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:
Nov. 11, 2014
Filed:
Jun. 14, 2010
Kenichiro Matsuba, Narashino, JP;
Tsuyoshi Aoki, Suginami-ku, JP;
Kenichiro Matsuba, Narashino, JP;
Tsuyoshi Aoki, Suginami-ku, JP;
Toyo Engineering Corporation, Tokyo, JP;
Masashino Chemical Laboratory, Ltd, Tokyo, JP;
Abstract
PROBLEM There is provided a method for producing polylactic acid, which is capable of obtaining polylactic acid at low cost, and having high molecular weight. SOLUTION A method for producing polylactic acid by polymerizing molten lactide using at least one reactor having plug flow characteristics with ξ(τ), calculated from the following FORMULA (1), of 0.3 or smaller:ξ(τ)=∫((τ)×(1−τ))  (1)in the Formula (1), E(τ) is a residence time distribution function determined by impulse response by starch syrup having a viscosity of 3 Pa·s, and τ is ratio of elapsed time θ and mean residence time θ.