5. Glossary
Emulsifier; Emulsify
A molecule with a hydrophilic part and a hydrophobic part that adsorbs at the water-oil interface and lowers the interfacial tension. Synonyms are "surfactant," "surface-active agent," and "detergent."
Coalescence; Coalescence
A phenomenon whereby several droplets merge into a single droplet when they come into contact with each other.
Log P:
Decimal logarithm of the partition coefficient between an organic phase of n-octanol and an aqueous phase. The partition coefficient P is the ratio of concentrations in the organic and aqueous phases. It is used as a descriptor of the hydrophilic/hydrophobic nature of a compound, even when the oil phase is not composed of n-octanol. A large log P indicates a highly hydrophobic molecule.
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Bibliography
Regulations
Regulation (EC) No. 1223/2009 of the European Parliament and of the Council of November 30, 2009 on cosmetic products (Cosmetics Regulation –, applicable as of July 11, 2013) https://eur-lex.europa.eu/ accessed on February 2, 2023.
Patents
Two-phase liquid cosmetic composition. FR2208642, Shiseido (1972).
Water-in-oil emulsion without surfactant. FR2720644, L'Oréal (1994).
Emulsifier-free finely dispersed systems of the oil-in-water and water-in-oil type. DE19842744, Beiersdorf AG (1998).
Cosmetic deodorants. DE4009347, Beiersdorf AG (1990).
Aqueous cosmetic or pharmaceutical...
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