Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – By casting on a liquid surface
Patent
1978-10-10
1980-03-11
Lusignan, Michael R.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
By casting on a liquid surface
264216, 55158, 427387, B29C 500, B29D 702
Patent
active
041928423
ABSTRACT:
An improved method is described for solvent casting ultrathin non-porous methylpentene polymer films. The casting solution comprises methylpentene polymer or a mixture thereof with organopolysiloxane-polycarbonate copolymer dissolved in a solvent system and is characterized by being able to spontaneously spread over the surface of the liquid casting substrate. In a preferred embodiment, large-area films less than 200 Angstroms in thickness may be repeatedly formed. The solidified films remain relatively free of tensile stress during formation. 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 the casting solution is moved relative to the casting substrate and, after desolvation, the polymer film formed remains stationary relative to the casting substrate and relatively free of tensile stress. The films are useful as semipermeable membranes for selectively removing oxygen gas from mixtures thereof with nitrogen gas.
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Pate, B. D. et al., Very Thin Film Article, v. 33, 1955.
Manatt, Scott A., FAA Study, Jun., 1974.
Methylpentene Polymers, Oct., 1976, Japan.
Chemical Resistance, Japan.
Browall Warella R.
Kimura Shiro G.
Lavigne Raymond G.
Cohen Joseph T.
General Electric Company
Jackson Richard G.
Lusignan Michael R.
Webb II Paul R.
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