Process of forming a hydroxy-substitute polymeric shaped article

Details Process of forming a hydroxy-substitute polymeric shaped article Process of forming a hydroxy-substitute polymeric shaped article

1987-02-26

1988-11-22

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Nonmechanical aftertreatment

264232, 26433114, 26433118, 264340, 264343, B29D 1100

Patent

active

047864460

ABSTRACT:
A process for preparing shaped articles and shaped hydrogel articles including ophthalmic devices 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.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.

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