Porous polymeric particle comprising polyvinyl alcohol and having interior to surface porosity-gradient
US7842377B2 · kind B2 · utility
120Cited by
315References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 2008 |
| Grant date | Nov 30, 2010 |
| Priority date | — |
| Expiry date | Jan 20, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A composition includes a plurality of particles. At least some of the plurality of particles include cross-linked polyvinyl alcohol and have a diameter of about 500 microns or less. The particles have a first average pore size in an interior region, and a second average pore size at a surface region. The first average pore size being greater than the second average pore size. The composition also includes a carrier fluid. The plurality of particles being in the carrier fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.