Liquid purification or separation – Filter – Material
Reexamination Certificate
2011-04-05
2011-04-05
Menon, Krishnan S (Department: 1777)
Liquid purification or separation
Filter
Material
C210S500420, C210S500270, C427S246000
Reexamination Certificate
active
07918349
ABSTRACT:
Composite membranes that exhibit long-term resistance to biofouling comprise a porous support and a crosslinked polyamide discriminating layer having an external surface, the discriminating layer comprising a branched poly(alkylene oxide) (PAO) polymer attached to its external surface. The branched PAO polymer typically has the structure of a molecular comb or brush, and is made by polymerization of a PAO macromonomer of the following formula:in-line-formulae description="In-line Formulae" end="lead"?RO—[(CHR′)n—O]m—Vin-line-formulae description="In-line Formulae" end="tail"?in which R is hydrogen or a C1-20aliphatic or aromatic group, V is any group containing a polymerizable site, each R′ is independently hydrogen or a short chain alkyl group, n is an integer of 1-6, and m is an integer of 1 to about 200. The α end group can be either polymerized or copolymerized.
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Mickols William E.
Niu Qingshan Jason
Black Edward W.
Dow Global Technologies LLC
Menon Krishnan S
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