Surface-modified hydrogels and hydrogel microparticles
First Claim
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1. A method for the preparation of surface-modified hydrogels and hydrogel microparticles, comprising:
- treating in the presence of oxygen a hydrogel comprising Component (A), at least one water-compatible organic polymer, alcohol-compatible organic polymer, or any combination thereof, wherein Component (A) is selected from polyacrylic acid, poly(meth)acrylic acid, salts of polyacrylic acid, salts of polymethacryliccr lic anhydride, polyacrylic anhydride, and any combination thereof, withComponent (B), at least one free-radical polymerizable organopolysiloxane that is immiscible with water, water-compatible alcohols, or combinations thereof, and that is selected from acrylate and methacrylate-functional polydimethylsiloxanes and acrylate and methacrylate-functional silanes,at least one suitable water-immiscible solvent for Component (B) selected from hexamethyldisiloxane, octamethyltrisiloxane, and decamethyltetrasiloxane, andComponent (C), at least one organoborane free radical initiator;
whereinthe hydrogel is fully-or partially-swollen with an absorbable solvent selected from water, alcohols, and any combination thereof, prior to the treating with each of the Component (B), the at least one suitable solvent for Component (B), and the Component (C),the hydrogel is at least one of a non-flowable monolith, a sheared or pulverized monolith, and microparticles, andthe treating forms at least one modified surface on the hydrogel or hydrogel microparticles.
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Abstract
Provided in various embodiments are surface-modified hydrogels and hydrogel microparticles, methods for their preparation, and uses thereof for delivery of personal care and healthcare active ingredients, and agricultural active ingredients. In some embodiments, such hydrogels and hydrogel microparticles comprise surface coatings that are resistant to solvent washing and can act as barriers for the migration of water and/or water-compatible alcohols and actives soluble therein.
16 Citations
18 Claims
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1. A method for the preparation of surface-modified hydrogels and hydrogel microparticles, comprising:
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treating in the presence of oxygen a hydrogel comprising Component (A), at least one water-compatible organic polymer, alcohol-compatible organic polymer, or any combination thereof, wherein Component (A) is selected from polyacrylic acid, poly(meth)acrylic acid, salts of polyacrylic acid, salts of polymethacryliccr lic anhydride, polyacrylic anhydride, and any combination thereof, with Component (B), at least one free-radical polymerizable organopolysiloxane that is immiscible with water, water-compatible alcohols, or combinations thereof, and that is selected from acrylate and methacrylate-functional polydimethylsiloxanes and acrylate and methacrylate-functional silanes, at least one suitable water-immiscible solvent for Component (B) selected from hexamethyldisiloxane, octamethyltrisiloxane, and decamethyltetrasiloxane, and Component (C), at least one organoborane free radical initiator; wherein the hydrogel is fully-or partially-swollen with an absorbable solvent selected from water, alcohols, and any combination thereof, prior to the treating with each of the Component (B), the at least one suitable solvent for Component (B), and the Component (C), the hydrogel is at least one of a non-flowable monolith, a sheared or pulverized monolith, and microparticles, and the treating forms at least one modified surface on the hydrogel or hydrogel microparticles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for the preparation of surface-modified hydrogels and hydrogel microparticles, comprising:
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treating in the presence of oxygen a hydrogel comprising Component (A), at least one water-compatible organic polymer, alcohol-compatible organic polymer, or any combination thereof, wherein Component (A) is polyacrylic acid, with Component (B), at least one free-radical polymerizable organopolysiloxane that is immiscible with water, water-compatible alcohols, or combinations thereof, and that is a methacryloxypropyldimethylsiloxy-terminated polydimethylsiloxane, at least one suitable water-immiscible solvent for Component (B) that is hexamethyldisiloxane, and Component (C), at least one organoborane free radical initiator; wherein the hydrogel is fully-or partially-swollen with an absorbable solvent that is water prior to the treating with each of the Component (B), the at least one suitable solvent for Component (B), and the Component (C), the hydrogel is at least one of a non-flowable monolith, a sheared or pulverized monolith, and microparticles, and the treating forms at least one modified surface on the hydrogel or hydrogel microparticles. - View Dependent Claims (18)
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Specification