Porous polymer fiber filters
AssigneeThe Dow Chemical Company
InventorsWalter L. Vaughn, Milton S. Wing
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Abstract
Novel microporous fibers and filaments are prepared from normally solid, thermoplastic, orientable, organic polymers which have reactive or reactable groups pendent from the polymer chain, employing 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.
Claims5
A filter material comprising fibers or filaments, wherein said fibers or filaments comprise an olefin polymer extruded in elongate form and oriented to a dimensionally stable form at a temperature below that at which stress relaxation can occur, wherein said polymer having pendant reactive or polar sidegroups, wherein said olefinic polymer does not contain filler, and wherein the fibers or filaments have been swollen in a chemical reactant which reacts with said side groups to yield microporosity.
Dependencies are inferred from the claim text.