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US 5,451,617 AGranted
Wettable silicone hydrogel compositions and methods for their manufacture
AssigneeBausch & Lomb Incorporated
InventorsYu-Chan Lai, Paul J. Valint, Jr.
Life of this patent
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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.
Claims30
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 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).
1 more element
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.
Dependencies are inferred from the claim text.