Repulpable corrugated boxboard
AssigneeLe Groupe Recherche I.D. Inc.
InventorSerge Berube
Life of this patent
Estimating the term…
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 C14-C18 fatty acid complex of a metal ion having an oxidation state of at least 3, such as chromium.
Claims22
A composition for forming a water-resistant, grease resistant, water vapor permeable coating on a porous paper sheet material, comprising:
- i) a styrene-acrylate copolymer,
- ii) a C14-C18 fatty acid complex of a metal ion having an oxidation state of at least 3, and
- iii) an aqueous vehicle.
A repulpable coated paperboard liner for use in corrugated paperboard packaging manufacture comprising:
- a) a paperboard sheet having opposed first and second surfaces,
- b) a water-resistant, grease resistant, water vapor permeable coating on at least one of said surfaces,
- said coating comprising a styrene-acrylate copolymer and a C14-C18 fatty acid complex of a metal ion having an oxidation state of at least 3.
A method of producing a repulpable coated paperboard liner for use in corrugated paperboard packaging manufacture comprising:
- a) providing a paperboard sheet having opposed first and second surfaces,
- b) coating at least one of said surfaces with a composition comprising:
- i) a styrene-acrylate copolymer,
- ii) a C14-C18 fatty acid complex of a metal ion having an oxidation state of at least 3, and
- iii) an aqueous vehicle, and
- c) drying said composition to form a repulpable, water-resistant, grease resistant, water vapor permeable coated liner board.
A repulpable corrugated paperboard comprising:
- a) first and second coated paperboard liners and a corrugated medium therebetween, each of said liners having opposed inner and outer surfaces, and said corrugated medium being adhesively secured to said inner surfaces,
- b) at least one of said outer surfaces having a water-resistant, grease-resistant, water vapor permeable coating thereon, and
- c) said corrugated medium being water vapor impermeable.
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.
Dependencies are inferred from the claim text.