Active ingredient microparticles

The present invention pertains to polymer-coated microparticles comprising at least one HASE acrylic copolymer, at least one solid-liquid phase change materials having a phase transition temperature varying from 20 to 90°C and at least one active ingredient. More particularly, the microparticles comprise at least one HASE acrylic copolymer comprising at least one anionic monomer having a polymerisable vinyl function and a carboxyl moiety, at least one non-ionic hydrophobic monomer having a polymerisable vinyl function, and at least one associative oxyalkylated macromonomer having a polymerisable vinyl function and a hydrophobic hydrocarbon chain.