Sythetic Procedure and Physical Properties of Microcapsules Containing Cosmetic Oils

• Published in: Journal of Society of Cosmetic Chemists of Japan Vol. 22; no. 2; pp. 73 - 79
• Main Authors: Nagai, Masayoshi, Horino, Masaakira, Takasuka, Yutaka, Sakamoto, Munehiro, Iyanagi, Hirokazu, Andou, Ikuko, Fujino, Hiroshi, Kida, Sueo, Morimoto, Yoshifumi, Tanaka, Kouji
• Format: Journal Article
• Language: English
• Published: The Society of Cosmetic Chemists of Japan 1988
• ISSN: 0387-5253; 1884-4146
• DOI: 10.5107/sccj.22.73

The method of microencapsulation of cosmetic oils was studied. As the wall material, poly-acrylic esters, polymethacrylic esters and polyvinyl acetate were chosen. Among the investigated method of encapsulation, most suitable one was the in situ polymeri-zation directly on the surface of nucleous oil particles which are dispersed by using synthetic clay as dispersing agent. With this method, hydrocarbons and silicone oils were encapsulated easily, but each one of fatty acid, long chain alcohol, viscous oil, and caster oil was not encapsulated singly. Fragility of capsule wall against force of rubbing on the skin depended mainly on the content of encapsulated nucleous oil. The microcapsule of liquid paraffine with capsule content of 75% by weight was not broken even when it was compressed up to 50kg/cm2 pressure. However same microcapsule was very fragile against shearing force. When the microcapsule was put between two slide glass and slide glass were slipped each other under virtical pressure of 10 to 40g/cm2, it was broken entirely. The microcapsule was durable against processing forces such as stirring, for example 10000rpm, 10 minutes. There was no leakage of nucleous oil after microcapsule was kept at 80°C for 5 hours in aqueous solution of sodium lauryl sulfate. Neither swelling of capsule wall nor leakage of nuc-leous oil took place after microcapsule was kept in the aqueous solution of typical surfactant for 2 months.