J & W Whewell offers phosphate ester based anionic surfactants exhibiting a wide range of properties. Most are available in free acid form that may be neutralised with a number of different bases. Neutralisation with alkali metal hydroxides increases the water solubility of phosphate esters while neutralisation with higher molecular weight amines may produce oil soluble products with good lubricating and corrosion inhibiting properties.
The emulsifying and dispersing properties of phosphate esters vary with the nature of the hydrophobe on which then are based, degree of ethoxylation and phosphation. They range from being soluble in paraffinic hydrocarbons to being soluble in water containing high levels of electrolytes. The products with highest water solubility act as hydrotropes to solubilise other surfactants in high concentrations of salts and alkalis.