公开(公告)号：US20190300654A1

公开(公告)日：2019-10-03

申请号：US16365973

申请日：2019-03-27

Applicant: Alcon Inc.

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

IPC: C08G77/442 ,  G02B1/04 ,  B29D11/00

Abstract: The invention provides a method for making silicone hydrogel contact lenses. The method of the invention is characterized by using an organic solvent as a processing-aid tool for controlling lens diameter without significantly affecting lens equilibrium water content during cast-molding of soft contact lenses from a polymerizable composition. By adjusting the weight percentage of the organic solvent in a polymerizable composition for making SiHy contact lenses, one can adjust lens diameter of produced SiHy lenses to meet target without affecting adversely the lens properties.