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US 5,098,445 AGranted
Ultraviolet radiation absorbing agent for bonding to an ocular lens
AssigneeCiba-Geigy Corporation
InventorsWilliam M. Hung, Kai C. Su
Life of this patent
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Abstract
An ultraviolet radiation absorbing contact lens and method ofl making the same, comprising a copolymeric hydrogel material to which is covalently bonded at least one halotriazine reactive ultraviolet radiation absorbing agent of the formula: ##STR1## where X=Cl or F; E,A=an ultraviolet radiation absorbing component; and E.sup.1 =an aqueous soluble moiety.
Claims8
An ultraviolet radiation absorbing agent for bonding to an ocular lens, wherein said agent has the formula:
- ##STR9## wherein A and E are ultraviolet radiation absorbing components which are either identical to or dissimilar to each other, or of the formula ##STR10## where X=Cl or F;
- A=an ultraviolet radiation absorbing component selected from the group consisting of p-benzoic acid, p-salicyclic acid, substituted benzophenone, substitued benzotriazoles, benzoic acid esters, acrylates, oxalic acid diamides, and hydroxy phenyltriazines;
- E=an ultraviolet radiation absorbing component selected from the group consisting of p-aminobenzoic acid, p-aminosalicylic acid, substituted benzophenone and substituted benzotriazoles, benzoic acid esters, acrylates, oxalic acid diamides, and hydroxy phenyltriazines;
- E.sup.1 =an aqueous soluble moiety of the formula ##STR11## where Y is an amine salt or an alkali metal salt;
- and R.sub.5 -R.sub.6 are selected from the group consisting of hydrogen, alkyl chains varying from C.sub.1 to C.sub.18, C.sub.1 -C.sub.18 alkoxy, halogen, nitro, hydroxy, carboxy, sulfonic acid or a salt thereof.
2 more elements
Dependencies are inferred from the claim text.