onic surfactants with an HLB of greater than 8 at 25?? C., such as those mentioned above, such as:saccharide esters and ethers, such as sucrose stearate, sucrose cocoate and sorbitan stearate, and mixtures thereof, for instance Arlatone 21210 sold by the company ICI;fatty acid esters (especially of a C8-C24 and preferably C16-C22 acid) of polyols, especially of glycerol or of sorbitol, such as gly