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US 5,635,060 AGranted
Composite membranes for solid phase extractions and reactions
AssigneeMinnesota Mining and Manufacturing Company
InventorsDonald F. Hagen, Paul E. Hansen, Craig G. Markell
Life of this patent
Estimating the term…
Abstract
A solid phase extraction or chromatographic medium comprises a porous nonwoven fibrous matrix comprising at least one of polytetrafluoroethylene and blown microfibers, and sorptive or reactive hydrophobic siliceous molecular sieve particulates enmeshed in said matrix, the ratio of molecular sieves to matrix being in the range of 40:1 to 1:40.
Claims19
A solid phase extraction or chromatographic medium comprising
- (a) a porous nonwoven fibrous matrix comprising fibrillated polytetrafluoroethylene, and
- (b) sorptive or reactive hydrophobic siliceous molecular sieve particulates having pore diameters in the range of about 5.5 to about 6.2 A enmeshed in said matrix, the ratio of molecular sieves to matrix being in the range of 40:1 to 1:40,
- said medium having an essentially homogeneous composition and essentially uniform porosity and being useful to remove organics from aqueous fluids, which aqueous fluids pass through or by said medium.
A solid phase extraction or chromatographic medium comprising
- (a) a porous nonwoven fibrous matrix comprising polytetrafluoroethylene, and
- (b) sorptive or reactive hydrophobic siliceous molecular sieve particulates enmeshed in said matrix, said molecular sieve particulates being impenetrable by water molecule clusters,
- said medium being a sheet material of essentially homogeneous composition and essentially uniform porosity and being useful to remove organics from aqueous fluids, which aqueous fluids pass through or by said medium.
Dependencies are inferred from the claim text.