Polymer ammonium borates and processes for their preparation

A polymeric ammonium borate having a molecular weight from about 5000 to about 500,000 and obtained by homopolymerization of monomers of the formula (I) or (II) and by copoymerization of mixtures of two monomers of the formula (I) to (III), having molar monomer ratios (I):(II) and (I):(III) and (II):(III) of about 0.5:0.5 to about 0.95:0.05 in the copolymer, followed, if desired, by anion exchange ##STR21## in which the radicals R.sub.1 to R.sub.16 and R.sub.1 ' to R.sub.16 ' independently of one another, are each a hydrogen atom, halogen atom, a hydroxyl radical, a primary, secondary or tertiary amino radical, a carboxyl or carboxylic ester radical, a sulfo or sulfonic ester radical, a cyano or nitro radical and the radicals R.sub.1 and R.sub.2 or R.sub.1 ' and R.sub.2 ', independently of one another and in addition to the meanings given above, are ether radicals, or form a saturated or unsaturated, aromatic or non-aromatic 5- to 7-membered ring, which optionally contains further nitrogens oxygen or sulfur atoms or a combination of said atoms and the radicals R.sub.3 to R.sub.12 or R.sub.3 ' to R.sub.12 ', independently of one another and in addition to the meanings given above, are polyoxyalkylene radicals of the formula --(alkylene (C.sub.1 -C.sub.5)--O).sub.n --R, in which R is a hydrogen atom, an alkyl (C.sub.1 -C.sub.4) radical or an acyl radical and n is a number from 1 to 10, and the radicals R.sub.13 to R.sub.16 or R.sub.13 ' to R.sub.16 ', independently of one another and in addition to the meanings given above, are aliphatic or cycloaliphatic radicals, aryl or heteroaryl or aralkyl radicals optionally being substituted by alkyl (C.sub.1 -C.sub.4), alkoxy (C.sub.1 -C.sub.4), aryl radicals or halogen atoms, and the radicals R.sub.17 to R.sub.20, independently of one another, are each a hydrogen atom, chlorine atom, bromine atom, a hydroxyl radical, a primary, secondary or tertiary amino radical, a carboxyl or carboxylic ester radical, a sulfo or sulfonic ester radical, a cyano or nitro radical or are each a polyoxyalkylene radical of the formula --(alkylene (C.sub.1 -C.sub.5)--O).sub.n --R, in which R is a hydrogen atoms an alkyl (C.sub.1 -C.sub.4) radical or an acyl radical and n is a number from 1 to 10, and the mixtures of these compounds washed chloride free and dried whereby charge control in a toner and a developer for an electrophotographic recording process, and charge improvement in powders and surface coatings is achieved.