VISIOMER® MPEG methacrylates are often used as nonionic reactive emulsifiers. When used in emulsion polymerization, a large fraction of the emulsifier molecules become irreversibly bound to the emulsion polymer chains and droplets. This can both improve latex stability and reduce foaming.
A dispersant is either a non-surface active polymer or a surface-active substance added to a suspension, usually a colloid, to improve particle separation and prevent settling or clumping. Dispersants normally consist of one or more emulsifiers. Polyacrylates represent one type of polymer dispersants. Monomers commonly used for these dispersants include VISIOMER® DMAPMA, MADAME™, TMAEMC, MAPTAC and MPEG methacrylates. Polymer dispersants are widely used in many products, for example in adhesive dispersions emulsions/dispersions, detergents, photographic solutions as well as in agriculture, cosmetics and pharmaceuticals. You will also find them in cleaning and polishing products.
Acrylic thickeners are commonly produced by emulsion polymerization. One of the most important monomers for this kind of thickeners is Methacrylic acids. Usually, crosslinkers like VISIOMER® AMA or EGDMA are added in the formulation in a low concentration in order to increase the molecular weight of the produced polymer. Another type of thickener, also called associative thickener, is based on hydrophobically modified polymers that combine high thickening efficiency with a less marked shear-thinning viscosity profile. Here, viscosity/shear can be controlled by varying the length of the polymer’s hydrophobic groups and molecular weight. Evonik’s VISIOMER® C18PEG 1105 MA W was developed specifically with this purpose in mind and has become an industry reference.