W/O/W emulsions

US5750124A · kind A · utility

Assignee

• BEIERSDORF AG · DE

Inventors

• Sven Gohla · Seevetal, DE
• Anja Müller · Bad Oldesloe, DE
• Jens Nielsen · Brønderslev, DK

Key dates

• Filing date: Jun 17, 1996
• Grant date: May 12, 1998
• Expiry date: Jun 17, 2016

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61Q19/00
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Multiple emulsions of the W/O/W type having a continuous external aqueous phase, an oily phase dispersed therein and a second (internal) aqueous phase dispersed in this oily phase, comprising PA1 (a) at least one emulsifier whose lipophilicity increases with increasing temperature and the hydrophilicity of which increases with decreasing temperature, the emulsifier or emulsifiers changing from an HLB value <10 to an HLB value >10 in the temperature range of 40.degree.-90.degree. C., the HLB value of the emulsifier or emulsifiers at room temperature being between 11 and 18, the emulsifier not being completely soluble in the oily phase when the oily phase is combined with the aqueous phase, PA1 (b) an oily phase, the base constituent(s) being physiologically tolerated oils, fats and waxes having a "required HLB value" (RHLB) of 10-20, and/or a polarity (determined in surface tension units), individually or in combination, of less than 30 mN/m, PA1 (c) an external and an internal aqueous phase, the aqueous phases comprising 0.1-5% by weight of organic and/or inorganic electrolytes with mono-, di- or trivalent cations, PA1 (e) optionally further auxiliaries and/or additives to stabiliz…