Active agent microparticles

Polymeric-enveloped microparticles, comprising:

• an acrylic copolymer of the HASE type comprising:
• an anionic monomer with a polymerizable vinyl function and a carboxyl group;
• a non-ionic hydrophobic monomer with a polymerizable vinyl function;
• and
• an alkoxylated associative macromonomer with a polymerizable vinyl group and a hydrophobic hydrocarbon chain
• a solid-liquid phase change material with a phase transition temperature ranging from 20 to 90° C.;
• and
• an active agent.

A process for the preparation of an aqueous dispersion of polymeric-enveloped microparticles, comprising:

• a) preparation of an aqueous solution comprising:
• a HASE type acrylic copolymer solubilized in said aqueous solution via a base;
• at least one active agent;
• and
• at least one solid-liquid phase change material, the solid-liquid phase change material being present in, or having been introduced into the aqueous solution at a temperature greater than its phase transition temperature;
• and
• b) coacervation of the HASE type acrylic polymer to provide said aqueous dispersion of polymeric-enveloped microparticles.

A process for the preparation of an aqueous dispersion of polymeric-enveloped microparticles, comprising coacervation of a HASE type acrylic polymer in an aqueous solution comprising:

• the HASE type acrylic copolymer solubilized in said aqueous solution via a base;
• at least one active agent;
• and
• at least one solid-liquid phase change material, the solid-liquid phase change material being present in, or having been introduced into the aqueous solution at a temperature greater than its phase transition temperature
• to provide said aqueous dispersion of polymeric-enveloped microparticles.