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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.:

US 8911649 B1

PDFFull Text
Date of Patent:
Dec. 16, 2014

Filed:

Mar. 23, 2012

Methods of preparing polyimide fibers with kidney-shaped cross-sections

Applicants:

Dezhen Wu, Beijing, CN;

Enlin Han, Beijing, CN;

Lun LI, Beijing, CN;

Hongqing Niu, Beijing, CN;

Gongping Shang, Beijing, CN;

Shengli Qi, Beijing, CN;

Xiaodong Wang, Beijing, CN;

Inventors:

Dezhen Wu, Beijing, CN;

Enlin Han, Beijing, CN;

Lun Li, Beijing, CN;

Hongqing Niu, Beijing, CN;

Gongping Shang, Beijing, CN;

Shengli Qi, Beijing, CN;

Xiaodong Wang, Beijing, CN;

Assignee:

Beijing University of Technology, Beijing, CN;

Attorney:

Han IP Corporation

Primary Examiner:

Leo B Tentoni

Int. Cl.
CPC ...
D01D 5/06 (2006.01); D01D 5/12 (2006.01); D01D 5/253 (2006.01); D01D 10/02 (2006.01); D01D 10/06 (2006.01); D02J 1/22 (2006.01); D02J 13/00 (2006.01); D01D 1/10 (2006.01);
U.S. Cl.
CPC ...
D01D 1/103 (2013.01); D01D 1/106 (2013.01);
Abstract

The present disclosure provides polyimide fibers with kidney-shaped cross-section and their preparation methods thereof, falling within the technical field of polyimide fiber. Polyimide fibers with kidney-shaped cross-sections are prepared by a continuous, integrated approach, starting from a polyamic acid solution prepared by reacting an aromatic dianhydride with an aromatic diamine. PAA nascent fibers with kidney-shaped cross-sections are obtained by adopting a spinneret having circular orifices under wet spinning process. The kidney-shaped cross-sections are obtained by varying the processing condition, including spinning speed, coagulation bath composition, coagulation temperature, and depth of coagulation bath. After washing and drying, polyamic acid nascent fibers are converted to polyimide fibers with kidney-shaped cross-sections under thermal curing. The integrated preparation methods are suitable for mass industrial production.

Find Patent Forward Citations

Wu, Dezhen. (2014). Methods of preparing polyimide fibers with kidney-shaped cross-sections (U.S. Patent No. 8911649). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/8911649

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