Process of making porous polypropylene hollow fiber membrane of

Details Process of making porous polypropylene hollow fiber membrane of Process of making porous polypropylene hollow fiber membrane of

1992-02-06

1993-08-03

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

2642093, 2642095, 264235, 2642888, 2642905, D01D 5247

Patent

active

052326420

ABSTRACT:
A porous polypropylene hollow fiber membrane of large pore diameter which have (a) rectangular pores formed by microfibrils that are oriented in the lengthwise direction of the fibers and joint portions that are composed of stacked lamellae, the pores being contiguous with each other from the inner wall surface to the outer wall surface of the hollow fiber membrane to form a stacked, multicellular structure, (b) an average pore diameter ranging from greater than 1 .mu.m up to 10 .mu.m as measured with a mercury porosimeter, (c) a porosity of 70 to 95%, and (d) an air permeability of not less than 4.times.10.sup.5 l/m.sup.2 .multidot.hr.multidot.0.5 atm can be produced by melt-spinning polypropylene, annealing the resulting unstretched hollow fiber under specific conditions, and then cold-stretching and hot-stretching the annealed hollow fiber under specific conditions.

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