Repulpable corrugated boxboard
AssigneeLe Groupe Recherche I.D. Inc.
InventorSerge Berube
Life of this patent
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Abstract
A coating composition for the linerboard of corrugated paperboard provides water and grease resistance but is water vapor permeable, and thus permits a different mode of manufacture of corrugated paperboard when aqueous adhesives are employed in the assembly of the linerboards and corrugated medium; in particular the linerboards may be coated with the coating composition prior to assembly of the corrugated paperboard because the water vapor permeable coating permits escape of the water of the aqueous adhesive, during drying of the assembled components of the corrugated paperboard; the coating composition employs a styrene-acrylate copolymer and a C.sub.14 -C.sub.18 fatty acid complex of a metal ion having an oxidation state of at least 3, such as chromium.
Claims22
A method of producing a repulpable corrugated paperboard comprising:
- a) providing paperboard sheet having opposed first and second surfaces,
- b) coating at least one of said surfaces with a coating composition which dries to form a water-resistant, grease resistant, water vapor permeable coating,
- c) drying said composition to form a repulpable, water-resistant, grease-resistant, water vapor permeable coated paperboard liner,
- d) adhesively securing a water vapor impermeable corrugating medium between a pair of paperboard liners, at least one of said liners being a said coated paperboard liner, with a water-based adhesive, and
- e) curing said adhesive, allowing water vapor of said water-based adhesive to escape through said at least one liner, wherein said coating causes said liner to have a water vapor permeability that is high enough to permit said adhesive to dry by allowing said water vapor to escape.
A method of producing a repulpable corrugated paperboard comprising:
- a) providing paperboard sheet having opposed first and second surfaces,
- b) coating at least one of said surfaces with a coating composition which dries to form a water-resistant, grease resistant, water vapor permeable coating,
- c) drying said composition to form a repulpable, water-resistant, grease-resistant, water vapor permeable coated paperboard liner,
- d) adhesively securing, a water vapor impermeable corrugating medium between a pair of paperboard liners, at least one of said liners being a said coated paperboard liner, with a water-based adhesive, and
- e) curing said adhesive, allowing water vapor of said water-based adhesive to escape through said at least one liner, wherein said coating composition in b) comprises:
- i) a copolymer of butyl acrylate and styrene,
- ii) a C.sub.14 -C.sub.18 fatty acid complex of a metal ion having an oxidation state of at least 3, and
- iii) an aqueous vehicle.
Dependencies are inferred from the claim text.