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:
Apr. 16, 2024
Filed:
Jun. 27, 2016
Applicant:
Pbi Performance Products, Inc., Charlotte, NC (US);
Inventors:
Brian P. Shiels, Charlotte, NC (US);
Gregory S. Copeland, Tega Cay, SC (US);
Feng Qin, Charlotte, NC (US);
Assignee:
PBI Performance Products, Inc., Charlotte, NC (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D01F 6/74 (2006.01); C08G 73/18 (2006.01); D03D 15/00 (2021.01); D06M 11/70 (2006.01); D01F 1/07 (2006.01); D06M 11/84 (2006.01);
U.S. Cl.
CPC ...
D01F 6/74 (2013.01); C08G 73/18 (2013.01); D06M 11/70 (2013.01); D01F 1/07 (2013.01); D06M 11/84 (2013.01); D06M 2200/30 (2013.01);
Abstract
A fiber is made with a polybenzimidazole (PBI) polymer with a phosphoric acid pick-up (APU) in the range of 1-25% (PBI-p fiber). The PBI-p fiber may have a LOI ≥50% and/or an initial thermal decomposition temperature in air of ≥555° C. A method of making a phosphonated polybenzimidazole fiber comprises the steps of: spinning an untreated PBI resin into a PBI fiber; treating the PBI fiber with phosphoric acid, and thereby obtaining a PBI fiber with 1-25 wt. % phosphoric acid APU.