C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
18/25
C08L 1/06 (2006.01)
Patent
CA 1216110
ABSTRACT A porous regenerated cellulose membrane consisting essentially of cellulose molecules having a viscosity average molecular weight of at least about 5 x 104, the crystalline region of the cellu- lose molecules being substantially cellulose II crystal, cellulose III-2 crystal or mixtures 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°C measured with a frequency of 110 Hz at about 1.5 x 108 (100-Pr?) dyn/cm2 wherein Pr? is a porosity by percentage, a mean pore size represented by D(µm) of about 0.01 µm to about 20 µm 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 cm2 of about 6 x 105/D to about 3 x 107/D; and a process for preparing a porous regenerated cellulose membrane which comprises casting a cuprammonium solution of cellulose having a viscosity average molecular weight of at least about 5 x 104 in an atomosphere containing at least one organic solvent having a boiling point of at most about 100°C and a solubility in water of at least about 10 % by weight and having no hydroxyl group so as to cause micro-phase separation and regenerating the membrane with an acid and washing the membrane with water.
416225
Inoue Mamoru
Iwata Michitaka
Manabe Seiichi
Asahi Kasei Kogyo Kabushiki Kaisha
Macrae & Co.
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