Patent · US Active

Method for making silicone hydrogel contact lenses

US11427685B2 · kind B2 · utility

0Cited by

66References

20Claims

0Family size

Assignee

ALCON INC. · CH

Inventors

Daqing Wu · Suwanee, US
Steve Yun Zhang · Sugar Hill, US
Junhao Ge · Johns Creek, US
Richard Charles Breitkopf · Dunwoody, US
Augustine Twum Kumi · Grayson, US
Weihong Lang · Suwanee, US

Key dates

Filing date	Mar 27, 2019
Grant date	Aug 30, 2022
Priority date	—
Expiry date	Mar 6, 2041

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G2210/00
WIPO fieldOther special machines
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.