MICROPOROUS AND HYDROPHOBIC POLYMERIC HOLLOW FIBER MEMBRANES AND METHODS FOR PREPARATION THEREOF
First Claim
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1. A method for preparing a microporous hollow fiber membrane, which comprises:
- mixing at least one polymer suitable for melt extrusion with at least one suitable water soluble salt having an average particle size of about 1 to about 20μ
m under conditions suitable to form a mixture comprising about 35 to about 70% by weight of the at least one suitable water soluble salt based on the total weight of the mixture;
extruding the mixture under conditions suitable to form a hollow fiber membrane comprising the mixture; and
leaching the hollow fiber membrane comprising the mixture in water under conditions suitable for at least substantially removing the salt from the hollow fiber membrane.
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Abstract
There is provided a method for preparing microporous hollow fiber membranes comprising melt-extruding a polymer-salt blend followed by salt leaching. Microporous hollow fiber membranes are also disclosed.
14 Citations
35 Claims
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1. A method for preparing a microporous hollow fiber membrane, which comprises:
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mixing at least one polymer suitable for melt extrusion with at least one suitable water soluble salt having an average particle size of about 1 to about 20μ
m under conditions suitable to form a mixture comprising about 35 to about 70% by weight of the at least one suitable water soluble salt based on the total weight of the mixture;extruding the mixture under conditions suitable to form a hollow fiber membrane comprising the mixture; and leaching the hollow fiber membrane comprising the mixture in water under conditions suitable for at least substantially removing the salt from the hollow fiber membrane. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 12, 17, 18, 19, 20, 22, 24, 26, 27, 28)
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7. (canceled)
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10-11. -11. (canceled)
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13-16. -16. (canceled)
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21. (canceled)
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23. (canceled)
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25. (canceled)
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29. (canceled)
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30. A microporous hydrophobic hollow fiber membrane comprising :
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a porosity of about 10 to about 80%; a mean roughness (Ra) of about 100 nm to about 1000 nm; a water contact angle of about 110 to about 140°
; andmicroporous pores having a diameter of about 0.1 to about 1000 μ
m.
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31-33. -33. (canceled)
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34. A microporous hollow fiber membrane prepared by a method for preparing a microporous hollow fiber membrane, which comprises:
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mixing at least one polymer suitable for melt extrusion with at least one suitable water soluble salt under conditions suitable to form a polymer-salt blend; extruding the polymer-salt blend under conditions suitable to form a hollow fiber comprising the polymer-salt blend; and leaching the hollow fiber comprising the polymer-salt blend in water under conditions suitable for the removal of salt to proceed to a sufficient extent.
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35-58. -58. (canceled)
Specification