Process for the preparation of an aqueous emulsion of a midblock sulfonated block copolymer
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United States of America Patent
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Jun 5, 2018
Issued Date -
Jan 26, 2017
app pub date -
Apr 1, 2015
filing date -
Apr 2, 2014
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Abstract
The present invention concerns aqueous emulsions and a process for preparing aqueous emulsions of a midblock sulfonated styrenic block copolymer comprising at least two non-sulfonated polymer end-blocks A and at least one sulfonated block B, comprising the steps of providing a cement of a midblock sulfonated styrenic block copolymer in the apolar solvent, mixing the cement with a co-solvent to form a mixture, emulsifying the mixture in the absence of a surfactant with water to produce an emulsion, and removing the hydrocarbon solvent and any optional co-solvent from the emulsion to produce the aqueous emulsion. The resulting emulsion of the midblock sulfonated styrenic block copolymer has relatively small particle diameters.
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