Formulations: In Cosmetic and Personal Care (De Gruyter Textbook) by Tharwat F. Tadros

Author:Tharwat F. Tadros [Tadros, Tharwat F.]
Language: eng
Format: azw3
Publisher: De Gruyter
Published: 2016-09-11T16:00:00+00:00

Many cosmetic emulsions behave as semi-solids with long t∗. They show only elastic response within the practical range of the instrument, i.e. G′ ≫ G′′ and they show a small dependence on frequency. Thus, the behaviour of many emulsions creams is similar to many elastic gels. This is not surprising, since in most cosmetic emulsion systems, the volume fraction of the disperse phase of most cosmetic emulsions is fairly high (usually > 0.5) and in many systems a polymeric thickener is added to the continuous phase for stabilization of the emulsion against creaming (or sedimentation) and to produce the right consistency for application.

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