Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1974-09-19
1977-07-26
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
210500M, 264 466, 264 85, 264269, B29C 2300, B29D 710, B29D 2704
Patent
active
040383512
ABSTRACT:
An open pore liquid purification apparatus containing semipermeable membranes, is made by: (1) placing a module, made of bonded, resin coated filler particles, having a plurality of spaced circular bores therethrough, in a stationary vertical position, (2) placing a viscous casting composition into each of the bores, the composition containing 10 parts polysulfone resin and 10-40 parts of an organic solvent, the solvent being effective to homogeneously disperse and partly dissolve the polysulfone, (3) gravity dropping a casting bob, having a circular cross-section at its widest point, down through each bore to form a continuous film of casting composition on the inside of each bore, and then (4) immediately exposing the film to a low humidity atmosphere, and (5) contacting the film with a suitable leaching liquid, to form a polysulfone ultrafiltration membrane on the inside of each module bore; the membrane being resistant to solvents and operable at a pH of about 1 to 12 and a temperature of about 5.degree. to 85.degree. C.
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Margerison et al., "An Introduction to Polymer Chemistry," Pergamon, N.Y., (1967) p. 101.
Walker et al., Principles of Chemical Engineering, McGraw-Hill, N.Y. (1937), pp. 586-593 & Humidity Chart.
Koenst, Jr. John W.
Mitchell Edward
Hoag Willard E.
Moran William Raymond
Union Carbide Corporation
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