Porous polypropylene hollow filaments and method making the same
US4055696A · kind A · utility
46Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1976 |
| Grant date | Oct 25, 1977 |
| Priority date | — |
| Expiry date | Jun 23, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/298
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
There are disclosed porous polypropylene hollow filaments which have a surrounding wall portion of less than 60 .mu., preferably 40 .mu. in thickness which contains many fine holes communicating with each other, distribution curve of radius of said fine holes having at least one maximum points within the range of 200-1200 A. The method for producing said porous polypropylene hollow filaments is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.