title: Mechanism of oil-in-water emulsification using a water-soluble amphiphilic polymer and lipophilic surfactant.
abstract: A new O/W (oil-in-water) emulsification system was developed using the amphiphilic polymer HHM-HEC (hydrophobically-hydrophilically modified hydroxyethylcellulose) and a lipophilic surfactant. HHM-HEC was used as a thickener and polymeric surfactant, and the addition of small quantities of various types of nonionic lipophilic surfactant (hydrophilic-lipophilic balance <5) decreased the droplet size of several types of oil due to a lowering of the tension at the water/oil interface. The oil droplets were held by the strong network structure of the aqueous HHM-HEC solution, preserving the O/W phase without inversion. These stable O/W emulsions were prepared without the addition of hydrophilic surfactants and thus show improved water repellency.
authors.affiliation: Kao Corporation, Tokyo Research Lab, 2-1-3 Bunka, Sumidaku, Tokyo 131-8501, Japan. akiyama.eri@kao.co.jp
authors.forename: Eri
authors.initials: E
authors.lastname: Akiyama
authors.forename: Akio
authors.initials: A
authors.lastname: Kashimoto
authors.forename: Hajime
authors.initials: H
authors.lastname: Hotta
authors.forename: Tomohito
authors.initials: T
authors.lastname: Kitsuki