Back to results
US 5,681,871 AGranted
Method for preparing ultraviolet radiation absorbing contact lenses
AssigneeJohnson & Johnson Vision Products, Inc.
InventorsFrank F. Molock, Ivan M. Nunez, James D. Ford
Life of this patent
Estimating the term…
Abstract
Disclosed is a process for producing an ultraviolet radiation absorbing contact lens from a lens shaped polymer having hydroxyl groups pendant therefrom and having dispersed therein a UV absorbing agent substituted with at least one anhydride group which is exposed to basic conditions such that the hydroxyl groups react with the anhydride groups on the UV absorbing agent. As a result the UV absorbing agent becomes fixed to the polymer through the formation of a covalent ester bond.
Claims14
A process for producing a UV absorbing contact lens comprising the steps of:
- (a) providing a lens-shaped polymer having hydroxyl groups pendant therefrom from a homogeneous monomer solution comprising therein one or more polymerizable monomers including at least one polymerizable hydroxyl-substituted monomer, wherein said solution contains dispersed therein a UV-absorbing agent substituted with at least one anhydride group, under conditions effective to polymerize said one or more polymerizable monomers without causing said UV-absorbing agent to react;
- and
- (b) exposing said polymer to basic conditions effective to cause said hydroxyl groups to react with anhydride groups on said UV-absorbing agent, whereby said UV-absorbing agent becomes covalently bound with said polymer.
Dependencies are inferred from the claim text.