Biodegradable paper barrier laminate

Patent metadata

Field	Value
Publication number	US-12351377-B2
Application number	US-202117386590-A
Country	US
Kind code	B2
Filing date	Jul 28, 2021
Priority date	Jul 30, 2020
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A biodegradable paper laminate comprising a water-dispersible barrier against permeation.

First claim

What is claimed is:

1. A biodegradable paper barrier laminate comprising:
a) a biodegradable paper layer having an outer surface and an inner surface;
b) a first biodegradable polymeric layer, having a thickness from about 1 μm to about 5 μm and having an outer surface and an inner surface, said outer surface disposed on said inner surface of said paper layer;
c) a water-dispersible barrier layer comprising 96 wt. % to 100 wt. % hydrophilic nanoplatelets comprising sodium cloisite, having an outer surface and an inner surface, said outer surface disposed on said inner surface of said first biodegradable polymeric layer;
d) a second biodegradable polymeric layer having an outer surface and an inner surface, said outer surface disposed on said inner surface of said water-dispersible barrier layer;
wherein each layer and the entire biodegradable paper barrier laminate achieves at least 60% biodegradation within 60 days in the OECD 301B test.

2. The biodegradable paper barrier laminate of claim 1 , wherein the grammage of the biodegradable paper barrier laminate is from about 20 to about 1,000 g/m 2 .

3. The biodegradable paper barrier laminate of claim 1 , wherein the WVTR of the biodegradable paper barrier laminate is from about 0.1 g/m 2 /day to about 100 g/m 2 /day when measured at 40° C., temperature and 50% relative humidity according to the ASTM method F1249-13.

4. The biodegradable paper barrier laminate of claim 1 , wherein the WVTR of the biodegradable paper barrier laminate is from about 0.1 g/m 2 /day to about 200 g/m 2 /day when measured at 38° C., temperature and 90% relative humidity according to the ASTM method F1249-13.

5. The biodegradable paper barrier laminate of claim 1 , wherein the WVTR of the biodegradable paper barrier laminate is from about 0.1 g/m 2 /day to about 200 g/m 2 /day when measured at 40° C., temperature and 50% relative humidity according to the ASTM method F1249-13.

6. The biodegradable paper barrier laminate of claim 1 , wherein the WVTR of the biodegradable paper barrier laminate is from about 0.1 g/m 2 /day to about 200 g/m 2 /day when measured at 40° C., temperature and 50% relative humidity according to the ASTM test method F1249-13.

7. The biodegradable paper barrier laminate of claim 1 , wherein the biodegradable paper barrier laminate is recyclable and exhibits a recyclable percentage of at least 50 percent, as determined by the test method PTS-RH:021/97 (Draft October 2019).

8. The biodegradable paper barrier laminate of claim 1 , wherein the biodegradable paper barrier laminate is recyclable and exhibits an overall “pass” result, as determined by the test method PTS-RH:021/97 (Draft October 2019).

9. The biodegradable paper barrier laminate of claim 1 , wherein the biodegradable paper layer comprises between about 50 percent and about 100 percent, by weight, of natural fibers.

10. The biodegradable paper barrier laminate of claim 1 , wherein the biodegradable paper is made of natural fibers comprising at least one of cellulose-based fibers, bamboo fibers, cotton, abaca, kenaf, sabai grass, flax, esparto grass, straw, jute, hemp, bagasse, milkweed floss fibers, pineapple leaf fibers, wood fibers, pulp fibers, or combinations thereof.

11. The biodegradable paper barrier laminate of claim 1 , wherein the biodegradable paper is made of natural fibers comprising wood fibers or pulp fibers.

12. The biodegradable paper barrier laminate of claim 1 , wherein the biodegradable paper is made of recycled natural fibers as determined by visual inspection.

13. The biodegradable paper barrier laminate of claim 1 , wherein the biodegradable paper is sized and/or machine-glazed on at least one surface, or is glassine, or is vellum paper.

14. The biodegradable paper barrier laminate of claim 1 , wherein the biodegradable paper is made via foam-forming process, a paper-making process replacing water by water-based foam.

15. The biodegradable paper barrier laminate of claim 1 , wherein the average thickness of the second biodegradable polymeric layer is from about 1 μm to about 200 μm.

16. The biodegradable paper barrier laminate of claim 1 , wherein at least one of the first or the second biodegradable polymeric layers comprises different biodegradable polymers.

17. The biodegradable paper barrier laminate of claim 1 , wherein at least one of the first or the second biodegradable polymeric layers comprise more than one biodegradable polymeric sublayer.

18. The biodegradable paper barrier laminate of claim 1 , wherein the biodegradable polymeric layers comprise at least one water insoluble polymer that is at least one of polyhydroxyalkanoate, polybutylene succinate, polybutylene succinate co-adipate, polybutylene adipate-co-terephthalate, polylactic acid, or thermoplastic starch.

19. The biodegradable paper barrier laminate of claim 1 , wherein the biodegradable polymeric layers comprise a water-soluble polymer that is at least one of polyvinyl alcohol, polyethylene oxide, methylcellulose, or sodium alginate.

20. The biodegradable polymeric layers of claim 19 , wherein the water-soluble polyvinyl alcohol is either homopolymer or copolymer, either partially or fully hydrolyzed.

21. The biodegradable polymeric layers of claim 19 , wherein the water-soluble polyvinyl alcohol has an average molecular weight from about 20,000 Da to about 150,000 Da.

22. The biodegradable polymeric layers of claim 19 , wherein the water-soluble polyvinyl alcohol is a homopolymer with a degree of hydrolyzation from about 70% to about 100%.

23. The biodegradable polymeric layers of claim 19 , wherein the water-soluble polyethylene oxide has an average molecular weight from about 50,000 Da to about 400,000 Da.

24. The biodegradable polymeric layers of claim 19 , wherein the water-soluble methylcellulose has an average molecular weight from about 10,000 Da to about 100,000 Da.

25. The biodegradable polymeric layers of claim 19 , wherein the water-soluble methylcellulose is methoxyl substituted from about 18% to about 32% and hydroxy-propoxyl substituted from about 4% to about 12%.

26. The biodegradable polymeric layers of claim 19 , wherein the water-soluble sodium alginate has an average molecular weight from about 10,000 Da to about 240,000 Da.

27. The biodegradable polymeric layers of claim 1 , wherein the biodegradable polymeric layers comprise at least one plasticizer.

28. The biodegradable polymeric layers of claim 27 , wherein the plasticizer is at least one of water, glycerol, sorbitol, propylene glycol (PG), trimethylene glycol (PDO), trimethylolpropane (TMP), methylpropanediol (MPD), 2-methyl-1,3 propanediol (MPO), or mixtures thereof.

29. The biodegradable paper barrier laminate of claim 1 , wherein the water-dispersible barrier layer is distinct from the biodegradable polymeric layers observed via optical microscopy or scanning electron microscopy.

30. The biodegradable paper barrier laminate of claim 1 , wherein the average thickness of the water-dispersible barrier layer is from about 0.1 μm to about 20 μm.

31. The biodegradable paper barrier laminate of claim 1 , wherein the water-dispersible barrier layer comprises more than one water-dispersible barrier sublayer.

32. The water-dispersible barrier layer of claim 1 , wherein the average aspect ratio of the hydrophilic nan

Assignees

• Procter & Gamble

Inventors

• Boswell Emily Charlotte
• Caruso Pier-Lorenzo
• Bolz Uwe

Classifications

• D21H19/82

  superposed {(D21H19/84 takes precedence)} · CPC title

• D21H19/12

  applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds · CPC title

• B65D65/42

  Applications of coated or impregnated materials · CPC title

• B05D2401/20

  Aqueous dispersion or solution · CPC title

• B05D2203/22

  Paper or cardboard · CPC title