Composite Microcapsule Shells for Stable Perfume Release

The patent applies composite materials by combining coacervate (from plant proteins like gelatin or casein) with synthetic or natural polymers (such as polyurea, polyurethane, or cellulose derivatives) to form a hybrid shell structure. This composite shell leverages the biodegradability and eco-friendliness of coacervate while gaining the chemical resistance and mechanical strength from the polymer component, thereby maintaining olfactive performance while improving stability in aggressive consumer product bases.

The patent employs parameter changes by modifying the shell composition to include polymers with specific chemical properties (such as polyurea or polyurethane) that exhibit resistance to surfactant degradation. The cross-linking density, polymer molecular weight, and coacervate-to-polymer ratio are adjusted to optimize the shell's resistance to high levels of surfactant detergents, enabling the microcapsules to maintain integrity even in high-performance cleaning products.

The patent merges coacervate (made from plant-based proteins such as gelatin, casein, or soy protein) with structurally robust polymers (like polyurea, polyurethane, or chitosan) to create a composite shell. The coacervate provides the eco-friendly, biodegradable characteristic, while the polymer matrix contributes mechanical strength and resistance to physical forces such as crushing. This synergistic combination achieves both environmental sustainability and adequate mechanical stability for consumer product applications.