Method for preparing ultraviolet radiation absorbing contact len

Details Method for preparing ultraviolet radiation absorbing contact len Method for preparing ultraviolet radiation absorbing contact len

1995-05-24

1997-10-28

Merriam, Andrew E. C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

264 11, 264 138, 264 26, 351160H, 351177, 526320, 5263232, 5263296, 524294, C08L 3304, C08K 509

Patent

active

056818718

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.

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