	US 11,807,725 B2
	Feedstock engineering of polyester waste for recycling processes
Gregory Breyta, San Jose, CA (US); Robert David Allen, Golden, CO (US); and Nitin Shashikant Parekh, Los Altos, CA (US)
Assigned to International Business Machines Corporation, Armonk, NY (US)
Filed by International Business Machines Corporation, Armonk, NY (US)
Filed on Dec. 1, 2021, as Appl. No. 17/540,184.
Claims priority of provisional application 63/120,364, filed on Dec. 2, 2020.
Prior Publication US 2022/0169823 A1, Jun. 2, 2022
Int. Cl. C08J 11/20 (2006.01)

CPC C08J 11/20 (2013.01) [C08J 2367/02 (2013.01)]

26 Claims

1. A method comprising:

treating a waste material comprising a polyester with a dissolution solution comprising hexafluoroisopropyl alcohol and a chlorinated hydrocarbon and/or an aromatic hydrocarbon to form dissolved polyester;

purifying the dissolved polyester; and

treating the purified and dissolved polyester with a technique to produce solid polyester, wherein the dissolution solution is separated from the solid polyester.