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:
Feb. 28, 1978
Filed:
Dec. 13, 1974
Hiroshi Yasuda, Otsu, JA;
Susumu Omori, Otsu, JA;
Toyobo Co., Ltd., Osaka, JA;
Abstract
A method for producing polyester fibers having excellent dyeability with basic dyes or disperse dyes, which comprises melt-spinning a polyester comprising predominantly (at least 80% by mol) repeating units of ethylene terephthalate and containing 0.5% by mol or more, preferably 1.5 to 5% by mol of an ester unit derived from a dicarboxylic acid or diol containing at least one metal sulfonate group under the condition of being highly oriented so as to give filaments having a birefringence (.DELTA.n) of 0.015 to 0.100 and drawing the resulting filaments at a fixed temperature and in a fixed draw ratio, and the polyester fibers which can be dyed with basic dyes or disperse dyes at a temperature of less than 100.degree. C at a sufficiently high dye adsorption rate to give dyed fibers.