C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/15, 18/24, 18
C08J 9/28 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 69/08 (2006.01) B01D 71/68 (2006.01) C08J 3/09 (2006.01) D01D 5/24 (2006.01)
Patent
CA 1141510
07-0433 METHODS FOR PREPARING ANISOTROPIC MEMBRANES AND MEMBRANES PRODUCED THEREFROM ABSTRACT OF THE DISCLOSURE Anisotropic membranes are prepared from a solution of a membrane-forming polymer in a liquid carrier. The polymer solution is provided in the form of a precursor and is then coagulated in a liquid coagulant comprising water to form the anisotropic membrane. The liquid carrier used in the methods comprises an N-acylated heterocyclic solvent which can be represented by the structure: Image wherein X is -CH2-, -N(R')- or -O-; R is hydrogen, methyl or ethyl; and R' is hydrogen or methyl. The methods are particularly useful for preparing anisotropic hollow fiber membranes. In forming anisotropic hollow fiber membranes, the solution of hollow fiber-forming polymer in the liquid carrier is extruded through an annular spinnerette to form a hollow fiber precursor, and the hollow fiber precursor is coagulated in a liquid coagulant comprising water to form the hollow fiber membrane, The methods are attractive for producing polysulfone hollow fiber membranes which have a homogeneously-formed, thin selective skin on an open cellular support and which exhibit high resistance to collapse. The membranes are especially useful for the separation of gases,
348807
Brooks Albert A.
Henis Jay M.s.
Kurz James E.
Readling Mike C.
Tripodi Mary K.
Mcfadden Fincham
Monsanto Company
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