The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 2024
Filed:
Oct. 27, 2021
Alcon Inc., Fribourg, CH;
Junhao Ge, Redwood City, CA (US);
Yuan Chang, Atlanta, GA (US);
Steve Yun Zhang, Sugar Hill, GA (US);
Michelle Plavnik, Atlanta, GA (US);
Augustine Twum Kumi, Grayson, GA (US);
Daqing Wu, Suwanee, GA (US);
Alcon Inc., Fribourg, CH;
Abstract
Described herein is a method for producing photochromic silicone hydrogel contact lenses in a relatively efficient and consistent manner from a polymerizable composition under a controlled thermal curing scheme. The main polymerizable components in the polymerizable composition are a high radical-reactive hydrophilic (meth)acrylamido monomer, a high radical-reactive siloxane-containing (meth)acrylamido monomer, and a polysiloxane vinylic crosslinker(s) free of low-reactive ethylenically unsaturated group as the main crosslinker. The thermal free radical initiator having a 10 hour half-life temperature (T) of from about 50° C. to about 90° C. The controlled thermal curing scheme includes maintaining a first curing temperature of from about (T−20)° C. to about T° C. for a first curing time and maintaining a second curing temperature of from about (T+10)° C. to about (T+35)° C. for a second curing time.