim 1 , wherein the inorganic particulate material in the first coating has a shape factor equal to or greater than about 10.
8 . The substrate according to claim 1 , wherein the inorganic particulate material and alcohol-based binder are present in the first coating in a weight ratio of from about 5:1 to about 1:10.
9 . The substrate according to claim 1 , wherein the first coating has a coat weight equal to or less than about 30 gsm (g/m 2 ).
10 . The substrate according to claim 1 , wherein the total coat weight of the first and second coatings is equal to or less than about 50 gsm (g/m 2 ).
11 . The substrate according to claim 1 , wherein the substrate has a moisture vapour transmission rate (MVTR) equal to or less than about 200 gam (g/m 2 ) per day.
12 . (canceled)
13 . A method of coating a substrate comprising coating the substrate with a first coating composition and a second coating composition, wherein
the first coating composition comprising an alcohol-based binder and an inorganic particulate material, and
the second coating composition comprises a latex binder and a phyllosilicate.
14 . The method of claim 13 , wherein the first and second coating compositions are applied sequentially to the substrate.
15 . The method of claim 13 , wherein the substrate comprises a first coating comprising an alcohol-based binder and an inorganic particulate material and a second coating comprising a latex binder and a phyllosilicate.
16 . The substrate according to claim 1 , wherein the phyllosilicate and latex binder are present in the second coating in a weight ratio of from about 5:1 to about 1:10.
17 . The substrate according to claim 1 , wherein the the phyllosilicate in the second coating has a shape factor equal to or greater than about 10.
18 . The substrate according to claim 1 , wherein the second coating has a coat weight equal to or less than about 30 gam (g/m 2 ).
19 . The substrate according to claim 4 , wherein the inorganic particulate material comprises calcium carbonate, magnesium carbonate, dolomite, or gypsum.
20 . The substrate according to claim 4 , wherein the inorganic particulate material comprises hydrous kandite clay, kaolin, halloysite clay, ball day, or anhydrous (calcined) kandite day comprising metakaolin, fully calcined kaolin, or mica.
21 . The substrate according to claim 1 , wherein the substrate has an oil vapour transmission rate (OVTR) equal to or less than about 200 gsm (g/m 2 ) per day.