Microporous polyester membranes and polymer assisted phase inversion process for their manufacture
US3957651A · kind A · utility
77Cited by
7References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1975 |
| Grant date | May 18, 1976 |
| Priority date | — |
| Expiry date | Apr 30, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Microporous membrane filters composed of polyesters derived from aromatic dibasic acids and especially polytetramethylene terephthalate are produced. These membranes are produced by a polymer assisted phase inversion process involving casting a solution of the polyester and assisting polymer to form a film, evaporating the solvent to form a membrane having inchoate micropores filled with the assisting polymer and subsequently at least partially leaching out the assiting polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.