Granted Patent
B2
US 7,709,652 · App. 12/125,403 · Granted May 4, 2010
Dual function UV-absorbers for ophthalmic lens materials
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Abstract
Disclosed are UV absorbers that contain a labile functional group capable of initiating free radical polymerization.
Claims (6)
1. A dual function UV absorber of the formula:
where Q is —H, —CH 3 , —CH 2 CH 3 , —CH(CH 3 )CH 3 , or —C(CH 3 ) 3 ,
T is nothing, —(CH 2 ) z , or —(OCH 2 CH 2 ) z , where z= 1 -10
G is —R, —OR, —NHR, —NRR′, —CO 2 R, or —COR, where R=a benzotriazole or benzophenone UV absorber, and R′═—OH 3 or —CH 2 CH 3 .
2. An ophthalmic lens material comprising a dual function UV absorber of claim 1 .
3. The ophthalmic lens material of claim 2 wherein the dual function UV absorber is present in the ophthalmic lens material in an amount of 1-5% (w/w).
Assignments (2)
CONFIRMATORY DEED OF ASSIGNMENT EFFECTIVE APRIL 8, 2019
Recorded Dec 10, 2019
From: NOVARTIS AG
To: ALCON INC.
Reel/Frame 051454/0788 →