Melt blowing process
US3978185A · kind A · utility
239Cited by
4References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 8, 1974 |
| Grant date | Aug 31, 1976 |
| Priority date | — |
| Expiry date | May 8, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/75
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Melt blown non-woven mats prepared from thermoplastic polymer fibers and substantially completely free of polymer shot are produced at high polymer throughput rates in an improved melt blowing process in which thermoplastic polymer resins, preferably polypropylene, having initial intrinsic viscosities of at least 1.4, are degraded, optionally in the presence of a free radical source compound, to have both reduced intrinsic viscosities and an apparent viscosity in the melt-blowing nozzle orifices of from about 50 to about 300 poise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.