Water-resistant mineral-coated cellulose-based substrate
AssigneeStora Enso OYJ
InventorsSusanne Hansson, Raija Bådenlid
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Abstract
The present invention relates to a water-resistant mineral-coated cellulose-based substrate, comprising a cellulose-based substrate, and a mineral-coating layer disposed on at least one surface of said substrate, said mineral coating comprising 50-95 wt % of a particulate mineral and 5-50 wt % of a water-dispersible binder based on the total dry weight of the mineral coating, and wherein said mineral-coating layer has been subjected to grafting with a fatty acid halide. The invention further relates to a method for manufacturing the water-resistant mineral-coated cellulose-based substrate.
Claims16
A water-resistant mineral-coated cellulose-based substrate, comprising
- a cellulose-based substrate, and
- a mineral-coating layer disposed on at least one surface of said substrate,
- said mineral-coating layer comprising:
- 50-95 wt % of a particulate mineral, and
- 5-50 wt % of a water-dispersible binder
- based on a total dry weight of the mineral-coating layer, and
- wherein said mineral-coating layer has been subjected to grafting with a fatty acid halide,
- wherein the cellulose-based substrate is a web or sheet having a first main surface and a second main surface,
- wherein the mineral-coating layer is disposed on the first main surface of the substrate,
- wherein no mineral-coating layer is disposed on the second main surface of the substrate, and
- wherein the second main surface has also been subjected to grafting with a fatty acid halide.
A method for manufacturing a water-resistant mineral-coated cellulose-based substrate, said method comprising:
- a) providing a cellulose-based substrate;
- b) applying an aqueous mineral-coating dispersion to the cellulose-based substrate and drying the coating dispersion to form a mineral-coating layer, wherein the aqueous mineral-coating dispersion is an aqueous dispersion comprising 50-95 wt % of a particulate mineral and 5-50 wt % of a water-dispersible binder based on a total dry weight of the mineral coating dispersion;
- and
- c) subjecting the dry mineral-coating layer to grafting with a fatty acid halide to obtain a water-resistant mineral-coated cellulose-based substrate,
- wherein the cellulose-based substrate is a web or sheet having a first main surface and a second main surface,
- wherein the mineral-coating layer is disposed on the first main surface of the substrate,
- wherein no mineral-coating layer is disposed on the second main surface of the substrate, and
- wherein the second main surface has also been subjected to grafting with a fatty acid halide.
Dependencies are inferred from the claim text.