Process for the production of polypropylene fibrids
US4450125A · kind A · utility
1Cited by
9References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1979 |
| Grant date | May 22, 1984 |
| Priority date | — |
| Expiry date | May 7, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01D5/11
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for the production of polypropylene fibrids of short length by abrupt expansion of a liquid mixture of molten polypropylene, an alkane solvent for the polypropylene, and a minor amount of a non-solvent for the polypropylene. The mixture, which is at a high temperature and high pressure, is ejected through an expansion orifice to instantaneously vaporize the alkane and to solidify the polypropylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.