| 摘要 |
The present invention relates to a process for the preparation of a suspension of capsules of core/shell type comprising the steps of mixing, at ambient temperature, an oily phase and polymers, at least one of which is an oligomer having a weight-average molecular weight of less than 10 000 and a hydroxyl number (NOH) of greater than or equal to 10 mg KOH/g, of homogenizing the oily phase and the polymers by heating, of dispersing the homogeneous mixture thus obtained in an aqueous phase, in order to obtain a direct preemulsion, the oily phase of which comprises the polymers, of subjecting the preemulsion thus obtained to shear forces appropriate for the reduction in the diameter of the particles of the dispersed mixture, of cooling the emulsion thus obtained to a temperature suitable for the coacervation of the said polymers and for the coating of drops of the said oily phase by the coacervates, and of cooling the suspension to a temperature suitable for the formation of the capsules by the precipitation and/or crystallization of the coacervates. The present invention also relates to the capsules thus obtained.
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