Compostable paperboard for pressware products
View Patent ↗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.
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.