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:
Nov. 17, 2020
Filed:
Apr. 18, 2013
Applicant:
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
Mitsubishi Chemical Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D01F 9/22 (2006.01); D01F 6/38 (2006.01); D01F 6/18 (2006.01); C08K 7/06 (2006.01);
U.S. Cl.
CPC ...
D01F 9/22 (2013.01); C08K 7/06 (2013.01); D01F 6/18 (2013.01); D01F 6/38 (2013.01); D01F 9/225 (2013.01); D10B 2101/12 (2013.01); Y10T 428/2918 (2015.01);
Abstract
Provided are carbon fiber bundles which have high knot strength even if the single fiber fineness is large, and which have excellent handling properties and processability. The carbon fiber bundles have a single fiber fineness of 0.8-2.5 dtex, knot strength of 298 N/mmor greater. This method of producing carbon fibers having knot strength of 298 N/mmor greater involves a heat treatment step for heat treating, for 50-150 minutes, specific polyacrylonitrile-based precursor fiber bundles described in the description in an oxidizing atmosphere rising in temperature in the temperature range of 220-300° C.