Hydroxy-substituted polymeric shaped hydrogel article

Details Hydroxy-substituted polymeric shaped hydrogel article Hydroxy-substituted polymeric shaped hydrogel article

1988-08-17

1990-05-01

Lowe, James

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

Synthetic resins

Processes of preparing a desired or intentional composition...

525 60, 525 62, 5253262, 5253306, 525369, 525378, 526245, 5262921, 5262923, 5262924, G02B 104, C08F 1606, C08F 1820

Patent

active

049218840

ABSTRACT:
Articles including ophthalmic devices prepared by a process comprising the steps of thermoforming a polymer comprising units derived from an ethylenically-unsaturated monomer bearing at least one trihaloacetoxy-substituent group, by heating the polymer in a mold or in sheet-form at a temperature in the range of 100.degree. to 400.degree. C. for about 5 seconds to 15 minutes, and then cooling said polymer, to provide a shaped article, solvolyzing the resulting shaped article to provide a hydroxy-substituted polymeric shaped article, and optionally hydrating said hydroxy-substituted polymeric shaped article to provide a shaped hydrogel article. When the polymer is derived from vinyl trihaloacetate it has a syndiotactic stereochemical configuration.

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