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. 08, 1995
Filed:
May. 19, 1994
Fumiaki Ichikawa, Fukuoka, JP;
Mineo Kobayashi, Fukuoka, JP;
Masahiro Ohta, Fukuoka, JP;
Yasunori Yoshida, Fukuoka, JP;
Shoji Obuchi, Fukuoka, JP;
Hiroyuki Itoh, Fukuoka, JP;
Mitsui Toatsu Chemicals, Inc., Tokyo, JP;
Abstract
A process for preparing polyhydroxycarboxylic acid by conducting dehydration polycondensation of hydroxycarboxylic acids in the presence or absence of a catalyst and in the presence or absence of an organic solvent, comprising using a vertical high viscosity reactor during all or a portion of the dehydration polycondensation steps and conducting hot polycondensation while separating and removing low boiling components. The process can provide high molecular weight polyhydroxycarboxylic acid with ease and cheaply in industry.