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
1974-12-26
1981-07-21
Lowe, James B.
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, B29D 702
Patent
active
042798558
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.
REFERENCES:
patent: 1777308 (1930-10-01), Holweck
patent: 1945933 (1934-02-01), Chilowsky et al.
patent: 2607081 (1952-08-01), Taylor
patent: 3580841 (1971-05-01), Cadotte et al.
patent: 3679784 (1972-07-01), Rosenberg
patent: 3767737 (1973-10-01), Lundstrom
Pate & Yaffe, "Techniques for Fabrication--of Very Thin Films", Can. J, Chem., 33, 15(1955), pp. 15-23.
Davis Jr. James C.
General Electric Company
Lowe James B.
MaLossi Leo I.
LandOfFree
Method for the casting of ultrathin polymer membranes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for the casting of ultrathin polymer membranes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the casting of ultrathin polymer membranes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2433028