Composite membrane
AssigneeDow Global Technologies LLC
InventorsDavid J. Moll, H. C. Silvis
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Abstract
A method of making a composite membrane comprising the steps of forming a discriminating layer upon a surface of a porous support by sequentially applying immiscible coating solutions upon the support, wherein one coating solution comprises a crosslinking agent and another coating solution comprises a block copolymer, and the block copolymer comprises sacrificial segments and durable segments including reactive pendent groups which react with the crosslinking agent and form a crosslinked matrix comprising micro-domains of the sacrificial segments, and removing at least a portion of the sacrificial segments to yield pores.
Claims7
A method of making a composite membrane comprising the steps of forming a discriminating layer having a thickness of less than 20 μm upon a surface of a porous support by sequentially applying immiscible coating solutions upon the support, wherein:
- i) one coating solution comprises a crosslinking agent,
- ii) one coating solution comprises a block copolymer, wherein the block copolymer comprises durable segments that include reactive pendent groups and sacrificial segments and wherein the weight ratio of durable to sacrificial segments is from 1:6 to 2:1,
- iii) the reactive pendent groups react with the crosslinking agent to form a crosslinked matrix comprising micro-domains of the sacrificial segments, and
- wherein said method comprises etching at least a portion of the sacrificial segments to yield pores having a mean flow pore size of from 0.1 to 0.001 μm.
Dependencies are inferred from the claim text.