Stock material or miscellaneous articles – Structurally defined web or sheet – Physical dimension specified
Patent
1977-07-21
1979-01-02
Ansher, Harold
Stock material or miscellaneous articles
Structurally defined web or sheet
Physical dimension specified
55158, 260824R, 260827, 428412, 428447, 428516, 428523, B01D 5322, B01D 3916
Patent
active
041328248
ABSTRACT:
An improved method is described for solvent casting ultrathin non-porous methylpentene polymer films. The casting solution comprises methylpentene polymer of 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.
REFERENCES:
patent: 3573334 (1971-03-01), Wheeler
patent: 3580841 (1971-05-01), Cadotte et al.
patent: 3767737 (1973-10-01), Lundstrom
patent: 3899309 (1975-08-01), Hoehn
patent: 3994988 (1976-11-01), Laurin
patent: 4028483 (1977-06-01), Bond et al.
patent: 4048129 (1977-09-01), Voight
Manatt, Feasability Study etc., F.AA. Report, 6-1974, Cat. No. AD-784950, NTIS.
Browall Warella R.
Kimura Shiro G.
Lavigne Raymond G.
Ansher Harold
Cohen Joseph T.
General Electric Company
Jackson Richard G.
MaLossi Leo I.
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