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:
Oct. 31, 1995
Filed:
Mar. 08, 1994
Kazuomi Kubota, Chiba, JP;
Yoichi Murakami, Chiba, JP;
Dainippon Ink and Chemicals, Inc., Tokyo, JP;
Abstract
A process for producing a meso-compound-containing lactide, comprising thermally decomposing a hydroxycarboxylic acid oligomer in the presence of a salt of an alkali metal except sodium and in the presence or absence of a metal of the groups 4 to 15 of the periodic table and/or a salt thereof; and a process for purifying a crude lactide comprising recrystallizing a crude lactide using a poor solvent and a good solvent selected from aliphatic tertiary alcohols, ketones and esters are disclosed. The production ratio of a meso-lactide can be controlled by selection of the kind and the amount of a catalyst so as to obtain a lactide having an appropriate optical purity suitable for production of biodegradable polymers. The purification process achieves a high recovery.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile