Mixtures of organic ammonium salts as flow accelerators

A salt mixture comprising:

• a quaternary ammonium salt of the formula ( 1) ##STR16## the above right-hand structure being the anion, wherein
• R denotes a group of the formula ##STR17## R.sup.1 denotes C.sub.12 -C.sub.26 alkyl, C.sub.12 -C.sub.26 alkenyl, C.sub.12 -C.sub.26 fluoroalkyl, C.sub.12 -C.sub.26 -fluoralkenyl or a group of the formulae ##STR18## R.sup.2 and R.sup.3 denote C.sub.1 -C.sub.3 -alkyl, R.sup.4 denotes C.sub.1 -C.sub.3 -alkyl and, for the case where R.sup.1 =alkyl or alkenyl, also a group of the formula --(C.sub.2 H.sub.4 O).sub.z H,
• R.sub.f denotes C.sub.8 -C.sub.20 fluoroalkyl or C.sub.8 -C.sub.20 -fluoroalkenyl,
• R.sup.5 denotes hydrogen, methyl or ethyl,
• R.sup.6 denotes --COO.crclbar. or --SO.sub.3 .crclbar.,
• R.sup.7 denotes hydrogen or methyl,
• B denotes oxygen or sulfur,
• x denotes an integer from 2 to 6,
• y denotes 0, 1 or 2, and
• z denotes numbers from 1 to 4,
• and an alkali metal salt of an anion of the formula 2 ##STR19## wherein R.sup.8 denotes --COO.crclbar. or --SO.sub.3 .crclbar., R.sup.9 denotes hydrogen, hydroxyl, CO.sub.2, fluorine, chlorine, bromine or iodine and R.sup.10 denotes C.sub.1 -C.sub.5 -alkyl, C.sub.2 -C.sub.5 -alkenyl or C.sub.1 -C.sub.5 alkoxy, in a quantity of 30 to 70 mol %, based on the total amount of said anion.