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AssigneeInstitut Francais du Petrole
InventorsJean-Francois Argillier, Maria-Lidice Soto-Portas, Nathalie Zydowicz, Francoise Mechin, Angele Chomard
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The present invention relates to a process of obtaining microcapsules, comprising mainly the following stages: preparing a scarcely water-soluble organic phase containing a determined amount of acid chlorides, forming an emulsion of said organic phase in an aqueous phase, adding to the aqueous emulsion an amount of at least one polyoxyalkylene polyamine, reacting the monomers containing the amine and acid chloride functions so as to form a polyamide membrane around the emulsified organic phase, recovering the microcapsules obtained. The present invention also relates to a microcapsule.
1) A process of obtaining microcapsules, mainly comprising the following stages:
4) A process as claimed in any one of the previous claims, wherein the molar ratio R of the amine functions to the chloride functions ranges between 1 and 30, preferably between 4 and 10.
5) A process as claimed in any one of the previous claims, wherein said polyamine is a diamine of general formula:
8) A process as claimed in any one of the previous claims, wherein the number of amine functions is furthermore provided by adding at least diethylenetriamine.
9) A process as claimed in any one of the previous claims, wherein said acid chlorides are selected from among sebacoyl chloride, trimesoyl chloride or mixtures thereof.
11) A process as claimed in any one of the previous claims, wherein said amount of acid chloride ranges between 0.3 and 4 moles of COCl per millilitre of organic phase, preferably between 1 and 2 moles per millilitre.
12) A microcapsule containing a scarcely water-soluble organic phase embedded in a polyamide membrane resulting from the reaction between at least one polyoxyalkylene polyamine and acid chlorides, characterized in that said polyamine comprises at least one of the following amines:
Dependencies are inferred from the claim text.