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:
Sep. 20, 2022
Filed:
Apr. 13, 2021
Alcon Inc., Fribourg, CH;
Stephan Wittmar, Erlenbach, DE;
Thomas Schmidt, Bautzen, DE;
Justyna Justynska-Reimann, Oppenheim, DE;
Claudio Hofmann, Karlstein am Main, DE;
Alcon Inc., Fribourg, CH;
Abstract
The invention is generally related to a process for producing a relatively high molecular weight poly(methacrylic acid) ('PMAA') in a water-based system. The process of the invention comprises polymerization of from about 1% to about 20% by weight of methacrylic acid in water or a water-based system in the presence of thiol compound and an azo radical initiator under controlled reaction and process conditions. A process of the invention can be easily scaled up into the pilot scale for producing large quantities of high molecular weight PMAAs. The invention is also related to high molecular weight poly(methacrylic acid)s obtained according to a process of the invention.