Hydrogel compositions demonstrating phase separation on contact with aqueous media
First Claim
1. A body surface contacting composition comprising:
- (a) a first water-swellable acrylate-based polymer having a pH-dependent solubility and insoluble in water at a pH less than about 5.5,(b) a blend of a poly(N-vinyl lactam) and a complementary oligomer capable of hydrogen bonding to the poly(N-vinyl lactam); and
(c) a second water-swellable acrylate-based polymer that is insoluble in water independent of pH;
in a solvent or mixture of solvents,wherein the weight ratio of the first to second water-swellable acrylate-based polymers is in a range of about 1.5;
1 to 2;
1 and the poly(N-vinyl lactam) represents about 1-30 weight percent of the composition, such that when the composition is placed in an aqueous environment at a pH of from about 6-8, the second water-swellable acrylate-based polymer forms a film over the remainder of the composition.
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Abstract
A composition is provided, wherein the composition comprises a water-swellable, water-insoluble polymer or a water-soluble polymer, a blend of a hydrophilic polymer and a complementary oligomer capable of hydrogen bonding to the hydrophilic polymer. The composition also includes a second water-swellable, water-insoluble polymer that provides for a phase separating film forming composition. Active ingredients, such as a whitening agent, may be included. The composition finds utility as an oral dressing, for example, a tooth whitening composition that is applied to the teeth in need of whitening, and removed when the degree of whitening has been achieved. In certain embodiments, the composition is translucent. Methods for preparing and using the compositions are also disclosed.
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Citations
43 Claims
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1. A body surface contacting composition comprising:
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(a) a first water-swellable acrylate-based polymer having a pH-dependent solubility and insoluble in water at a pH less than about 5.5, (b) a blend of a poly(N-vinyl lactam) and a complementary oligomer capable of hydrogen bonding to the poly(N-vinyl lactam); and (c) a second water-swellable acrylate-based polymer that is insoluble in water independent of pH; in a solvent or mixture of solvents, wherein the weight ratio of the first to second water-swellable acrylate-based polymers is in a range of about 1.5;
1 to 2;
1 and the poly(N-vinyl lactam) represents about 1-30 weight percent of the composition, such that when the composition is placed in an aqueous environment at a pH of from about 6-8, the second water-swellable acrylate-based polymer forms a film over the remainder of the composition. - 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, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 43)
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41. A method of manufacturing a composition, comprising admixing in a mixture of solvents:
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(a) a first water-swellable acrylate-based polymer having a pH dependent solubility and insoluble in water at a pH less than about 5.5, (b) poly(N-vinyl lactam), (c) a complementary oligomer capable of hydrogen bonding to the poly(N-vinyl lactam), (d) a second water-swellable acrylate-based polymer that is insoluble in water independent of pH, and (e) an active agent; wherein the weight ratio of the first to second water-swellable acrylate-based polymers is in a range of about 1.5;
1 to 2;
1, the poly(N-vinyl lactam) represents about 1-30 weight percent of the composition and the active agent represents about 1-40 weight percent of the composition including the solvents, to thereby form a liquid composition which, upon contact with a moist body surface, undergoes phase separation such that the second water swellable acrylate-based polymer forms a film over the remainder of the composition.- View Dependent Claims (42)
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Specification