Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1996-04-08
1998-11-17
McCamish, Marion E.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
4283197, 4283199, 428517, 428521, 521 55, 521134, 521905, B32B 518, B32B 2732
Patent
active
058373659
ABSTRACT:
Polypropylene (PP) membranes having a hydrophilic surface have been prepared by extracting a fugitive hydrophilic pore-forming agent from a gelled film prepared by evaporating the solvent from a homogeneous solution of isotactic polypropylene, functionalized polypropylene an the fugitive agent in a solvent, such as xylene. Most of the functional groups, such as --OH, --NH.sub.2 and --COOH, in the functionalized polypropylene are located on the surfaces of the membrane, including pore surfaces. The resulting membranes, especially membranes having an asymmetric structure, are useful for ultrafiltration, dialysis and/or microfiltration.
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G. Ruggeri, et al., "Some Aspects of Polypropylene Functionalization By Free Radical Reactions", Eur. Polym. J. vol. 19, No. 10/11, pp. 863-866, 1983.
Chung et al., "Synthesis of Functionalized Polypropylene", Reprinted from Macromolecules, vol. 24, pp. 970-972,1991.
Chung et al., "Kinetic Aspects of the Copolymerization between .alpha.-Olefins and Borane Monomer in Ziegler-Natta Catalyst", Reprinted from Macromolecules, 1993,26 pp. 3019-3025.
Copenheaver Blaine R.
McCamish Marion E.
Monahan Thomas J.
The Penn State Research Foundation
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