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. 29, 2014
Filed:
Dec. 16, 2010
Applicants:
Hideki Ozawa, Ichihara, JP;
Fumio Aoki, Ichihara, JP;
Inventors:
Hideki Ozawa, Ichihara, JP;
Fumio Aoki, Ichihara, JP;
Assignee:
UBE Industries, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 13/00 (2006.01); C08G 73/10 (2006.01); C08J 9/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Disclosed are polyimide short fibers having an extremely high heat resistance, suitable for non-woven fabrics and paper, and having many branches. Specifically, disclosed are polyimide short fibers having many branches, which are produced by beating and loosening a specific foamed polyimide material. The foamed material preferably comprises a polyimide produced using 2,3,3',4′-biphenyltetracarboxylic acid as an aromatic tetracarboxylic acid component, preferably has a glass transition temperature of 300° C. or higher, and preferably has an expansion ratio of 20 times or more.