Abstract: The present invention relates to the use of salt-like structured silicates, in which the cation is NH4+, H3O+, an alkali metal, alkaline earth metal, earth metal or transition metal ion or a low molecular weight organic cation or a combination thereof and the anion is an island, cyclic, group, chain, ribbon, laminar or matrix silicate or a combination thereof as charge control agents in electrophotographic toners and developers, in powder coatings, electret materials and in electrostatic separation processes.

Abstract: The use of an azo pigment of the formula (1) ##STR1## as a colorant in electrophotographic toners, electrophotographic developers, powders and powder coatings, and electret materials, wherein said azo pigment is prepared in the presence of 20 to 50% by weight of an auxiliary selected from the group consisting of a rosin, a salt of a rosin, an abietic acid, and a salt of an abietic acid, wherein said weight is based on the overall weight of the azo pigment including said auxiliary, and wherein the azo pigment has a specific surface area of more than 70 m.sup.2 /g and the azo pigment particles comprising the azo pigment have a length-to-width ratio of on average less than 2.8:1 and a mean particle size d.sub.50 of less than 130 nm.

Abstract: Cyclosaccharide-boron complexes consisting of 1 to 4 cyclodextrin units and one borate radical of the formula (I): ##STR1## have good charge control properties and lend themselves excellently to dispersion in toner, powder coating and electret binders.

Abstract: Azo pigment of the formula (1) ##STR1## which has a specific surface area of the pigment powder of more than 45 m.sup.2 /g.The azo pigment is particularly suitable as colorant in electrophotographic toners and developers, and in powder coatings and electret materials.

Abstract: Inclusion compounds consisting of a host compound, which is a cyclically linked polysaccharide having 3 to 100 monomeric saccharide units and forming a cavity in its molecular framework, and of one or more chemical compounds which are included in this cavity as guest compound(s), are used as charge control agents and charging improvers in electrophotographic toners and developers, in triboelectrically or electrokinetically sprayable powders and powder coatings and in electret materials.

Abstract: Tetraphenylborates are obtained in an industrially advantageous grade by spray drying an organic, aqueous or organic-aqueous extract of the tetraphenylborates obtainable in the tetraphenylborates synthesis. It is advantageous to treat the specified extract prior to spray drying with pH-controlling auxiliaries and adsorbents to remove byproducts or to limit their formation. The process gives tetraphenylborates in a homogeneous technical grade, i.e. in a narrow particle size distribution and in a particular particle shape, which improves the dispersibility in the medium to be used.

Abstract: Cyclic polysulfonyldiallylammonium salts which are obtainable bya) copolymerization of salts, preferably halides, of monomeric diallylammonium components of the formula (I) ##STR1## with sulfur dioxide or a compound which liberates sulfur dioxide, and b) anion exchange, the anions, preferably the halide ions, of the diallylammonium components being completely or partially replaced by the anions A, the diallylammonium components being in each case cyclized to give a five- or six-membered ring and being connected to one another by one or more divalent radicals --SO.sub.2 -- to form polymers, the polysulfonyldiallylammonium salts having a molecular weight of between 500 and 5,000,000,and the ratio of the number of diallylammonium components to the number of divalent SO.sub.2 radicals being from 1:0.

Abstract: Ionic monomeric diallylammonium compounds having a targeted combination of diallylammonium cations with selected anions have particularly high and constant charge control properties and very good heat stabilities and dispersibilities.The compounds according to the invention are outstandingly suitable for use as colorless charge control agents in toners and developers for electrophotographic recording processes and for use as charge-improving agents in powders and paints for surface coating, in particular in triboelectrically or electrokinetically sprayed powder paints.