C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/29
C08J 9/28 (2006.01) C08F 214/22 (2006.01) C08L 27/16 (2006.01)
Patent
CA 1170010
Porous Vinylidene Fluoride Polymer Membrane and Process for Its Preparation Abstract of the Disclosure Vinylidene fluoride polymer ultrafiltration membranes are prepared by casting a sheet of said polymer dissolved in a solution comprising a mixture of a specified solvent and a specified non-solvent, the solution containing from about 12 to about 35 weight percent of the polymer on a smooth substrate, evaporating a portion of the solvent from the sheet, immersing said sheet in a gelation liquid therefore, and optionally, stabilizing the gelled sheet by heat treatment thereof. A porous vinylidene fluoride polymer membrane having smooth, unwrinkled surfaces can be prepared in accordance with the above described process without restraining the membrane during the evaporation and gelation steps by utilizing triethyl phosphate as the solvent.
371778
Benzinger William D.
Robinson Donald N.
Atochem North America Inc.
Borden Ladner Gervais Llp
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