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:
Mar. 01, 2022
Filed:
Aug. 31, 2018
Applicant:
Evonik Corporation, Parsippany, NJ (US);
Inventors:
Jie Lu, Norwalk, CT (US);
Boris Obermeier, Hattersheim, DE;
Regina Arnold-Stanton, Vestavia Hills, AL (US);
Adolphus G. Jones, Hoover, AL (US);
Assignee:
Evonik Corporation, Parsippany, NJ (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08G 63/08 (2006.01); C08G 63/90 (2006.01); C08G 63/85 (2006.01); C08K 3/04 (2006.01); C08K 5/09 (2006.01);
U.S. Cl.
CPC ...
C08G 63/90 (2013.01); C08G 63/08 (2013.01); C08G 63/85 (2013.01); C08K 3/04 (2013.01); C08K 5/09 (2013.01);
Abstract
The present invention is directed to an improved purification process using additive and activated carbon for purifying resorbable polymers suitable for industrial manufacturing. The metal catalyst concentration in the purified resorbable polymers of this invention is preferably less than 1 ppm. The method can be used to obtain high molecular weight polymers that are substantially metal free.