Multi-component composite membrane and method for preparing the same
First Claim
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1. A multi-component composite membrane comprising active layers and support layers, wherein a support layer is located between active layers, wherein the active layers have pores having a pore size and a pore distribution, and wherein the support layer has pores having a different pore size and a different pore distribution.
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Abstract
The present invention relates to a multi-component composite separate membrane and a method for preparing the same, and to a multi-component composite membrane comprising a support layer and active layers, wherein the support layer is located between the active layers.
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Citations
47 Claims
- 1. A multi-component composite membrane comprising active layers and support layers, wherein a support layer is located between active layers, wherein the active layers have pores having a pore size and a pore distribution, and wherein the support layer has pores having a different pore size and a different pore distribution.
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17. A preparation method of a multi-component composite membrane comprising steps of:
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a) preparing a precursor film by injection of a polymer, which is used, for a support layer into an extruder;
b) annealing the precursor film at a temperature less than a melting point of the polymer;
c) coating both surfaces of the precursor film with a polymer solution, which is used for an active layer;
d) drying the coated precursor film;
e) low temperature-stretching the dried precursor film at a temperature less than room temperature;
f) high temperature-stretching the low temperature-stretched precursor film at a temperature less than the melting point of the polymer; and
g) heat-setting the high temperature-stretched precursor film under tension at a temperature less than the melting point of the polymer. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30, 37, 38, 41, 42, 43)
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29. (Canceled).
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33. A preparation method of a multi-component composite membrane comprising steps of:
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a) annealing a precursor film comprising a polymer at a temperature less than a melting point of the polymer;
b) coating both surfaces of the precursor film with a polymer solution, which is used for an active layer;
c) drying the coated precursor film;
d) low temperature-stretching the dried precursor film at a temperature less than room temperature;
e) high temperature-stretching the low temperature-stretched precursor film at a temperature less than the melting point of the polymer; and
f) heat-setting the high temperature-stretched precursor film under tension at a temperature less than the melting point of the polymer. - View Dependent Claims (34, 35, 36, 39, 40, 44, 45, 46)
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Specification