Permeable compositions and methods for their preparation
US6255359A · kind A · utility
43Cited by
49References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1997 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Dec 23, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention involves compositions having variable permeation and/or porosity and objects made therefrom. The compositions are prepared by dispersing a pore-forming agent in a polymer matrix by agitation. The composition is density developed resulting in a variable concentration in pore-forming agent throughout the mixture through application of an external force on the mixture with or without continued agitation. The pore-forming agent is then leached from the mixture to form a polymer matrix having variable permeability and/or porosity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.