	US 12,187,856 B2
	Depolymerization of polymers
Dimitris Ioannis Collias, Cincinnati, OH (US); Paul Zimmerman, Ann Arbor, MI (US); Paul Takunda Chazovachii, Ann Arbor, MI (US); Michael Robo, Ann Arbor, MI (US); Anne McNeil, Ann Arbor, MI (US); and John McDaniel, Cincinnati, OH (US)
Assigned to The Procter & Gamble Company, Cincinnati, OH (US)
Filed by The Regents of the University of Michigan, Ann Arbor, MI (US); and The Procter & Gamble Company, Cincinnati, OH (US)
Filed on Aug. 24, 2020, as Appl. No. 17/001,338.
Claims priority of provisional application 62/890,880, filed on Aug. 23, 2019.
Prior Publication US 2021/0054161 A1, Feb. 25, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C08J 11/06 (2006.01); C09J 133/02 (2006.01)

CPC C08J 11/06 (2013.01) [C09J 133/02 (2013.01); C08J 2333/02 (2013.01)]

11 Claims

1. A method for producing polyacrylic acid (PAA) from a superabsorbent polymer (SAP); wherein said SAP is further surface-crosslinked; said method comprising adding a base and NaCl to an aqueous SAP hydrogel, and sonicating said aqueous SAP hydrogel to produce said PAA;

wherein said aqueous SAP hydrogel comprises at least 2.5% weight per volume SAP.