Latices from emulsified hydrocarbon rubber solutions by membrane separation
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United States of America Patent
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Jun 13, 2000
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N/A
app pub date -
Aug 20, 1998
filing date -
Aug 20, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Rubbery polymers in hydrocarbon solutions are emulsified in aqueous liquids and converted to latices by partitioning the emulsion through a membrane of selective permeability to the hydrocarbon solvent relative to both water and the polymer, thereby removing the hydrocarbon solvent from the emulsion. The foaming that is often associated with removing hydrocarbon solvent from aqueous emulsions by conventional means is thus avoided. Membrane partitioning mechanisms that are useful for this application include those involving both nonporous and microporous membranes, those passing the solvent both as a liquid and as a gas, those drawing off the permeate as both a liquid and a gas, and various combinations of these methods.
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