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    PHOTOCHROMIC POLYDIORGANOSILOXANE VINYLIC CROSSLINKERS
    11.
    发明申请
    PHOTOCHROMIC POLYDIORGANOSILOXANE VINYLIC CROSSLINKERS 有权

    公开(公告)号：US20210284806A1

    公开(公告)日：2021-09-16

    申请号：US17199158

    申请日：2021-03-11

    Applicant: Alcon Inc.

    Inventor： Yuan Chang ,  Junhao Ge ,  Steve Yun Zhang ,  Weihong Lang

    IPC: C08G77/388 ,  C08L83/08

    Abstract: The invention provides a class of photochromic polydiorganosiloxane vinylic crosslinkers. Each of the photochromic polydiorganosiloxane vinylic crosslinkers of the invention comprise (1) a polydiorganosiloxane polymer chain comprising dimethylsiloxane units and photochromic siloxane unit having one methyl substituent and one organic substituent having a photochromic moiety that capable of undergoing a reversible color change upon exposure to UV-irradiation or high-energy-violet light; (2) two terminal ethylenically-unsaturated groups. The invention also provides a soft photochromic contact lens, especially a photochromic silicone hydrogel contact lens, which comprises a crosslinked polymeric material comprising repeating units of at least one of such a class of photochromic polydiorganosiloxane vinylic crosslinkers. The invention further provides a method of producing a photochromic contact lens from a polymerizable composition comprising at least one of such a class of photochromic polydiorganosiloxane vinylic crosslinkers.

    Method for producing photochromic contact lenses
    15.
    发明授权
    Method for producing photochromic contact lenses 有权

    公开(公告)号：US11542353B2

    公开(公告)日：2023-01-03

    申请号：US16872628

    申请日：2020-05-12

    Applicant: Alcon Inc.

    Inventor： Weihong Lang ,  Junhao Ge ,  Steve Yun Zhang ,  Daqing Wu

    IPC: C08F271/02 ,  B29D11/00 ,  C08K5/1545 ,  C08K5/17 ,  B29K83/00 ,  B29K105/00 ,  G02B1/04

    Abstract: The invention provides a method for producing photochromic silicone hydrogel (SiHy) contact lenses based on thermal cast-molding technology in a relatively efficient and consistent manner. The method is characterized by selecting a high radical-reactive hydrophilic acrylic monomer while eliminating any low radical-reactive hydrophilic N-vinyl amide monomer in a lens formulation (polymerizable composition), by selecting a weight ratio of low-radical-reactive hydrophilic N-vinyl amide monomer to a high radical-reactive hydrophilic acrylic monomer in a lens formulation if the low radical-reactive hydrophilic N-vinyl amide monomer is needed, and/or by using a relatively high temperature thermal initiator in a lens formulation, to control the lens properties (e.g., water content, elastic modulus, etc.) and lens processability (capability of dry-delensing from molds) of thermally cast-molded SiHy contact lenses while minimizing loss in photochromic ability of resultant SiHy contact lenses.

    Method for preparing silicone hydrogels
    16.
    发明授权
    Method for preparing silicone hydrogels 有权

    公开(公告)号：US11433629B2

    公开(公告)日：2022-09-06

    申请号：US16429776

    申请日：2019-06-03

    Applicant: Alcon Inc.

    Inventor： Weihong Lang ,  Wei Liang ,  Ying Zheng ,  Karen Belinda Sentell ,  Richard Charles Breitkopf ,  Daqing Wu ,  Steve Yun Zhang

    IPC: B29D11/00 ,  G02B1/04 ,  B29K83/00 ,  B29K105/00

    Abstract: The invention provides a contact lens manufacturing method for cast-molding of silicone hydrogel contact lenses having enhanced oxygen permeability without adversely affecting desirable lens mechanical properties (e.g., modulus). A method of the invention comprises adding a small amount of a radical scavenger (e.g., H-TEMPO) in a polymerizable composition for cast-molding of SiHy contact lenses) to provide the resultant polymerizable composition with a bi-phase curing profile at a curing temperature of from about 45° C. to about 100° C. With such a bi-phase curing profile, the resultant polymerizable composition can be thermally cured at the curing temperature to form a SiHy contact lens having an oxygen permeability higher than that for a polymerizable composition having the substantially identical composition excepting being free of any radical scavenger.

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