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US 5,399,692 AGranted
Ultraviolet absorbing benzophenone sulfonic acid derivatives
AssigneeCiba-Geigy Corporation
InventorsWilliam M. Hung, Kai C. Su
Life of this patent
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Abstract
An ultraviolet radiation absorbing agent for bonding to an ocular lens. The agent has the formula A--NH--B wherein A is an ultraviolet absorbing compound and B is a specific reactive group or a moiety containing reactive group.
Claims7
An ultraviolet radiation-absorbing agent defined by the formula:
- A--NH--B
- wherein said agent is selected from the group consisting of 4'-(3-chloropropionamido)-2-hydroxy-4-methoxy-benzophenone-5-sulfonic acid;
- 4'-[4"-(2-(chloroethylsulfonylmethylphenyl) amido]-2-hydroxy-4-methoxybenzophenone-5-sulfonic acid;
- 4'-[6-(2,4,5-trichloropyriamidinyl)]-amino-2-hydroxy-4-methoxy-benzophenon e-5-sulfonic acid;
- 4'-[6-(2,4-dichloropyrimidinyl)]amino-2-hydroxy-4-methoxy-benzophenone-5-s ulfonic acid;
- 4-[5-(6-(2,4-dichloropyrimidinyl)]aminobenzotriazol-2-yl]-3-hydroxybenzene sulfonic acid;
- 4'-[4"-[2-chloroethylsulfonylphenyl)amino]-2-hydroxy-4-methoxybenzophenone -5-sulfonic acid;
- and salts thereof.
5 more elements
Dependencies are inferred from the claim text.