Method for preparing stiffened capsules

摘要

The present invention relates to a method for preparing capsules comprising a liquid core, a stiffened intermediate envelope and a gelled external envelope, comprising a step of forming a multi-component liquid drop, a gelification step and a stiffening step.;The present invention also relates to a method for preparing capsules comprising a liquid core and a stiffened envelope, comprising a step of forming a multi-component liquid drop, a gelification step, a stiffening step and a depolymerizing step.

主权项

1. A method for preparing capsules, each capsule comprising a liquid core and a stiffened intermediate envelope totally encapsulating at its periphery the liquid core, said method comprising the following steps of:
(A) forming a multi-component liquid drop comprising: (1) a liquid core, (2) a liquid intermediate envelope formed with an intermediate composition comprising at least one first reagent R1, totally encapsulating at its periphery the liquid core, and (3) a liquid external envelope formed with an external aqueous composition, different from the intermediate composition, said composition comprising at least one polyelectrolyte different from the first reagent R1 and at least one surfactant, totally encapsulating at its periphery the intermediate envelope, (B) gelling by immersion of said multi-component liquid drop in a gelling solution containing a reagent able to gel the polyelectrolyte of the liquid external envelope, in order to obtain a gelled capsule comprising a gelled external envelope, (C) stiffening the first reagent R1 of the liquid intermediate envelope of the gelled capsule comprising a gelled external envelope obtained in (B), in order to obtain a gelled and stiffened capsule comprising a stiffened intermediate envelope, and (D) recovering said gelled and stiffened capsules.