Porous membrane, blood purifying module incorporating porous membrane, and method for producing porous membrane
AssigneeToray Industries, Inc.
InventorsAkihiro Hayashi, Shiro Nosaka, Yoshiyuki Ueno
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Abstract
The purpose of the present invention is to provide a porous membrane that has both high water permeability and excellent protein fractionation performance. Provided is a method for producing a porous membrane, said method comprising a step for discharging a membrane-forming dope that contains a hydrophilic polymer from a slit formed in a mouthpiece, and a step for, after the passage of the discharged membrane-forming dope through a dry part, solidifying the membrane-forming dope in a coagulation bath to give a porous membrane, wherein the cross-section area of the slit is 3-30 times inclusive as large as the cross-section area of the solidified porous membrane.
Claims14
A porous membrane used for blood purification containing a hydrophilic polymer at a content of at least 0.5% by weight and up to 8% by weight wherein pores formed on one surface satisfy the following (A) and (B):
- (A) average of ratio of the major diameter to the minor diameter of the pores is at least 3, and
- (B) average of the minor diameter of the pores is at least 5 nm and up to 20 nm and a standard deviation is up to 4 nm.
Dependencies are inferred from the claim text.