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:
Dec. 10, 2013
Filed:
Oct. 21, 2010
Masayuki Kamikawa, Hitachinaka, JP;
Toshiaki Matsuo, Mito, JP;
Kenichiro Oka, Mito, JP;
Takeyuki Kondo, Hitachi, JP;
Yasunari Sase, Tokyo, JP;
Masashi Tanto, Tokyo, JP;
Masayuki Kamikawa, Hitachinaka, JP;
Toshiaki Matsuo, Mito, JP;
Kenichiro Oka, Mito, JP;
Takeyuki Kondo, Hitachi, JP;
Yasunari Sase, Tokyo, JP;
Masashi Tanto, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A device and a method for producing high-quality polybutylene succinate are provided. The method for producing polybutylene succinate comprises the steps of: preparing a raw-material slurry by mixing succinic acid or a derivative thereof with 1,4-butanediol in a raw-material slurry preparation tank; storing the raw-material slurry in a raw-material slurry storage tank while maintaining flowability; carrying out an esterification reaction of the raw-material slurry in an esterification reactor; and synthesizing polybutylene succinate with a polycondensation reaction of the ester in a polycondensation reactor, in which the polycondensation reactor is divided, from the upstream side, into at least an initial polycondensation reactor, an intermediate polycondensation reactor, and a final polycondensation reactor, a catalyst is added in an amount from 1000 ppm to 3000 ppm in relation to succinic acid or a derivative thereof, the reaction time in the intermediate polycondensation reactor ranges from 0.25 hours to 0.75 hours, and the reaction temperature in the final polycondensation reactor ranges from 245° C. to 255° C.