Hydrogel compositions demonstrating phase separation on contact with aqueous media
US8541021B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 17, 2004 |
| Grant date | Sep 24, 2013 |
| Priority date | — |
| Expiry date | Jan 7, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/5424
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.