Process for making ophthalmic lenses
First Claim
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1. A process comprising (a) curing in a mold a reaction mixture comprising at least one silicone containing component wherein said reaction mixture is substantially free from sparingly water soluble components or impurities having a retention time, relative to TRIS of less than about 0.9 to form a lens;
- (b) contacting said lens and mold with an aqueous solution at a temperature less than 99°
C. for less than about 1 hour;
to release said lens from the mold and (c) optionally post processing the lens, wherein said post processing, if conducted, is conducted with aqueous solutions for a time less than 6 hours.
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Abstract
The present invention relates to aqueous processes for the production of silicone hydrogel contact lenses.
52 Citations
47 Claims
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1. A process comprising
(a) curing in a mold a reaction mixture comprising at least one silicone containing component wherein said reaction mixture is substantially free from sparingly water soluble components or impurities having a retention time, relative to TRIS of less than about 0.9 to form a lens; -
(b) contacting said lens and mold with an aqueous solution at a temperature less than 99°
C. for less than about 1 hour;
to release said lens from the mold and(c) optionally post processing the lens, wherein said post processing, if conducted, is conducted with aqueous solutions for a time less than 6 hours. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A process for producing an ophthalmic lens which does not cause ocular discomfort when worn by a human comprising the steps of
(a) curing in a mold a silicone containing reaction mixture comprising less than about 3000 ppm of any sparingly water soluble component or impurity having a retention time, relative to TRIS of less than about 0.9 minutes to form said ophthalmic lens; -
b) contacting said lens and mold with an aqueous solution at a temperature less than 99°
C. for less than about 1 hour;
to release said lens from the mold and(c) optionally post processing the lens, wherein said post processing, if conducted, is conducted with aqueous solutions for a time less than 6 hours.
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25. A process comprising
(a) curing in a mold a reaction mixture comprising at least one silicone containing component, and at least one sparingly water soluble component or impurity having a retention time, relative to TRIS of less than about 0.9 to produce a cured contact lens having less than an ocular discomfort causing amount of said component or impurity, (b) contacting said lens and mold with an aqueous solution at a temperature less than 99° - C. for less than about 1 hour;
to release said lens from the mold and(c) optionally post processing the lens, wherein said post processing, if conducted, is conducted with aqueous solutions for a time less than 6 hours. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
- C. for less than about 1 hour;
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47. A process comprising
(a) curing in a mold a silicone containing reaction mixture wherein all reaction mixture components and impurities which are sparingly water soluble have a retention time, relative to TRIS of at least about 1 to form a lens; -
(b) contacting said lens and mold with an aqueous solution at a temperature less than 99°
C. for less than about 1 hour;
to release said lens from the mold and(c) optionally post processing the lens, wherein said post processing, if conducted, is conducted with aqueous solutions for a time less than 6 hours.
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Specification