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:
Jul. 04, 1989
Filed:
Dec. 09, 1988
Applicant:
Inventors:
Noboru Chujo, Kyoto, JP;
Shigeo Mori, Kyoto, JP;
Assignee:
Dai-Ichi Kogyo Seiyaku Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528272 ; 528274 ; 528277 ; 528300 ; 528308 ; 5283082 ; 528489 ;
Abstract
This invention relates to a method of producing a modified polyester having high fiber whiteness and satisfactory dyeability. In producing a polyester at least 80% of whose repeating structural units are ethylene terephthalate units, at least one specified polyalkylene glycol having a potassium and sodium content not more than 3 ppm and an average molecular weight not less than 400 is added for copolymerization. The method enables production of a polyester with a high degree of whiteness and, moreover, a polyester with excellent static-proofness and dyeability.