Wettable silicone hydrogel compositions and methods for their manufacture
First Claim
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1. In a method of making a silicone-containing hydrogel composition by:
- a) providing at least one hydrophilic monomer and at least one silicone-containing monomer to a monomer mix; and
b) curing the monomer mix resulting from step a) to form a silicone-containing hydrogel composition the improvement of which comprisesimproving the wettability of the silicone-containing hydrogel composition, which is characterized by the composition having a contact angle of less than about 25 degrees, by providing from about 0.5 to about 10 weight percent of an amphoteric equimolar mixture of acid-containing and amine-containing comonomers different from the hydrophilic monomers of step a) to the monomer mix of step a).
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Abstract
Improved silicone-containing hydrogels with enhanced wettability comprising at least one silicone-containing prepolymer, and an equimolar amphoteric mixture of acid-containing comonomers and amine-containing comonomers are herein disclosed.
325 Citations
30 Claims
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1. In a method of making a silicone-containing hydrogel composition by:
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a) providing at least one hydrophilic monomer and at least one silicone-containing monomer to a monomer mix; and b) curing the monomer mix resulting from step a) to form a silicone-containing hydrogel composition the improvement of which comprises improving the wettability of the silicone-containing hydrogel composition, which is characterized by the composition having a contact angle of less than about 25 degrees, by providing from about 0.5 to about 10 weight percent of an amphoteric equimolar mixture of acid-containing and amine-containing comonomers different from the hydrophilic monomers of step a) to the monomer mix of step a). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In an improved silicone-containing hydrogel composition formed by at least one hydrophilic monomer and at least one silicone-containing monomer incorporated into a monomer mix which is cured into a silicone-containing hydrogel composition, the improvement of which comprises:
improving the weltability of the silicone-containing hydrogel composition by having a contact angle of less than about 25 degrees by providing an amphoteric equimolar mixture of acid-containing and amine-containing comonomers different from the hydrophilic monomer in an amount of from about 0.5 to about 10 weight percent into the monomer mix. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
Specification