Aqueous emulsions containing ethylene-vinyl acetate copolymers, preparation process thereof and their use as anti-gelling additives of crude oils
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United States of America Patent
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Sep 28, 2021
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Sep 17, 2020
app pub date -
Dec 2, 2016
filing date -
Dec 3, 2015
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Abstract
The present invention relates to an aqueous emulsion comprising: a) from 50% to 60% of an organic phase dispersed in an aqueous phase, said organic phase containing a mixture including from 24% to 30%, calculated with respect to the final emulsion, of ethylene-vinyl acetate copolymers and/or polyalkyl(meth)acrylates, indicated in the present description as polymeric component, and a high-boiling organic solvent, or a mixture of said solvents; b) a primary emulsifier at a concentration higher or equal to 0.1% and lower than or equal to 3% by weight, calculated with respect to the final emulsion; c) from 37% to 47% of an aqueous phase; wherein the ratio between said polymer component and said organic solvent in the final aqueous emulsion is at least 1/1 and where the organic solvent and any polymer of the polymeric component have a Hildebrand solubility parameter δ such that, the difference (δsolvent_δpolymer) is lower than 2 in absolute value for any polymer of the polymeric component.
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