Asymmetrical layered structures of polyalkylene sulfone resins
US4568579A · kind A · utility
17Cited by
2References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 3, 1983 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Nov 3, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31931
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Asymmetrical layered structures such as asymmetrical films are disclosed. The main body section contains a multitude of pores (voids). A thin surface skin is free of pores. The entire structure is fabricated from a polyalkylene sulfone resin in which the alkylene moiety contains 6 to 18 carbon atoms. Processes for preparing the structures also are disclosed. The structures are semi-permeable to gases and are used as membranes to enrich the oxygen content of oxygen/nitrogen mixtures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.