| 主权项 |
1. A process to produce essential oils microcapsules suitable for use as disinfectants, pesticides, insect repellants, antiviral and/or antifungal agents, the process comprising the steps of:
(a) dissolving a di- or polyisocyanate into a volatile essential oil to form a non-aqueous mixture; (b) emulsifying the non-aqueous mixture in an aqueous solution comprising a di- or polyamine, and/or a di- or polyhydroxy compound and at least one non-basic emulsifier selected from the group consisting of low density polyvinyl alcohol, high density polyvinyl alcohol, Tween 20, Tween 40 and Tween 80 to effect encapsulation of the essential oil through interfacial polymerization, the interfacial polymerization carried out at a temperature of between 0° C.-30° C., wherein steps (a) and (b) form microcapsules comprising a polyurea and/or polyurethane shell encapsulating the essential oil droplets, wherein the microcapsules comprise 60 to 95% essential oil, and wherein the microcapsules after formation, are reacted with reactive amine or hydroxyl containing reagents which also contain anionic, cationic, amphoteric or hydrophilic groups which render the surface of the microcapsules anionic, cationic, amphoteric or non-charged hydrophilic. |
