	US 11,739,240 B2
	Super absorbent polymer recycling to pressure sensitive adhesives
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); Neil Marsh, Ann Arbor, MI (US); and Martin Ian James, 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. 17/1,345.
Claims priority of provisional application 62/947,363, filed on Dec. 12, 2019.
Claims priority of provisional application 62/890,943, filed on Aug. 23, 2019.
Prior Publication US 2021/0054248 A1, Feb. 25, 2021
Int. Cl. C08J 11/16 (2006.01); C09J 133/08 (2006.01); C08F 20/12 (2006.01); C08F 8/14 (2006.01); C08F 8/18 (2006.01)

CPC C09J 133/08 (2013.01) [C08F 8/14 (2013.01); C08F 8/18 (2013.01); C08F 20/12 (2013.01); C08J 11/16 (2013.01); C08J 2333/08 (2013.01)]

19 Claims

1. A method for preparing a pressure sensitive adhesive from one or more sodium polyacrylate-based superabsorbent polymers, the method comprising:

(a) providing a solution comprising one or more sodium polyacrylate-based superabsorbent polymers;

(b) decrosslinking the one or more sodium polyacrylate-based superabsorbent polymers to provide one or more decrosslinked sodium poly acrylate-based superabsorbent polymers;

(c) optionally sonicating the one or more decrosslinked sodium polyacrylate-based superabsorbent polymers to provide one or more chain-shortened sodium polyacrylate-based superabsorbent polymers;

(d) protonating the one or more decrosslinked and/or chain-shortened sodium polyacrylate-based superabsorbent polymers to provide one or more protonated decrosslinked and/or chain-shortened polyacrylic acid-based superabsorbent polymers; and

(e) esterifying the one or more protonated decrosslinked and/or chain-shortened polyacrylic acid-based superabsorbent polymers to provide a pressure sensitive adhesive.