Porous polypropylene membrane and methods for production thereof
US5139529A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1989 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Aug 25, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49906
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A porous polypropylene hollow fiber membrane is disclosed which is characterized by the fact that the solid phase in the inner surface region thereof is formed with particles of polypropylene closely fused and joined to give rise to a continuous phase while partially exposed through the surface thereof, the solid phase in the interior and the outer surface region thereof is formed with particles of polypropylene interconnected in the direction of axis of fiber to give rise to a multiplicity of lumps of polypropylene, and the interstices between these solid phases has continuous pores interconnected in the form of a three-dimensional network. When this porous polypropylene hollow fiber membrane is used in an artificial lung, without reference to the choice between the type adapted to pass blood inside the hollow fiber membrane, it exhibits a high gas-exchange capacity without infliction of injury upon blood cells, aggravation of pressure loss, or leakage of blood plasma. Further a flat-film type porous polypropylene membrane possessing a microreticular structure is disclosed which is characterized by the fact that either or both of the opposite surface region of the porous membrane …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.