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:
Sep. 27, 2016
Filed:
Sep. 02, 2009
Yun JO Kim, Gumi-si, KR;
Gi Sang Song, Gumi-si, KR;
SI Min Kim, Daegu, KR;
KOLON INDUSTRIES, INC., Gwacheon-si, KR;
Abstract
Provided is a polyester film having excellent high-temperature dimensional stability. More particularly, provided is a method for producing a polyester film, including: a) extruding and cooling a polyester resin to provide a non-oriented sheet; b) orienting the sheet in the machine direction (MD); c) orienting the MD oriented sheet in the transverse direction (TD); d) heat treating the sheet; and e) carrying out simultaneous relaxation by subjecting the heat treated sheet to MD relaxation at a ratio of 1% or higher, while subjecting it to TD relaxation in a tenter. Provided also is a polyester film obtained by the method.