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:
Jan. 01, 1985
Filed:
Mar. 03, 1982
Isoo Saito, Okazaki, JP;
Kotaro Fujioka, Nagoya, JP;
Hajime Arai, Okazaki, JP;
Hideo Saruyama, Okazaki, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
A polyester multifilament yarn which has the following properties: an initial modulus (Mi) of 90 to 130 grams per denier, a terminal modulus (Mt), a shrinkage index value (.DELTA.S/IV) of 2 to 8 percent, a birefringence (.DELTA.n) of 165.times.10.sup.-3 to 190.times.10.sup.3, a crystalline orientation function (fc) of 0.93 to 0.97, a crystal size (D) 47 to 55 angstroms, a long period (Lp) of 130 to 145 angstroms, a molecular orientation index in the amorphous region (F) of 0.80 to 0.92, and a concentration of carboxyl end groups (--COOH) of 0 to 25 equivalents per 10.sup.6 grams of the polymer is disclosed. The yarn is improved in modulus and shrinkage. A textile reinforcement for tire cord obtained from the multifilament yarn, exhibits exceedingly improved resistance to fatigue and durability to heating. The polyester multifilament yarn is obtained by (A) melt-spinning polymer at high speed (B) solidifying the spun yarn through a solidification zone comprising (a) a heating zone and (b) cooling zone adjacent to the lower part of the heating zone, and (C) withdrawing the solidified yarn, and (D) hot drawing the yarn.