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    Pad transfer printing method for making colored contact lenses
    23.
    发明授权
    Pad transfer printing method for making colored contact lenses 有权

    公开(公告)号：US11602910B2

    公开(公告)日：2023-03-14

    申请号：US16884536

    申请日：2020-05-27

    Applicant: Alcon Inc.

    Inventor： Richard Charles Breitkopf ,  Changhong Yin ,  Steve Yun Zhang

    IPC: B29D11/00 ,  C08L83/04 ,  G02B1/04

    Abstract: The invention relates to a pad printing instrument comprising an ink supply system capable of control the temperature, viscosity and colorant concentration of an ink in an ink cup. Such controls are achieved by continuously adding and mixing a cold ink having a composition identical to the ink in the ink cup but having a lower temperature. The continuous addition of a small amount of a cold ink into the ink cup could compensate heat generated by the friction between the ink cup and a cliché and could minimize the evaporation of a diluent in the ink and change in the concentration of colorants in the ink and ink viscosity. The invention also relates to use of a pad printing instrument comprising an ink supply system of the invention for producing colored hydrogel or silicone hydrogel contact lenses.

    METHOD FOR MAKING PHOTOCHROMIC CONTACT LENSES
    24.
    发明申请
    METHOD FOR MAKING PHOTOCHROMIC CONTACT LENSES 有权

    公开(公告)号：US20220283338A1

    公开(公告)日：2022-09-08

    申请号：US17688041

    申请日：2022-03-07

    Applicant: Alcon Inc.

    Inventor： Michelle Plavnik ,  Richard Charles Breitkopf ,  Steve Yun Zhang ,  Zahra Bassampour ,  Chandana Kolluru

    IPC: G02B1/04 ,  B29D11/00 ,  C08G77/20

    Abstract: Described herein is a method for producing a contact lens comprising a central photochromic zone that has a diameter of about 13 mm or less and is concentric with the central axis of the contact lens. The method comprises: applying a first polymerizable fluid composition containing at least one photochromic compound on a central portion of the molding surface of a female mold half to form a circular layer; partially photocuring, in situ, the circular layer in the female mold half by using a visible light; dispensing a second polymerizable fluid composition over the partially-cured circular layer on the molding surface of the female mold half; and a step of thermally curing the second polymerizable fluid composition and the partially-cured circular layer immersed therein in the mold cavity formed between the the molding surfaces of the female mold half and a male mold half.

    Method for producing silicone hydrogel contact lenses
    25.
    发明授权
    Method for producing silicone hydrogel contact lenses 有权

    公开(公告)号：US11254076B2

    公开(公告)日：2022-02-22

    申请号：US16429811

    申请日：2019-06-03

    Applicant: Alcon Inc.

    Inventor： Junhao Ge ,  Daqing Wu ,  Richard Charles Breitkopf ,  Steve Yun Zhang ,  Augustine Twum Kumi

    IPC: B29D11/00 ,  C08F226/10 ,  G02B1/04 ,  B29K83/00 ,  B29K105/00

    Abstract: The invention provides a contact lens manufacturing method comprising a process for removing unprocessed molded silicone hydrogel contact lenses from mold halves in a relatively efficient and consistent manner. A method of the invention comprising the steps of formulating a lens formulation by dissolving/blending all polymerizable components in a mixture a hydrophobic acrylic monomer as a reactive diluent and an organic solvent as a non-reactive diluent at a weight ratio of least 0.24 (reactive diluent over the sum of reactive and non-reactive solvents) per gram of the polymerizable composition and using a relatively low ultrasonic vibration energy for delensing. This method of the invention can be easily implemented in a production environment for enhancing the production yield.

    METHOD FOR MAKING EMBEDDED HYDROGEL CONTACT LENSES
    28.
    发明公开
    METHOD FOR MAKING EMBEDDED HYDROGEL CONTACT LENSES 审中-公开

    公开(公告)号：US20230357478A1

    公开(公告)日：2023-11-09

    申请号：US18313489

    申请日：2023-05-08

    Applicant: Alcon Inc.

    Inventor： Newton T. Samuel ,  Cornelius Daniel Niculas ,  Richard Charles Breitkopf ,  Nicholas Gober ,  Chandana Kolluru ,  Zahra Bassampour ,  Steve Yun Zhang

    IPC: C08F283/12

    CPC classification number: C08F283/124

    Abstract: A method for producing embedded hydrogel contact lenses comprises at least the following steps: depositing a small drop of a viscous lens-forming composition in the center of a female lens mold half; placing a preformed insert on top of the small drop precisely in the center of the female lens mold half so that the insert is held by capillary forces due to the presence of a thin layer of the viscous lens-forming composition between the insert and the molding surface of the female lens mold half; dosing an amount of another less viscous lens-forming composition on top of the insert to immerse the insert in the female lens mold half; closing tightly a male lens mold half onto the top of the female lens mold half halves to form a molding assembly; curing both the lens-forming compositions in the molding assembly to form an embedded hydrogel lens precursor.

    Method for making opaque colored silicone hydrogel contact lenses
    30.
    发明授权
    Method for making opaque colored silicone hydrogel contact lenses 有权

    公开(公告)号：US11584097B2

    公开(公告)日：2023-02-21

    申请号：US16884512

    申请日：2020-05-27

    Applicant: Alcon Inc.

    Inventor： Steve Yun Zhang ,  Changhong Yin ,  Richard Charles Breitkopf

    IPC: B29D11/00 ,  C07F7/08 ,  C08L83/04 ,  G02B1/04

    Abstract: The invention provides a thermal cast-molding method for producing colored silicone hydrogel contact lenses. The method of the invention comprises: (1) forming, on a molding surface of a mold, a transferable colored polymeric composite film which comprises or consists essentially of a first polymeric film, a second polymeric film and a cured colored image encapsulated therewithin; (2) dispensing a silicone hydrogel lens formulation into the lens-forming cavity of the mold; and (4) thermally curing the third polymerizable composition within the lens-forming cavity for at least about 40 minutes to form the colored silicone hydrogel contact lens, whereby the transferable, colored, and polymeric composite film detaches from the first or second molding surface and becomes integral with the body of the silicone hydrogel contact lens.

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