Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ
Patent
1983-02-10
1986-06-10
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
21050036, 21050023, 264 453, 264 49, 2642095, 521 63, C08J 926
Patent
active
045942072
ABSTRACT:
Porous bodies, particularly membranes in the form of hollow filaments, are produced by heating a polymer above the upper critical temperature T.sub.c in a mixture of two compounds A and B, liquid and miscible at the dissolving temperature, whereby the employed mixture (polymer, compounds A and B) in liquid aggregate state displays a miscibility gap, the compound A is a solvent for the polymer and the compound B, which preferably is a non-solvent or a swelling agent for the polymer, raises the phase separation temperature of a solution composed of the polymer and compound A. After the dissociation, the components A and/or B if necessary are extracted. Through use of non-toxic substances such as e.g. edible oil as compound A and castor oil as compound B, bodies are obtained which are non-toxic and unobjectionable for use in medical areas and in the foods industry, among others.
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Josefiak Christoph
Wechs Friedbert
Akzo NV
Anderson Philip
Striker Michael J.
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