Process for thermoformed articles

Details Process for thermoformed articles Process for thermoformed articles

B - Operations, Transporting

29

C

18/1166, 18/1216

B29C 51/00 (2006.01)

Patent

CA 1241172

32889 CAN 8A -1- Abstract of the Disclosure A process for preparing shaped articles and shaped hydrogel articles including contact lenses comprises the steps of preparing a polymer or copolymer comprising units derived from an ethylenically-unsaturated monomer bearing at least one trihaloacetoxy-substituent group, thermoforming said polymer by heating in a mold or in sheet-form at a temperature in the range of 100 to 400°C for about 5 seconds to 15 minutes, and then cooling said polymer, to provide a shaped article, optionally, 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.

455034

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