The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2020
Filed:
Mar. 22, 2018
Applicant:
North Carolina State University, Raleigh, NC (US);
Inventors:
David Hinks, Apex, NC (US);
Guan Wang, Raleigh, NC (US);
Xiuzhu Fei, Raleigh, NC (US);
Harold Freeman, Raleigh, NC (US);
Assignee:
North Carolina State University, Raleigh, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D06L 4/30 (2017.01); D06P 5/13 (2006.01); D06P 1/651 (2006.01); D06P 1/62 (2006.01); D06L 4/70 (2017.01);
U.S. Cl.
CPC ...
D06L 4/30 (2017.01); D06L 4/70 (2017.01); D06P 1/621 (2013.01); D06P 1/65112 (2013.01); D06P 5/134 (2013.01);
Abstract
The disclosure relates to a method for decolorization of a dye-colored synthetic polymer, which includes the steps of treating a dye-colored synthetic polymer, such as polyester, with a treatment composition at pH 6 or less, the treatment composition comprising sodium formaldehyde sulfoxylate, water, and a ketone. The resulting decolorized synthetic polymer is then separated from the treatment composition.