Method for the casting of ultrathin polymer membranes
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United States of America Patent
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-
Jul 21, 1981
Issued Date -
N/A
app pub date -
Dec 26, 1974
filing date -
May 2, 1973
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method is described for the solvent casting of ultrathin non-porous membranes having surface areas of greater than one square foot. Film thicknesses of less than 200 Angstroms are routinely obtained, because the solidified film remains substantially free of tensile stress during the formation and removal thereof from the liquid casting substrate. The casting solution used comprises polymer dissolved in a solvent system and is characterized by being able to spontaneously spread over the surface of the liquid casting substrate. The casting solution is deposited in a narrow, longitudinally-extending defined region at the surface of the casting substrate; the surface area and perimeter of the defined region are enlarged over the surface of the casting substrate in a manner whereby only casting solution is moved relative to the casting substrate and, once desolvated, the polymer film formed remains stationary relative to the casting substrate and substantially free of tensile stress.
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