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:
Aug. 09, 2005
Filed:
Sep. 11, 2003
Takeshi Hirokane, Kanagawa, JP;
Tsuyoshi Ikeda, Kanagawa, JP;
Shojiro Kuwahara, Kanagawa, JP;
Takamasa Kawashima, Kanagawa, JP;
Tomohito Oyama, Kanagawa, JP;
Takeshi Hirokane, Kanagawa, JP;
Tsuyoshi Ikeda, Kanagawa, JP;
Shojiro Kuwahara, Kanagawa, JP;
Takamasa Kawashima, Kanagawa, JP;
Tomohito Oyama, Kanagawa, JP;
Mitsubishi Gas Chemical Co., Inc., Tokyo, JP;
Abstract
The process of the present invention for producing a polyester resin comprising a dicarboxylic acid constitutional unit and a diol constitutional unit having a cyclic acetal skeleton comprises a step (1) of subjecting a diol (A) having a cyclic acetal skeleton and an ester (D) to transesterification reaction and a step (2) of mainly converting the resultant oligomer into a high polymer. The step (1) simultaneously satisfies the requirements (i) to (iv) as described in the specification. In the process of the present invention, the polyester resins having excellent moldability and mechanical properties are stably produced by a transesterification method which is less detrimental to environments.