| abstract |
The present invention relates to a novel alkali swellable thickener emulsion free of methacrylic acid, which until now this monomer was essential and made the manufacturer dependent on this raw material. The new emulsion contains a certain amount of 2-acrylamido-2-methylpropane sulfonic acid (or AMPS, CAS No .: 40623-75-4). The emulsion can also be prepared in the absence of a surfactant, thereby preventing the formation of bubbles. Finally, the emulsion is effective for thickening aqueous media, including media having a pH of 5-6, such as skin. |