Dynamic Properties of a Powder Bed Composed of Mica and Microspherical Poly (methyl methacrylate) Particles

Characterization of Cosmetic Dispersions Based on Friction Dynamics

“…Previously, there were studies on the frictional properties of cosmetic dispersions and their ingredients to demonstrate the effects of the types of powders and polymers, the type of formulation, and the applied amount on frictional properties. Kashimoto et al demonstrated that the addition of a small amount of spherical fine particles to a plate-like powder in particular reduced the frictional resistance to shear 1) . Onoda et al reported that a mixture of white pigment titanium phosphate with urea, sodium lactate, and glycerin had excellent moisturizing and lubricating properties 2) .…”

Characterization of Powder Cosmetics Based on Friction Dynamics

“…Friction is important during the application of eye shadows, blushes, and powder foundations when using a puff or a sponge. Some reports have investigated the effects of powders, oils, polymers, and application amounts on the frictional properties of powder cosmetics: Kashimoto showed that adding a small number of spherical particles to a plate-like powder specifically reduced the frictional shear resistance 1) . Enferad et al reported that a reduction in flowability was caused by the irregular shape, the wide size distribution, and the high cohesion force of the powder particles 2) .…”