Hoechst Aktiengesellschaft

Albrecht Manz

Hans-Tobias Macholdt

Claus Godau

Alexander Sieber

Gernot Lohr

Wilhelm Becker

Michael Schlipf

Process for enhancing the electrostatic chargeability of powder coatings or powders, and the use thereof for surface-coating solid objects. A process for enhancing the electrostatic chargeability of powder coatings or powders intended for surface-coating solid objects, by homogeneously incorporating at least one triarylmethane, azine, thazine and/or oxazine compound in an amount from about 0.01 to about 10 percent by weight into powder coatings or powders, the compounds mentioned being dissolved or dispersed in the powder coating system or powders.

Process for enhancing the electrostatic chargeability of powder coatings

Process for enhancing the electrostatic chargeability of powder coatings or powders, and the use thereof for surface coating solid objects. Process for enhancing the electrostatic chargeability of powder coatings or powders intended for the surface-coating of solid objects, by homogeneously incorporating at least one salt-like, cationic compound of the formula (1) ##STR1## in which R.sub.1, R.sub.2, R.sub.3 and R.sub.4, independently of one another, denote hydrogen atoms, straight-chain or branched alkyl groups having 1 to 30 carbon atoms, mononuclear or polynuclear cycloaliphatic radicals having 5 to 12 carbon atoms, oxethyl groups of the general formula --(CH.sub.2 --CH.sub.2 --O).sub.n --R in which n denotes a number from 1 to 10 and R denotes a hydrogen atom, a (C.sub.1 -C.sub.4)alkyl or acyl group, furthermore denote mononuclear or polynuclear aromatic radicals or araliphatic radicals, where the aliphatic, aromatic and araliphatic radicals may be substituted, and where the alkyl, cycloalkyl, aralkyl and aryl radicals for R.sub.1 to R.sub.4 may be substituted by halogen atoms, X denotes a phosphorus, arsenic or antimony atom, where, in the case where X denotes an arsenic or antimony atom, at least one of the radicals R.sub.1 -R.sub.4 is not a hydrogen atom, and A.crclbar. denotes the equivalent of an inorganic or organic anion, in an amount from about 0.01 to about 10 percent by weight into powder coatings or powders, the salt-like, cationic compounds of the formula (1) being dissolved or dispersed in the powder of coating system.

A process for enhancing the electrostatic chargeability of powder coatings or powders intended for surface-coating solid objects, by homogeneously incorporating at least one salt-like, cationic compound of the formulae (1) and/or (2) ##STR1## in which R.sub.1, R.sub.2, R.sub.3 and R.sub.4, independently of one another, are hydrogen atoms, straight-chain or branched alkyl groups having 1 to 30 carbon atoms, oxethyl groups of the formula --(CH.sub.2 --CH.sub.2 --O).sub.n --R in which R is a hydrogen atom or a (C.sub.1 -C.sub.4)alkyl or acyl group, and n is a number from 1 to 10, mononuclear or polynuclear cycloaliphatic radicals having 5 to 12 carbon atoms, mononuclear or polynuclear aromatic radicals or araliphatic radicals, R.sub.5 denotes a hydrogen, fluorine, chlorine or bromine atom or a (C.sub.1 -C.sub.6)alkoxy or primary amino group, and where R.sub.1 and R.sub.3 may be part of a ring system having 5 to 7 atoms and 0 to 3 double bonds, and A.sup.- denotes the equivalent of an anion, in an amount from about 0.01 to about 10 percent by weight into powder coatings or powders, where the salt-like cationic compounds of the general formulae (1) and (2) are dissolved or dispersed in the powder coating or powder.

Crosslinkable, fluorine-containing copolymers, comprising:

Crosslinkable, fluorine-containing copolymers as binders for highly

Heat hardenable binders comprising aqueous dispersions of solid epoxy resins of a special structure, wherein some of the glycidyl groups are converted into quaternary ammonium groups by means of primary and/or secondary amines and quaternization, and further containing hardeners and possibly other conventional additives, characterized in that they contain, as hardeners, polybasic water-soluble polycarboxylic acid units or the anhydrides or acid esters thereof having a COOH functionality of at least 3, and the use of the binders for the preparation of hardened products, particularly coatings.

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Wiesbaden, Germany

Albrecht Manz