High wet-strength polyolefin blown microfiber web
US4933229A · kind A · utility
40Cited by
8References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1989 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Apr 21, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/626
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A polyolefin BMF web made from a mixture of polypropylene and surfactant can have high wet strength when (a) the surfactant is nonionic and (b) the surfactant is mixed with the polypropylene at a static mixer that interconnects the extruder and the BMF die. By so postponing the addition of the surfactant, it is protected from both the exceedingly high temperatures of the extruder and from the high shearing forces within the extruder. The surfactant also is heated to high temperatures for a much shorter time than if it were premixed with the polypropylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.