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:
Apr. 30, 2013
Filed:
Nov. 14, 2008
Gerald Rafler, Potsdam, DE;
Jutta Rafler, Potsdam, DE;
Andreas Windsperger, Maria Anzbach, AT;
Robert Edlauer, Laa a.d. Thaya, AT;
Josef Gass, Drösing, AT;
Gerald Rafler, Potsdam, DE;
Jutta Rafler, Potsdam, DE;
Andreas Windsperger, Maria Anzbach, AT;
Robert Edlauer, Laa a.d. Thaya, AT;
Josef Gass, Drösing, AT;
Jungbunzlauer Austria AG, Vienna, AT;
Abstract
Method for the production of L,L-, D,D-, D,L- and meso-dilactides, comprising the polycondensation and/or polytransesterification of an L-, D- or D,L-lactic acid or of esters thereof to polyesters of higher molecular weights of the L-, D- and D,L-lactic acid (polylactic acids) and cyclizing depolymerization of the polylactic acids to dilactides, wherein the polyesters of higher molecular weights of the L-, D- and D,L-lactic acids are produced in the presence of hydrolysis-stable metal compounds as catalyst.