Hydrogel capsules and process for preparing the same

A hydrogel capsule comprising a fragrance encapsulated in at least one polymerized acrylic or methacrylic acid, or ester thereof, wherein

• the hydrogel capsule has a mean diameter in the range of 1 to 100 μm;
• the fragrance is encapsulated in the hydrogel capsule during polymerization of at least one acrylic or methacrylic acid, or ester thereof contained in an oil phase;
• the oil phase contains:
• (i) the fragrance, (ii) the at least one acrylic or methacrylic acid, or ester thereof, and (iii) a water-insoluble oil solvent selected from the group consisting of an isoparaffinic fluid, a caprylic triglyceride, a capric triglyceride, a light mineral oil, a light mineral wax, a vegetable oil, a light vegetable wax, diethylphthalate, butylbenzoate, benzylbenzoate, an ester solvent, triacetin, a glycol-based water-insoluble solvent, and a combination thereof;
• the at least one acrylic or methacrylic acid, or ester thereof is a multifunctional acrylate or methacrylate;
• the multifunctional acrylate or methacrylate is further copolymerized with a monofunctional acrylate or methacrylate to form the shell of the hydrogel capsule;
• and
• the ratio between the monofunctional acrylate or methacrylate and the multifunctional acrylate or methacrylate is up to 8:92 wherein the hydrogel capsule has a fragrance intensity greater than a hydrogel capsule prepared from a ratio greater than 8:92.