Process for making silicone containing hydrogel lenses
First Claim
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1. A process for preparing silicone hydrogel contact lenses, said process comprising:
- (a) providing a monomeric mixture comprising a silicone-containing monomer, a hydrophilic monomer and an organic diluent;
(b) charging the monomeric mixture to a mold and curing the formulation in the mold to obtain a shaped article;
(c) removing diluent from the shaped article to improve machineability of the shaped article; and
(d) machining the shaped article to obtain a contact lens having a desired configuration.
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Abstract
A process for preparing silicone hydrogel contact lenses where machining operations are employed to produce a lens having a desired final shape. The silicone hydrogel contact lenses are prepared by:
providing a monomeric mixture comprising a silicone-containing monomer, a hydrophilic monomer and an organic diluent;
charging the mixture to a mold and curing the formulation in the mold to obtain a shaped article;
removing organic diluent from the shaped article to improve machineability of the article; and
machining the shaped article to obtain a contact lens having a desired configuration.
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Citations
20 Claims
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1. A process for preparing silicone hydrogel contact lenses, said process comprising:
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(a) providing a monomeric mixture comprising a silicone-containing monomer, a hydrophilic monomer and an organic diluent; (b) charging the monomeric mixture to a mold and curing the formulation in the mold to obtain a shaped article; (c) removing diluent from the shaped article to improve machineability of the shaped article; and (d) machining the shaped article to obtain a contact lens having a desired configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification