Title:
ガス交換のための一体型非対称ポリオレフィン膜
Document Type and Number:
Japanese Patent JP4791632
Kind Code:
B2
Abstract:
Process for producing hydrophobic polyolefinic membranes for gas exchange via thermally induced liquid-liquid phase separation is disclosed. A solution of at least one polyolefin in a solvent system, of a compound A and a compound B having a viscosity less than 60 mPa s, is extruded to form a shaped object. The compound A is a solvent and compound B preferably a non-solvent of the polymer, and the boiling point of compound A is at least 50° C. higher than that of compound B. After the shaped object leaves the die, at least one surface thereof is subjected to an atmosphere promoting evaporation of compound B, and the shaped object is subsequently cooled until the phase separation and solidification of the high-polymer-content phase take place. The integrally asymmetrical membrane producible in this manner has a porosity of greater than 50% to 75% by volume, a sponge-like, open-pored, microporous support layer without macrovoids and on average isotropic pores, and at least one separation layer with pores <100 nm, if any. The membrane is preferably used for blood oxygenation.
Inventors:
Marx Oscar Muller
Erich Kessler
Ralph Reiner Hornscheid
Frank Wiese
Armin Johannes Lang
Erich Kessler
Ralph Reiner Hornscheid
Frank Wiese
Armin Johannes Lang
Application Number:
JP2000503928A
Publication Date:
October 12, 2011
Filing Date:
July 16, 1998
Export Citation:
Assignee:
Membrana GmbH
International Classes:
A61M1/18; B01D67/00; B01D71/26; B01D69/02; B01D69/08; G01N27/40; G01N27/49
Domestic Patent References:
| JPS57159535A | 1982-10-01 | |||
| JPH01104271A | 1989-04-21 | |||
| JPS58164622A | 1983-09-29 | |||
| JPS573652A | 1982-01-09 | |||
| JPS59196706A | 1984-11-08 |
Foreign References:
| DE3205289A1 | 1983-08-25 |
Attorney, Agent or Firm:
Toshio Yano
Takuya Kuno
Einzel Felix-Reinhard
Takuya Kuno
Einzel Felix-Reinhard