Acrylonitrile/​Methyl Methacrylate/​Vinylidene Chloride Copolymer

Also-called-like-this: Expancel microspheres

Details

Thermoplastic (a type of plastic that becomes moldable at higher temperatures and solidifies upon cooling) microspheres (tiny balls) that are generally used as lightweight fillers. As for cosmetics, we have found a patent from Living Proof that claimes a hair spray composition with our microsphere to "surprisingly increase the volume of hair".

Other than that, the L'Oreal group seems to like and use Acrylonitrile/Methyl Methacrylate/Vinylidene Chloride Copolymer as a hollow, gas-filled (probably filled with isobutane) microsphere as it improves the skin feel of aqueous gel formulas and makes them very comfortable and smooth.