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:
Jun. 06, 2017
Filed:
Aug. 14, 2013
Purac Biochem Bv, Gorinchem, NL;
Sulzer Chemtech Ag, Winterthur, CH;
Siebe Cornelis De Vos, Arnhem, NL;
Gerrit Gobius Du Sart, Herwijnen, NL;
Robert Edgar Haan, Gorinchem, NL;
Francois Loviat, Sennhof, CH;
PURAC BIOCHEM B.V., Gorinchem, NL;
SULZER CHEMTECH AG, Winterthur, CH;
Abstract
A method for manufacturing poly(2-hydroxyalkanoic acid) included the steps of a) mixing a cyclic diester of a 2-hydroxyalkanoic acid and a polymerization catalyst, b) polymerizing the cyclic diester to form poly(2-hydroxyalkanoic acid) in liquid phase, c) adding a phosphoric acid ester as a catalyst deactivating agent to the liquid phase, d) applying a devolatilization step to the liquid phase, and e) allowing the poly(2-hydroxyalkanoic acid) to solidify. The catalyst deactivating agent is added after the devolatilization step is applied. The method results in an improved melt stability of the manufactured polymer.