Process of producing porous polypropylene hollow fiber and film
US5435955A · kind A · utility
23Cited by
14References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1994 |
| Grant date | Jul 25, 1995 |
| Priority date | — |
| Expiry date | Jan 13, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process of producing a porous polypropylene hollow fiber or film which comprises a step for forming a large number of micropores in the surrounding wall of said fiber or in said film by drawing a polypropylene hollow fiber or film, which is characterized in that the drawing process is performed at a temperature in the range of 110.degree.-155.degree. C. and at a drawing rate of less than 10%/min.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.