Compostable paperboard for pressware products

Patent metadata

Field	Value
Publication number	US-12305337-B2
Application number	US-202217568049-A
Country	US
Kind code	B2
Filing date	Jan 4, 2022
Priority date	Mar 8, 2021
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

Pressware products made from paperboard and methods for making same. The product can include a paperboard substrate and a compostable barrier coating, as determined by ASTM D6868-19, that is at least partially disposed on the paperboard substrate. The product can also include a paperboard substrate and a first compostable coating at least partially disposed on the paperboard substrate. The first compostable coating can include clay particles and less than 50 wt % binder, based on the total weight of the first compostable coating, wherein the binder is compostable, as determined by ASTM D6868-19. A second compostable barrier coating, as determined by ASTM D6868-19, can be at least partially disposed on the first compostable coating. The resulting pressware product is compostable, as determined by ASTM D6868-19.

First claim

What is claimed is:

1. A pressware product made from paperboard, comprising:
a paperboard substrate; and.
a compostable barrier coating, as determined by ASTM D6868-19, that is at least partially disposed on the paperboard substrate, the compostable barrier coating comprising:
at least 50 wt % one or more non-compostable materials selected from the group consisting of clay, silica, calcium carbonate, talc, titanium dioxide, and thermoplastic polymers, and
less than 50 wt % binder, based on the total weight of the compostable barrier coating, wherein the binder is a biodegradable polyester, and

wherein the pressware product is compostable, as determined by ASTM D6868-19.

2. The pressware product of claim 1 , wherein the biodegradable polyester is selected from the group consisting of polyhydroxyalkanoate, polybutylene succinate, polycaprolactone, and polybutylene adipate terephthalate.

3. The pressware product of claim 1 , wherein the biodegradable polyester is polyhydroxyalkanoate.

4. The pressware product of claim 1 , wherein the compostable barrier coating has a melt temperature greater than 250° F.

5. The pressware product of claim 1 , wherein the product is a plate, tray, platter, bowl or cutting board.

6. The pressware product of claim 1 , wherein the paperboard substrate has a thickness of 12 to 22 mils.

7. A pressware product made from paperboard, comprising:
a paperboard substrate;
a first compostable barrier coating at least partially disposed on the paperboard substrate, the first compostable barrier coating comprising at least 50 wt % clay particles, and less than 50 wt % binder, based on the total weight of the first compostable barrier coating, wherein the binder is compostable, as determined by ASTM D6868-19; and
a second compostable barrier coating, as determined by ASTM D6868-19 that is at least partially disposed on the first compostable coating,
wherein the pressware product is compostable, as determined by ASTM D6868-19.

8. The pressware product of claim 7 , wherein the binder is a biodegradable polyester.

9. The pressware product of claim 7 , wherein the binder is selected from the group consisting of polyhydroxyalkanoate, polybutylene succinate, polycaprolactone, and polybutylene adipate terephthalate.

10. The pressware product of claim 7 , wherein each of the compostable barrier coatings comprises one or more biodegradable polyesters.

11. The pressware product of claim 7 , wherein the second compostable barrier coating is selected from the group consisting of polyhydroxyalkanoate, polybutylene succinate, polycaprolactone, and polybutylene adipate terephthalate.

12. The pressware product of claim 7 , wherein the binder and the second compostable barrier coating are the same material.

13. The pressware product of claim 7 , wherein the binder and the second compostable harrier coating are not the same material.

14. The pressware product of claim 7 , wherein each of the compostable barrier coatings have a melt temperature greater than 250° F.

15. The pressware product of claim 7 , wherein the product is a plate, tray, platter, bowl or cutting board.

16. The pressware product of claim 7 , wherein the product has an overall thickness of 12 to 22 mils and the paperboard substrate has a thickness of 12 to 22 mils.

17. The pressware product of claim 1 , wherein the paperboard substrate comprises at least 70 wt % recycled fiber derived from pre-consumer products, based on the total weight of the fiber in the paperboard.

18. The pressware product of claim 1 , wherein the paperboard substrate comprises at least 70 wt % recycled fiber derived from post-consumer products, based on the total weight of the fiber in the paperboard.

19. The pressware product of claim 1 , wherein the paperboard substrate is less than 30 wt % virgin fiber, based on the total weight of the fiber in the paperboard.

Assignees

• Gpcp Ip Holdings Llc

Inventors

• Breining Michael A

Classifications

• D21J1/04 Primary

  Pressing · CPC title

• D21J3/12

  of sheets; of diaphragms · CPC title

• D21J1/08 Primary

  Impregnated or coated fibreboard · CPC title