Patent · US Active

High molecular weight poly(methacrylic acid)

US11001652B2 · kind B2 · utility

0Cited by

14References

18Claims

0Family size

Assignee

ALCON INC. · CH

Inventors

Stephan Wittmar · Unterentersbach, DE
Thomas Schmidt · Neustadt, DE
Justyna Justynska-Reimann · Oppenheim, DE
Claudio Hofmann · Seligenstadt, DE

Key dates

Filing date	Jan 27, 2020
Grant date	May 11, 2021
Priority date	—
Expiry date	Jan 27, 2040

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K5/3725
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.