Filters employing particulate porous polymers
AssigneeThe Dow Chemical Company
InventorsWalter L. Vaughn, Thomas J. McKeand, Jr.
Life of this patent
Estimating the term…
Abstract
Novel filters are prepared, and filtrations are performed, using porous fibers and filaments which are comprised of normally solid, thermoplastic, orientable, organic polymers which have reactive or reactable groups pendent from the polymer chain, said polymers being made using a process which involves reactions of said pendent groups while the polymer is in an oriented condition. One of the preferred polymers is a copolymer of ethylene/acrylic acid. Ionomers of the polymers can be used.
Claims7
A process for removing filterable, sorbable, or chemi-sorbable substances from a fluid, said process comprising bringing the fluid into contact with filter material and then removing the fluid from the filter material, leaving the said substances with the filter material,
- wherein the filter comprises composite configurations of particulate forms of at least one normally-solid, microporous, oriented olefin polymer having pendent, reactive or polar, side-groups along the polymer molecules, said side-groups being substantially reactable with a reagent at a temperature below that at which thermal stress-relaxation of the oriented molecules is substantially encountered.
A process of removing unfilterable cations, sorbable substances, or chemi-sorbable substances from a fluid, said process comprising bringing the fluid into well-mixed contact with particulate filterable material and then removing the fluid from the particulate filterable material, leaving the said cations, sorbable substances or chemi-sorbable substances with the filterable material,
- wherein the particulate filterable material comprises at least one normally-slid, microporous, oriented olefin polymer having pendent, reactive or polar, side-groups along the polymer molecules, said side-groups being substantially reactable with a reagent at a temperature below that at which thermal stress-relaxation of the oriented molecules is substantially encountered.
Dependencies are inferred from the claim text.