Use of surfactants in extraction procedures for silicone...

Details Use of surfactants in extraction procedures for silicone... Use of surfactants in extraction procedures for silicone...

2011-06-28

2011-06-28

Del Sole, Joseph S (Department: 1743)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Nonmechanical aftertreatment

C264S001320, C425S808000, C425S403100, C106S038220, C106S038900

Reexamination Certificate

active

07968018

ABSTRACT:
Methods of producing silicone hydrogel ophthalmic lenses include contacting one or more delensed silicone hydrogel ophthalmic lens with a liquid composition that contains alcohol, water, and a surfactant. The methods can be steps of an extraction/hydration procedure used in the production of silicone hydrogel contact lenses. In some examples, contacting silicone hydrogel ophthalmic lens products with a liquid composition that contains alcohol, water, and a surfactant can significantly reduce or prevent surface distortion of the ophthalmic lens resulting from the extraction procedure. Some methods include subsequently contacting the silicone hydrogel ophthalmic lens with a liquid composition consisting essentially of water and a surfactant.

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