Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ
Patent
1997-07-08
1999-04-27
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
264148, 264203, 2642091, 26421114, 26421116, 264232, 264233, 264261, B29C 6720, D01D 524, D01D 5247
Patent
active
058978178
ABSTRACT:
Methods are disclosed for making semipermeable membranes from cellulose acetate and for making medical devices therefrom. In the process, a molten liquid comprising cellulose acetate (CA) is extruded to produce a membrane. The solvent and non-solvent are removed from the membrane to produce a semipermeable membrane having a water permeability. The semipermeable membrane is impregnated with a liquid consisting essentially of water to render the semipermeable membrane capable of being stored until time of use without undergoing a substantial loss in water permeability. The semipermeable membrane can be incorporated in a casing in order to produce a medical product, wherein the membrane is impregnated in the product.
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Radovich John M.
Rothberg Melvin
Washington George
Althin Medical, Inc.
Tentoni Leo B.
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