19 ABSTRACTThe present invention relates to new methacrylic acid-free alkali swellable thickener5 emulsions: this monomer was until then indispensable, which made manufacturers dependent on this raw material. These new emulsions contain a certain quantity of 2- acrylamido-2-methylpropane sulfonic acid (or AMPS, CAS No: 40623-75-4). They may also be made in the absence of a surfactant, which prevents the formation of foam, Finally, they are effective for thickening aqueous media, including media with a pH10 between 5 and 6, such as the skin.No Fig.
