Melt blowing process

Details Melt blowing process Melt blowing process

1974-05-08

1976-08-31

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264121, 264DIG75, B29C 1706

Patent

active

039781852

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.

REFERENCES:
patent: 3143584 (1964-08-01), Roberts et al.
patent: 3502763 (1970-03-01), Hartmann
patent: 3755527 (1973-08-01), Keller et al.
patent: 3849241 (1974-11-01), Buntin et al.
"Superfine Thermoplastic Fibers" by Wente, Ind. Eng. Chem. vol. 8, No. 8, pp. 1342-1346, Aug. 1956.

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