METHOD FOR PREPARING MICROCAPSULES BY DOUBLE EMULSION
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United States of America Patent
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Feb 14, 2019
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Sep 16, 2016
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Sep 16, 2015
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Abstract
The present invention relates to a method for preparing solid microcapsules, comprising the steps of: a) adding under agitation a composition C1 comprising at least one active material to a cross-linkable liquid composition C2, wherein the active material is an additive to be used in the oil industry, composition C1 and composition C2 being immiscible with each other, so that a first emulsion is obtained, said first emulsion comprising droplets of composition C1 dispersed in composition C2, b) adding under agitation the first emulsion obtained in step a) to a liquid composition C3, composition C3 and composition C2 being immiscible with each other, so that a second emulsion is obtained, said second emulsion comprising droplets dispersed in composition C3, c) loading the second emulsion obtained in step b) in a mixer which applies a homogeneous controlled shear rate to said second emulsion, said shear rate being from 1 000 s−1 to 100 000 s−1, so that a third emulsion is obtained, said third emulsion comprising droplets dispersed in composition C3, and d) cross-linking the droplets obtained in step c), so that solid microcapsules dispersed in composition C3 are obtained.
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