Porous regenerated cellulose membrane and process for the prepar

Details Porous regenerated cellulose membrane and process for the prepar Porous regenerated cellulose membrane and process for the prepar

1982-11-19

1986-04-08

Spear, Frank

Liquid purification or separation

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264 41, B01D 1300

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active

045811407

ABSTRACT:
A porous regenerated cellulose membrane consisting essentially of cellulose molecules having a viscosity average molecular weight of at least about 5.times.10.sup.4, the crystalline region of the cellulose molecules being substantially cellulose II crystal, cellulose III-2 crystal or the mixture thereof and having a degree of crystal orientation at a face of (101) in the crystalline region in the direction of the surface of the membrane of at most about 40%, the membrane having a dynamic modulus at 30.degree. C. measured with a frequency of 110 Hz of at least about 1.5.times.10.sup.8 (100-pr.rho.) dyn/cm.sup.2 wherein Pr.rho. is a porosity by percentage, a mean pore size represented by D(.mu.m) of about 0.01 .mu.m to about 20 .mu.m and at the same time a porosity in a plane of at least one plane of at least about 30% or a number of pores in a plane per 1 cm.sup.2 of about 6.times.10.sup.5 /D to about 3.times.10.sup.7 /D; and a process for preparing the same.

REFERENCES:
patent: 3592953 (1971-07-01), Ward, III et al.
patent: 4388256 (1983-06-01), Ishida et al.
Meltzer, et al., "Optimized Cellulose Membranes for Artificial Kidney Dialysis Applications", from vol. XIV, Trans. Am. Soc. Art. Int. Organs, pp. 12-18, 1968.

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