US 12,305,337 B2
Compostable paperboard for pressware products
Michael A. Breining, Neenah, WI (US)
Assigned to GPCP IP HOLDINGS LLC
Filed by GPCP IP Holdings LLC, Atlanta, GA (US)
Filed on Jan. 4, 2022, as Appl. No. 17/568,049.
Claims priority of provisional application 63/157,973, filed on Mar. 8, 2021.
Prior Publication US 2022/0282429 A1, Sep. 8, 2022
Int. Cl. C08B 15/02 (2006.01); D21J 1/04 (2006.01); D21J 1/08 (2006.01); D21J 3/12 (2006.01)
CPC D21J 1/08 (2013.01) [D21J 1/04 (2013.01); D21J 3/12 (2013.01)] 19 Claims
 
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.