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. 18, 2005
Filed:
Jan. 23, 2004
Ik-hyeon Kwon, Seoul, KR;
Woo-sung Kim, Ulsan Kwangyeok-si, KR;
Yun-hyuk Bang, Kyonggi-do, KR;
Young-jo Kim, Kyonggi-do, KR;
Chan-min Park, Ulsan Kwangyeok-si, KR;
Ik-Hyeon Kwon, Seoul, KR;
Woo-Sung Kim, Ulsan Kwangyeok-si, KR;
Yun-Hyuk Bang, Kyonggi-do, KR;
Young-Jo Kim, Kyonggi-do, KR;
Chan-Min Park, Ulsan Kwangyeok-si, KR;
Hyosung Corporation, , KR;
Abstract
The present invention relates to a high tenacity polyethylene naphthalate fiber containing a silica compound. This fiber is produced by a method comprising the steps of: (A) melt-spinning a solid phase-polymerized polyethylene-2,6-naphthalate chip containing ethylene-2,6-naphthalate units at more than 85 mole % and a silica compound and having an intrinsic viscosity of 0.70-1.20, to produce a melt-spun yarn; (B) passing the melt-spun yarn through a retarded cooling zone and a cooling zone to solidify the yarn; (C) withdrawing the yarn at such a speed that the undrawn yarn has a birefringence of 0.001-0.1; and (D) subjecting the undrawn yarn to multi-stage drawing at a total draw ratio of at least 1.5 and a drawing temperature of 50-250° C. The polyethylene naphthalate fiber has improved physical properties, such as high tenacity, and a dipped cord produced from this fiber has excellent dimensional stability and tenacity such that it can be advantageously employed as a reinforcement material of rubber products.