US 12,351,377 B2
Biodegradable paper barrier laminate
Emily Charlotte Boswell, Cincinnati, OH (US); Pier-Lorenzo Caruso, Frankfurt am Main (DE); and Uwe Bolz, Tutzing (DE)
Assigned to The Procter & Gamble Company, Cincinnati, OH (US)
Filed by The Procter & Gamble Company, Cincinnati, OH (US)
Filed on Jul. 28, 2021, as Appl. No. 17/386,590.
Claims priority of provisional application 63/058,653, filed on Jul. 30, 2020.
Prior Publication US 2022/0033158 A1, Feb. 3, 2022
Int. Cl. B65D 65/42 (2006.01); B65D 65/46 (2006.01); D21H 19/12 (2006.01); D21H 19/82 (2006.01); B05D 7/00 (2006.01)
CPC B65D 65/466 (2013.01) [B65D 65/42 (2013.01); D21H 19/12 (2013.01); D21H 19/82 (2013.01); B05D 7/584 (2013.01); B05D 2203/22 (2013.01); B05D 2401/20 (2013.01)] 45 Claims
OG exemplary drawing
 
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.