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. 07, 2003
Filed:
Mar. 12, 2001
Ken Homma, Kanagawa, JP;
Nobukatsu Wakabayashi, Kanagawa, JP;
Mitsubishi Engineering Plastics Corporation, Tokyo, JP;
Abstract
The object of the present invention is to provide a polyester resin composition which can provide a polyester film having a low minimum stretching temperature, and exhibiting excellent heat shrinkability at a lower temperature and flexibility. According to the present invention, there is provided a polyester resin composition comprising (a) an amorphous polyethylene terephthalate resin and (b) a polyester ether resin in admixture at a weight ratio of 97/3 to 50/50, wherein the polyester ether resin (b) is prepared by copolycondensation of (b1) dicarboxylic acid and/or ester derivative thereof consisting mainly of an aromatic dicarboxylic acid and/or ester derivative thereof, and (b2) diols consisting mainly of a C2-C6 alkylene glycol and a poly(C2-C4 alkylene oxide) glycol, and segments derived from the poly(C2-C4 alkylene oxide) glycol constitute 1 to 30% by weight of the polyester ether resin (b), and the polyester ether resin (b) has a peak temperature of tan &dgr; of 20 to 60° C.