Porous polypropylene hollow filaments and method making the same

Details Porous polypropylene hollow filaments and method making the same Porous polypropylene hollow filaments and method making the same

1976-06-23

1977-10-25

Robinson, Ellis

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428400, 428401, 264210F, D02G 300, D01D 512

Patent

active

040556964

ABSTRACT:
There are disclosed porous polypropylene hollow filaments which have a surrounding wall portion of less than 60 .mu., preferably 40 .mu. in thickness which contains many fine holes communicating with each other, distribution curve of radius of said fine holes having at least one maximum points within the range of 200-1200 A. The method for producing said porous polypropylene hollow filaments is also disclosed.

REFERENCES:
patent: 3558764 (1971-01-01), Isaacson
patent: 3630824 (1971-12-01), Rohlig
"Hollow-Fiber Membranes", Encyclo. of Poly. Sci. and Tech., vol. 15, pp. 258-272.
"Hollow Fiber Use in Water Treatment Expands", C&EN, p. 29, 1971 (June 7).

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