Cellulosic structures for high barrier applications

Patent metadata

Field	Value
Publication number	US-2023416993-A1
Application number	US-202318189508-A
Country	US
Kind code	A1
Filing date	Mar 24, 2023
Priority date	Jun 28, 2022
Publication date	Dec 28, 2023
Grant date	—

Abstract

A cellulosic substrate includes a first major side and a second major side opposed from the first major side, a single polyolefin aqueous polymer dispersion barrier layer on the first major side of the cellulosic substrate, and at least one non-polyolefin aqueous polymer dispersion barrier layer between the single polyolefin aqueous polymer dispersion barrier layer and the first major side of the cellulosic substrate.

First claim

What is claimed is:

1 . A cellulosic structure comprising:
a cellulosic substrate comprising a first major side and a second major side opposed from the first major side; a single polyolefin aqueous polymer dispersion barrier layer on the first major side of the cellulosic substrate; and at least one non-polyolefin aqueous polymer dispersion barrier layer between the single polyolefin aqueous polymer dispersion barrier layer and the first major side of the cellulosic substrate.

2 . The cellulosic structure of claim 1 wherein the cellulosic substrate comprises paperboard.

3 . The cellulosic structure of claim 1 wherein the single polyolefin aqueous polymer dispersion barrier layer comprises a polyolefin binder.

4 . The cellulosic structure of claim 3 wherein the single polyolefin aqueous polymer dispersion barrier layer comprises a pigment.

5 . The cellulosic structure of claim 4 wherein a ratio of the polyolefin binder to the pigment is at least 1 to 2.

6 . The cellulosic structure of claim 1 wherein the single polyolefin aqueous polymer dispersion barrier layer has a coat weight, on a dry basis, of at least about 0.5 lb/3000 ft 2 .

7 . The cellulosic structure of claim 1 wherein the non-polyolefin aqueous polymer dispersion barrier layer comprises a non-polyolefin binder.

8 . The cellulosic structure of claim 7 wherein the non-polyolefin binder comprises at least one of a styrene acrylic binder, a styrene-butadiene binder, a vinyl acrylic binder, and a polyester dispersion binder.

9 . The cellulosic structure of claim 7 wherein the non-polyolefin aqueous polymer dispersion barrier layer comprises a pigment.

10 . The cellulosic structure of claim 9 wherein a ratio of the non-polyolefin binder to the pigment is at least 1 to 2.

11 . The cellulosic structure of claim 1 wherein the non-polyolefin aqueous polymer dispersion barrier layer has a coat weight, on a dry basis, of at least about 0.5 lb/3000 ft 2 .

12 . The cellulosic structure of claim 1 further comprising at least one water soluble polymer barrier layer between the single polyolefin aqueous polymer dispersion barrier layer and the first major side of the cellulosic substrate.

13 . The cellulosic structure of claim 12 wherein the water soluble polymer barrier layer comprises a water soluble binder.

14 . The cellulosic structure of claim 13 wherein the water soluble binder comprises at least one of a polyvinyl alcohol binder, a carboxymethylcellulose binder, and an alginate binder.

15 . The cellulosic structure of claim 13 wherein the water soluble polymer barrier layer further comprises a pigment.

16 . The cellulosic structure of claim 15 wherein a ratio of the water soluble binder to the pigment is at least 1 to 1.

17 . The cellulosic structure of claim 12 wherein the at least one water soluble polymer barrier layer has a coat weight, on a dry basis, of at least about 0.5 lb/3000 ft 2 .

18 . The cellulosic structure of claim 1 further comprising a barrier layer on the second major side of the cellulosic substrate.

19 . The cellulosic structure of claim 1 further comprising a non-barrier layer on the second major side of the cellulosic substrate.

20 . The cellulosic structure of claim 1 having a 30-minute-water-Cobb rating of at most about 20 g/m 2 .

21 . The cellulosic structure of claim 1 having a water vapor transmission rate of less than 1000 grams per square meter per day at 38° C./90% RH.

22 . The cellulosic structure of claim 1 having oxygen transmission rate of less than 500 cc per square meter per day at 23° C./0% RH/100% O2.

23 . The cellulosic structure of claim 1 having a 3M kit test value is at least 5.

24 . The cellulosic structure of claim 1 wherein the cellulosic structure has a blocking rating of 2.0 or less.

25 . The cellulosic structure of claim 1 wherein the cellulosic structure is repulpable to an extent that after repulping a percentage of accepts is at least 50%.

26 . A container comprising the cellulosic structure of claim 1 .

Assignees

• Westrock Mwv Llc

Inventors

• Pang Jiebin
• Drucker Taylor A
• Melton Natasha G

Classifications

• D21H19/828 Primary

  two superposed coatings, the first applied being non-pigmented and the second applied being pigmented · CPC title

• D21H19/56

  Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• D21H19/24

  comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• D21H27/10 Primary

  Packing paper (packaging materials of special type or form B65D65/38) · CPC title

• D21H21/16

  Sizing or water-repelling agents · CPC title