US 12,320,067 B2
Polymer coated paper recycling process and composition
Meysam Araghi, Ottawa (CA); Alireza Naeimi Panjaki, Ottawa (CA); Behnam Rahmanloo, Ottawa (CA); Abdolkarim Sharifi, Ottawa (CA); Alireza Ghasemi, Ottawa (CA); Ghazal Asemian, Ottawa (CA); and Ghazaleh Asemian, Ottawa (CA)
Assigned to NANOCYCLE TECH INC., Ottawa (CA)
Filed by NANOCYCLE TECH INC., Ottawa (CA)
Filed on Jun. 23, 2022, as Appl. No. 17/848,317.
Claims priority of provisional application 63/213,888, filed on Jun. 23, 2021.
Prior Publication US 2022/0412003 A1, Dec. 29, 2022
Int. Cl. D21C 5/02 (2006.01); D21B 1/32 (2006.01); D21C 3/20 (2006.01); D21C 9/06 (2006.01)
CPC D21C 5/022 (2013.01) [D21C 3/20 (2013.01); D21C 5/02 (2013.01); D21C 9/06 (2013.01); D21B 1/32 (2013.01); Y02W 30/64 (2015.05)] 13 Claims
OG exemplary drawing
 
1. A process for removing a polymer coating from polymer-coated paper waste to provide a depolymered paper product, comprising the steps of:
providing shredded polymer-coated paper waste;
combining the shredded polymer-coated paper waste with a polymer removing composition in a mixing tank to provide a mixture of the polymer-coated paper waste and the polymer removing composition, wherein the polymer removing composition comprises:
from about 70 wt % to about 98 wt % of a solvent component comprising one or more solvents selected from acetone, hexane, mineral spirits, water, cyclohexane, naphtha, benzyl alcohol, isoparaffin, ethanol, isopropanol, toluene, xylene, pyridine, kerosene, and gasoline,
from about 0.5 wt % to about 15 wt % of a surfactant component comprising one or more surfactants selected from sulfonic acid surfactants, sulfonate surfactants and sulfate surfactant, and
from about 0.5 wt % to about 20 wt % of an acidic component comprising one or more acids selected from sulfuric acid, acetic acid, hydrochloric acid, formic acid, citric acid, and nitric acid;
reacting the mixture for a time sufficient to remove the polymer from the paper to provide a first depolymered paper product;
removing excess polymer removing composition from the first depolymered paper product to provide a wet depolymered paper product;
washing the wet depolymered paper product with a washing solution comprising water and detergent and/or a low boiling solvent to provide a washed depolymered paper product; and
drying the washed depolymered paper product to provide the final paper product.