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:
May. 01, 2012
Filed:
Jan. 15, 2009
Eiji Kinoshita, Gifu, JP;
Mitsuo Tojo, Gifu, JP;
Eiji Kinoshita, Gifu, JP;
Mitsuo Tojo, Gifu, JP;
Teijin Limited, Osaka-shi, JP;
Abstract
A polyester resin having excellent dimensional stability against environmental changes and excellent dimensional stability in the processing step while having excellent moldability and a biaxially oriented polyester film comprising the same. The polyester resin comprises a recurring unit represented by the following formula (A) and a recurring unit represented by the following formula (B) as the main constituents:—O—C(O)—R—C(O)—O—R—O—  (A)—O—C(O)—R—C(O)—O—R—O—  (B)(R' is a phenylene group or naphthalenediyl group, Ris an alkylene group having 2 to 4 carbon atoms or cyclohexylene group, and Ris 6,6′-(alkylenedioxy)di-2-naphthoic acid), wherein the content of the recurring unit (B) is not less than 5 mol % and less than 50 mol %, and the ratio of adjacent recurring units (A) and (B) is less than 0.9 based on a value obtained by doubling the product of the content of the recurring unit (A) and the content of the recurring unit (B).