公开(公告)号：US11447583B2

公开(公告)日：2022-09-20

申请号：US17229513

申请日：2021-04-13

Applicant: Alcon Inc.

Inventor： Stephan Wittmar ,  Thomas Schmidt ,  Justyna Justynska-Reimann ,  Claudio Hofmann

IPC: C08F120/06 ,  C08F20/18 ,  C08F2/10 ,  C08K5/23 ,  C08K5/372

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.

公开(公告)号：US11001652B2

公开(公告)日：2021-05-11

申请号：US16752998

申请日：2020-01-27

Applicant: Alcon Inc.

Inventor： Stephan Wittmar ,  Thomas Schmidt ,  Justyna Justynska-Reimann ,  Claudio Hofmann

IPC: C08F20/18 ,  C08F2/10 ,  C08K5/23 ,  C08K5/372

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.

公开(公告)号：US20210230321A1

公开(公告)日：2021-07-29

申请号：US17229513

申请日：2021-04-13

Applicant: Alcon Inc.

Inventor： Stephan Wittmar ,  Thomas Schmidt ,  Justyna Justynska-Reimann ,  Claudio Hofmann

IPC: C08F20/18 ,  C08F2/10

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.

公开(公告)号：US10782450B2

公开(公告)日：2020-09-22

申请号：US15792806

申请日：2017-10-25

Applicant: Alcon Inc.

Inventor： Harald Bothe ,  Bernhard Seiferling ,  Heike Arndt ,  Thomas Wasse ,  Stephan Wittmar

IPC: G02B1/04 ,  G02C7/04 ,  C08L29/04 ,  C07H3/02 ,  C07H3/04 ,  C08L39/04 ,  C08L71/08 ,  C09D129/14 ,  C08F216/38 ,  C08F222/38 ,  C08F226/06 ,  C08K5/15

Abstract: 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.

公开(公告)号：US20200239606A1

公开(公告)日：2020-07-30

申请号：US16752998

申请日：2020-01-27

Applicant: Alcon Inc.

Inventor： Stephan Wittmar ,  Thomas Schmidt ,  Justyna Justynska-Reimann ,  Claudio Hofmann

IPC: C08F20/18 ,  C08F2/10

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.