Solid phase extraction membrane
Assignee3M Innovative Properties Company
InventorsKurt C. Carlson, Roger L. Langer
Life of this patent
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Abstract
A wet-laid, porous solid phase extraction sheet material that contains both active particles and binder and that possesses excellent wet strength is described. The binder is present in a relatively small amount while the particles are present in a relatively large amount. The sheet material is sufficiently strong and flexible so as to be pleatable so that, for example, it can be used in a cartridge device.
Claims20
A solid phase extraction sheet for removing one or more chemical species dissolved or entrained in a fluid, said sheet comprising a mixture of:
- a) a porous polymeric pulp comprising fibers, said polymeric pulp being selected from the group consisting of aramid, polyethylene, and polypropylene fibers;
- b) from about 3 to about 7 weight percent of a polymeric hydrocarbon binder selected from the group consisting of natural rubber, neoprene, acrylate resins, polyvinyl acetate, and styrene-butadiene copolymer;
- and
- c) particles entrapped in said pulp, some of said particles exhibiting at least one of reactive and sorptive properties toward said chemical species, said particles being present in an amount such that the weight ratio of particles to binder is at least 13:1,
- said sheet being produced by a wet-laid processs.
A solid phase extraction sheet for removing one or more chemical species dissolved or entrained in a fluid, said sheet comprising a mixture of:
- a) a porous polymeric pulp comprising fibers, said polymeric pulp being selected from the group consisting of aramid, polyethylene, and polypropylene fibers;
- b) from about 3 to about 7 weight percent of a polymeric hydrocarbon binder selected from the group consisting of natural rubber, neoprene, acrylate resins, polyvinyl acetate, and styrene-butadiene copolymer;
- and
- c) particles entrapped in said pulp, some of said particles exhibiting at least one of reactive and sorptive properties toward said chemical species, said particles being present in an amount such that the weight ratio of particles to binder is at least 13:1;
- said sheet being produced by a wet-laid process, and said sheet being sufficiently stable to radiation to permit removal of radioactive isotopes from a fluid.
Dependencies are inferred from the claim text.