公开(公告)号：US20230350100A1

公开(公告)日：2023-11-02

申请号：US18308189

申请日：2023-04-27

Applicant: Alcon Inc.

Inventor： Lisa Nicole Hutfluss ,  Jing Cheng ,  Feng Jing ,  Steve Yun Zhang ,  Michelle Plavnik

IPC: G02B1/04 ,  B29D11/00

CPC classification number: G02B1/043 ,  B29D11/00134 ,  B29D11/00192 ,  B29K2083/00

Abstract: The invention provides a method for making silicone hydrogel contact lenses in a relatively efficient and consistent manner from a lens formulation (i.e., a polymerizable composition) including a thermal initiator having a 10-hour half-life temperature (T10hλ) under a controlled thermal curing scheme. A method of the invention comprises a step of curing the lens formulation in an oven according to a thermal curing profile that comprises or consists essentially of increasing the oven's temperature from room temperature or a temperature that is at least about 5° C. lower than T10hλ to a temperature that is at least 30° C. higher than T10hλ at a selected rate (e.g., from about 1° C./minute to about 10° C./minute). Under such a controlled thermal curing scheme, the lens diameter of the fully-hydrated silicone hydrogel contact lenses obtained according to a method of the invention does not vary significantly with the positions of the molds in the oven.

公开(公告)号：US20230117502A1

公开(公告)日：2023-04-20

申请号：US18047312

申请日：2022-10-18

Applicant: Alcon Inc.

Inventor： Michelle Plavnik ,  Junhao Ge ,  Steve Yun Zhang ,  Ethan Leveillee ,  Yang Zheng ,  Yuan Chang

IPC: B29D11/00

Abstract: A dosing system and method for delivery of contact lens formulation(s) to a contact lens forming mold. The system includes a carrier portion configured for holding a contact lens mold, and an alignment mandrel configured for retaining a lens formulation delivery device. The lens formulation delivery device is retained in a specified position relative to the contact lens mold for precise location of delivery of the lens formulation within the contact lens mold. A first lens formulation can be dosed to a center location in the mold, and a different second lens formulation can be dosed to a ring-shaped pattern around the center location, to form a contact lens having different center and edge characteristics.

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.

公开(公告)号：US20220137433A1

公开(公告)日：2022-05-05

申请号：US17518423

申请日：2021-11-03

Applicant: Alcon Inc.

Inventor： Yuan Chang ,  Junhao Ge ,  Steve Yun Zhang ,  Michelle Plavnik ,  Augustine Twum Kumi

IPC: G02C7/04 ,  C08J7/18 ,  G02C7/10 ,  G02B1/04 ,  B29D11/00

Abstract: Described herein is a method for producing photochromic contact lenses, in particular, photochromic silicone hydrogel contact lenses. The method comprises a step of cast molding of a lens-forming composition including an iniferter to form an unprocessed contact lens having iniferter moieties covalently incorporated into its polymer matrix and a step of iniferter-induced graft-polymerization of a photochromic vinylic monomer to the polymer matrix only in its central region which is circular and concentric with the central axis of the unprocessed contact lens. The obtained photochromic contact lens has a central pupillary region that only can undergo a reversible color change upon exposure to UV/HEVL-radiation.