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:
Oct. 29, 2013
Filed:
May. 12, 2009
Norifumi Hirota, Otake, JP;
Yusuke Shinmen, Otake, JP;
Naomasa Matsuyama, Otake, JP;
Takeshi Nii, Otake, JP;
Harumi Shibatani, Otake, JP;
Norifumi Hirota, Otake, JP;
Yusuke Shinmen, Otake, JP;
Naomasa Matsuyama, Otake, JP;
Takeshi Nii, Otake, JP;
Harumi Shibatani, Otake, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
Disclosed are an acrylonitrile copolymer excellent in thermal stability as a solution (spinning dope) when dissolved in an amide solvent and capable of forming dense polyacrylonitrile fiber suitable for production of carbon fiber, an acrylonitrile copolymer solution in which the acrylonitrile copolymer is dissolved in an amide solvent, and a method for producing polyacrylonitrile precursor fiber for carbon fiber by use of the acrylonitrile copolymer solution. Specifically, an acrylonitrile copolymer contains a sulfonate group derived from a polymerization initiator in an amount of 1.0×10equivalent/g or more, and the value (equivalent ratio) of (the content of a sulfate group derived from the polymerization initiator/the total content of the sulfonate group and the sulfate group) is 0.4 or less; an acrylonitrile copolymer solution contains the aforementioned acrylonitrile copolymer and an amide solvent.