Alcon, Inc.

Stephan Wittmar

Justyna Justynska-Reimann

Thomas Schmidt

Claudio Hofmann

Bernhard Seiferling

Harald Bothe

Heike Arndt

Thomas Wasse

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.

High molecular weight poly(methacrylic acid)

The invention is generally related to soft contact lenses which comprise a polyvinylalcohol-based hydrogel lens body and a durable lubricious coating thereon which are covalently attached to the polyvinylalcohol-based hydrogel lens body through 6-membered acetal rings and to a method for producing the same.

Soft contact lenses with a lubricious coating covalently-attached thereon

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Erlenbach, Germany

Stephan Wittmar