Dual function UV-absorbers for ophthalmic lens materials
View Patent ↗Disclosed are UV absorbers that contain a labile functional group capable of initiating free radical polymerization.
1. A dual function UV absorber of the formula:
where Y=nothing or O; R=a benzotriazole or benzophenone UV absorber; R′=a benzotriazole or benzophenone UV absorber; —(CH 2 ) n H (n=1-18); —CH(CH 3 )CH 3 ; —C(CH 3 ) 3 ; —C 6 H 5 ; —CH(CH 3 )CH 2 CH 3 ; —C(CH 3 ) 2 CH 2 C(CH 3 ) 3 ; —C(CH 3 ) 2 (CH 2 ) 4 H; —C(CH 2 CH 3 ) 2 (CH 2 ) 4 H; —C(CH 3 ) 2 (CH 2 ) 5 H; —C(CH 2 CH 3 ) 2 (CH 2 ) 5 H; —C(CH 3 ) 2 (CH 2 ) 6 H; —C(CH 2 CH 3 ) 2 (CH 2 ) 6 H; —CH 2 CH(CH 2 CH 3 )(CH 2 ) 4 H; or
2. A dual function UV absorber of the formula:
where R=a benzotriazole or benzophenone UV absorber; R′=H; a benzotriazole or benzophenone UV absorber; (CH 2 ) n H (n=1-18); CH(CH 3 )CH 3 ; C(CH 3 ) 3 ; CH(CH 3 )CH 2 CH 3 ; C(CH 3 ) 2 CH 2 C(CH 3 ) 3 ; C(CH 3 ) 2 (CH 2 ) 4 H; C(CH 2 CH 3 ) 2 (CH 2 ) 4 H; C(CH 3 ) 2 (CH 2 ) 5 H; C(CH 2 CH 3 ) 2 (CH 2 ) 5 H; C(CH 3 ) 2 (CH 2 ) 6 H; C(CH 2 CH 3 ) 2 (CH 2 ) 6 H; CH 2 CH(CH 2 CH 3 )(CH 2 ) 4 H; or C(CH 3 ) 2 C 6 H 5 .
3. An ophthalmic lens material comprising a dual function UV absorber of claim 1 .
4. The ophthalmic lens material of claim 3 wherein the dual function UV absorber is present in the ophthalmic lens material in an amount of 1-5% (w/w).
5. An ophthalmic lens material comprising a dual function UV absorber of claim 2 .
6. The ophthalmic lens material of claim 5 wherein the dual function UV absorber is present in the ophthalmic lens material in an amount of 1-5% (w/w).