Method for applying a coating onto a silicone hydrogel lens
First Claim
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1. A method of applying a hydrophilic coating onto a silicone hydrogel contact lens, comprising the steps of:
- (a) contacting the contact lens with a first coating solution having a temperature of from about 45°
C. to about 95°
C. to form a prime coating which is not covalently attached to the contact lens, wherein the first coating solution includes a polyaionic material having a first hydrophobic backbone and multiple ionizable pendant groups, wherein the first coating solution has a pH sufficient low to substantially prevent the ionizable groups from ionizing, wherein the prime coating comprises at least one layer of the polyanionic material; and
(b) contacting said contact lens with a second coating solution having a temperature of from about 45°
C. to about 95°
C. to form a top coating over the prime coating, wherein the second coating solution contains a non-charged hydrophilic polymer having a second hydrophobic backbone, wherein the top coating comprises at least one layer of the hydrophilic polymer.
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Abstract
The invention provides a cost-effective method for making a silicone hydrogel contact lens having an LbL coating thereon that is not covalently attached to the lens and has good hydrophilicity, intactness and durability. The method comprises LbL coating at high temperature.
96 Citations
20 Claims
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1. A method of applying a hydrophilic coating onto a silicone hydrogel contact lens, comprising the steps of:
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(a) contacting the contact lens with a first coating solution having a temperature of from about 45°
C. to about 95°
C. to form a prime coating which is not covalently attached to the contact lens, wherein the first coating solution includes a polyaionic material having a first hydrophobic backbone and multiple ionizable pendant groups, wherein the first coating solution has a pH sufficient low to substantially prevent the ionizable groups from ionizing, wherein the prime coating comprises at least one layer of the polyanionic material; and(b) contacting said contact lens with a second coating solution having a temperature of from about 45°
C. to about 95°
C. to form a top coating over the prime coating, wherein the second coating solution contains a non-charged hydrophilic polymer having a second hydrophobic backbone, wherein the top coating comprises at least one layer of the hydrophilic polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A silicone hydrogel contact lens, comprising:
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a core silicone hydrogel material; and a hydrophilic coating, wherein the core silicone hydrogel material is the copolymerization product of a silicone hydrogel lens-forming material, wherein the silicone-hydrogel lens-forming material comprises at least one member selected from the group consisting of a silicone-containing vinylic monomer, a silicone-containing macromer with ethylenically unsaturated groups, a crosslinkable silicone-containing prepolymer, and mixtures thereof, wherein the hydrophilic coating is not covalently attached to the core silicone hydrogel material and comprises one innermost layer of a polyionic polymeric material with a first hydrophobic backbone and one outmost layer of a non-charge hydrophilic polymer with a second hydrophobic backbone, wherein the silicone hydrogel contact lens has an oxygen permeability of at least 40 barres, wherein the hydrophilic coating has an averaged water contact angle of 80 degrees or less, a good intactness characterized by its incapability of being stained by Sudan Black dye, and a good durability characterized by surviving a digital rubbing test or repeated autoclave test. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification