Microporous membrane with a stratified pore structure created in situ and process
US6235377A · kind A · utility
34Cited by
12References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1995 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Sep 5, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31663
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A microporous membrane is described comprising at least two layers, wherein each layer is characterized by nodes interconnected by fibrils, the layers are bonded by means of plastic flow at temperatures below the melting point of either membrane material, and the pore architecture is formed in situ by an expansion process. A stratified microporous membrane is produced wherein the pore architecture of each layer may be discretely controlled. The article is useful for filtration and medical applications where a pore size gradient is required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.