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. 17, 2017
Filed:
Aug. 29, 2013
Hans Baer, Michelstadt, DE;
Felix Hofmann, Darmstadt, DE;
Silke Schminke, Zwingenberg, DE;
Julian Blaesy, Weiterstadt, DE;
Isabel Wahl, Kahl am Main, DE;
Hans Baer, Michelstadt, DE;
Felix Hofmann, Darmstadt, DE;
Silke Schminke, Zwingenberg, DE;
Julian Blaesy, Weiterstadt, DE;
Isabel Wahl, Kahl am Main, DE;
Evonik Roehm GmbH, Darmstadt, DE;
Abstract
The invention refers to a Process for preparing a bio-resorbable polyester the form of a powder with a bulk density of 0.3 g/ml or more, a tapped density of 0.4 g/ml or more and a specific surface area of 2.0 m/g or less comprising the steps a. dissolving a bio-resorbable polyester in a first solvent to form a polymer solution, b. contacting the polymer solution with a second solvent which is a non-solvent for the bioresorbable polyester and which is mainly water to result the precipitation of the bio-resorbable polyester in the form of a wet polymer mass, c. pre-drying the wet polymer mass at a temperature below the Tof the bio-resorbable polyester, d. comminuting the pre-dried polymer mass to polymer particles with a size below 10 mm, e. drying the comminuted polymer particles below the Tof the bio-resorbable polyester to a residual water content of 1% or less by weight/weight, f. post-treatment of the polymer particles from step e at a temperature in the range from the Tto the Tof the bio-resorbable polyester, g. comminuting the polymer particles from step f to a powder with a particle size of dof 1-300 μm and dof more than 30 and up to 3000 μm.