New naphthalimides, toners containing these and the use of the new naphthalimides as additives for toners

Naphthalimides of the formula (I) ##STR5## in which R represents C.sub.1 - to C.sub.22 -alkyl,

• R.sup.1 and R.sup.2 independently of one another in each case represent C.sub.1 - to C.sub.4 -alkyl, or R.sup.1 and R.sup.2, together with the nitrogen atom in between, form a pyrrolidine, piperidine or morpholine ring,
• n represents 2 or 3 and
• X.sup..crclbar. represent on equivalent of a benzoate or naphthoate, which is optionally substituted by chlorine, bromine, methyl, methoxy, hydroxyl, cyano and/or hydroxycarbonyl,
• of a benzenesulphonate which is substituted by amino or nitro,
• of a naphthalensesulphonate which is optionally substituted by amino or a sulphonic acid group, or
• of a fluorine-substituted anion of a C.sub.4 - to C.sub.18 -alkanecarboxylic or -alkanesulphonic acid wherein two to three identical or different substituents of those mentioned for benzoate, naphthoate, benzene sulphonate and naphthenesulphonate are present simultaneously.