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:
Dec. 17, 1996
Filed:
Dec. 28, 1994
Applicant:
Inventors:
Chieh-Chun Chau, Midland, MI (US);
Ritchie A Wessling, Midland, MI (US);
Katsuya Tani, Shiga-gun, JP;
Masaru Nakagawa, Tsuruga, JP;
Takaharu Ichiryu, Ohtsu, JP;
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D01D / ; D01D / ; D01F / ;
U.S. Cl.
CPC ...
264 28 ; 264143 ; 26421115 ; 26421116 ; 264233 ;
Abstract
The invention is a process for the preparation of polybenzazole staple fibers which includes extruding a solution of polybenzazole polymer to form a dope filament, cutting the dope filament to a desired length, and washing and drying the cut filament. It has been discovered that the process of the invention provides a suitable means to prepare staple fibers which does not require the cutting of washed, rigid polybenzazole filaments.