# US 2021/0276314 A1 · Coffee stain-resistant cellulosic structures and associated containers and methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0276314 A1 - Document ID: US20210276314A1 - Status: Published application - Kind: A1 - Application number: 17/156,798 - Filed: 2021-01-25 - Published: 2021-09-09 - Earliest claimed: 2020-03-04 - Assignees: WestRock MWV, LLC - Applicants: WestRock MWV, LLC - Inventors: Jiebin Pang; Steven Parker; Natasha G. Melton - Web page: https://patentgrep.com/patent/US20210276314A1 ## CPC - B32B 27/10: of paper or cardboard - D21H 27/10: Packing paper (packaging materials of special type or form B65D65/38) - B32B 27/20: using fillers, pigments, thixotroping agents - B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers} - B65D 3/06: essentially conical or frusto-conical - B65D 3/14: Discs fitting within container end and secured by bending, rolling, or folding operations - D21H 19/52: Cellulose; Derivatives thereof - D21H 19/58: Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof - D21H 19/60: Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters - D21H 19/82: superposed {(D21H19/84 takes precedence)} - D21H 19/824: {two superposed coatings, both being non-pigmented} - D21H 19/828: {two superposed coatings, the first applied being non-pigmented and the second applied being pigmented} - D21H 19/84: on both sides of the substrate - B32B 2250/03: 3 layers - B32B 2250/04: 4 layers - B32B 2255/12: on paper layer - B32B 2255/26: Polymeric coating - B32B 2255/28: Multiple coating on one surface - B32B 2307/4026: within the layer by addition of a colorant, e.g. pigments, dyes - B32B 2307/7265: Non-permeable - B32B 2307/728: Hydrophilic - B32B 2439/02: Open containers - B32B 2439/62: Boxes, cartons, cases - B32B 2439/70: Food packaging - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR - B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES ## Abstract A cellulosic structure including a cellulosic substrate comprising a first major side and a second major side opposed from the first major side, an oil barrier layer on the second major side of the cellulosic substrate, and a water barrier layer on the second major side of the cellulosic substrate, wherein the oil barrier layer is positioned between the cellulosic substrate and the water barrier layer. ## Claims ### Claim 1 A cellulosic structure comprising: a cellulosic substrate comprising a first major side and a second major side opposed from the first major side; an oil barrier layer on the second major side of the cellulosic substrate; and a water barrier layer on the second major side of the cellulosic substrate, wherein the oil barrier layer is positioned between the cellulosic substrate and the water barrier layer. ### Claim 2 (depends on 1) The cellulosic structure of claim 1 wherein the oil barrier layer is hydrophilic or water-soluble. ### Claim 3 (depends on 1) The cellulosic structure of claim 1 wherein the oil barrier layer is adjacent to the water barrier layer. ### Claim 4 (depends on 1) The cellulosic structure of claim 1 wherein the oil barrier layer is adjacent to the cellulosic substrate. ### Claim at position 5 5-7. (canceled) ### Claim 8 (depends on 1) The cellulosic structure of claim 1 wherein the oil barrier layer consists essentially of polyvinyl alcohol. ### Claim at position 7 9-12. (canceled) ### Claim 13 (depends on 1) The cellulosic structure of claim 1 wherein the oil barrier layer further comprises a pigment. ### Claim 14 (depends on 13) The cellulosic structure of claim 13 wherein the pigment comprises at least one of clay and calcium carbonate. ### Claim 15 (canceled) ### Claim 16 (depends on 1) The cellulosic structure of claim 1 wherein the oil barrier layer has a coat weight, on a dry basis, of at least about 0.5 lb/3000 ft2. ### Claim at position 12 17-19. (canceled) ### Claim 20 (depends on 1) The cellulosic structure of claim 1 wherein the water barrier layer comprises a single layer. ### Claim 21 (depends on 1) The cellulosic structure of claim 1 wherein the water barrier layer comprises at least two layers. ### Claim 22 (depends on 1) The cellulosic structure of claim 1 wherein the water barrier layer comprises a binder and a pigment. ### Claim 23 (depends on 22) The cellulosic structure of claim 22 wherein a ratio of the pigment to the binder in the water barrier layer is at most 1:1, by weight. ### Claim 24 (depends on 22) The cellulosic structure of claim 22 wherein a ratio of the pigment to the binder in the water barrier layer is at least about 1:1.5 to about 1:6, by weight. ### Claim 25 (canceled) ### Claim 26 (depends on 22) The cellulosic structure of claim 22 wherein the binder comprises a latex. ### Claim at position 20 27-35. (canceled) ### Claim 36 (depends on 1) The cellulosic structure of claim 1 wherein the water barrier layer has a coat weight, on a dry basis, of at least about 4 lb/3000 ft2. ### Claim at position 22 37-39. (canceled) ### Claim 40 (depends on 1) The cellulosic structure of claim 1 wherein the cellulosic substrate comprises paperboard. ### Claim at position 24 41-47. (canceled) ### Claim 48 (depends on 1) The cellulosic structure of claim 1 having a 30-minute-water-Cobb rating of at most about 20 g/m2. ### Claim at position 26 49-53. (canceled) ### Claim 54 (depends on 1) A container comprising the cellulosic structure of claim 1. ### Claim 55 A container comprising: a side wall having an upper end portion and a lower end portion; and a bottom wall connected to the lower end portion of the side wall, wherein at least the bottom wall comprises a cellulosic structure comprising: a cellulosic substrate; an oil barrier layer on the cellulosic substrate; and a water barrier layer positioned over the oil barrier layer such that the oil barrier layer is positioned between the cellulosic substrate and the water barrier layer. ### Claim at position 29 56-58. (canceled) ### Claim 59 A method for manufacturing a cellulosic structure comprising: applying an oil barrier coating formulation to a cellulosic substrate to form an oil barrier layer, the oil barrier coating formulation comprising at least one of polyvinyl alcohol, carboxymethylcellulose, alginate, and microfibrillated cellulose; and applying a water barrier coating formulation over the oil barrier layer to form a water barrier layer, wherein the oil barrier layer is positioned between water barrier layer and the cellulosic substrate. ### Claim at position 31 60-63. (canceled)