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, 2015
Filed:
Mar. 31, 2011
Joon Young Yoon, Gyeongsangbuk-do, KR;
Eun Jeong Cho, Gyeonggido, KR;
Joon Young Yoon, Gyeongsangbuk-do, KR;
Eun Jeong Cho, Gyeonggido, KR;
KOLON INDUSTRIES, INC., Gwacheon-si, KR;
Abstract
The method for preparing a carbon fiber of the present invention includes the steps of: preparing a polyacrylonitrile-based polymer solution; spinning the polyacrylonitrile-based polymer solution to prepare a precursor fiber for a carbon fiber, the precursor fiber having a water content of 20-50%; converting the precursor fiber for a carbon fiber into a preliminary flame-retarded fiber while stretching the precursor fiber for a carbon fiber at an elongation rate of −10˜−0.1% or 0.1˜5% at 180˜220° C. in air; converting the preliminary flame-retarded fiber into a flame-retardant fiber while stretching the preliminary flame-retarded fiber at an elongation rate of −5˜5% at 200˜300° C. in air; and heating the flame-retardant fiber under an inert atmosphere to carbonize the flame-retardant fiber.