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.