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US 7,067,058 B2Granted
Hydrophilic membrane and process for making the same
Assignee3M Innovative Properties Company
InventorsEshan B. Yeh, Michael S. Mezhirov
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Abstract
A process for imparting hydrophilic properties to a polymeric membrane by exposing the membrane to an acrylate monomer containing hydrophilic segments, such as ethylene oxide, and a hydrophilic functional group, a diacrylate monomer containing hydrophilic functional groups, and an initiator for facilitating crosslinking and polymerization reactions.
Claims31
A process for making a hydrophilic membrane, comprising the acts of:
- providing a polymeric micronorous membrane;
- providing an monofunctional acrylate monomer nEGMA, wherein nEGMA
- comprises OH2═CCH3—C(O)—(O—CH2—CH2)n+1—OH and where n is a variable of greater magnitude than one;
- providing a diacrylate monomer including hydrophilic units;
- providing an initiator for facilitating polymerization and crosslinking reactions of the acrylate and diacrylate monomers;
- and
- exposing the polymeric membrane to the acrylate and diacrylate monomers in the presence of the initiator to actuate polymerization and crosslinking of the acrylate and diacrylate monomers.
4 more elements
A substantially thermally stable hydrophilic polymeric membrane comprising:
- a phase inverted microporous substrate;
- a crosslinked surface coating including the monofunctional acrylate monomer nEGMA, wherein nEGMA comprises OH2═CCH3—C(O)—(O—CH2—CH2)n+1—OH and where n is a variable of greater magnitude than one;
- and
- a difunctional diacrylate monomer having hydrophilic functional groups.
1 more element
Dependencies are inferred from the claim text.