Einfluss von Zusammensetzung und Phasenverhältnis auf die Konsistenz von Cremes

Determination of viscosity of newtonian fluids and pseudoplastics is optimal applying viscosimeter cylinder/beaker-systems as defined in DIN 53019-80 and ISO 3219. For newtonian fluids Brookfield LV and RV spindles can be used with minor limitations. for pseudoplastics, however, correction factors must be considered similar to the procedure established for T-bar spindles. For plastic and particularly rheotropic systems Brookfield T-bar spindles give reproducible results only in context with a defined method of performance. Such data is of practical use for quality control but must not be used as an absolute physical measure. Consistency of o/w emulsiongels containing fluid lipids is almost exclusively controlled by the degree of thickening of outer phase. Transition from lotion to emulsiongel is fluent. Thickening of inner phase with non-polar solid paraffin yields in moderate rise of consistency with o. In contradiction use of polar fatty alcohols produces high viscosity creames built by a system of viscoclastic solids. For w/o-emulsions with o ≤ 0.55 viscosity is obtained via thickening of outer phase and with o ≥ 0.6...0.93(!) by means of high proportion of inner phase. In the transition state between o/w and w/o systems stable Winsor-Type-III-creames, that are w+o/microemulsions, were formulated.