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AssigneeHoechst Aktiengesellschaft
InventorsHans-Tobias Macholdt, Adolf Kroh, Alexander Sieber, Erwin Dietz
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Quinacridones having selectively adjusted triboelectric effects, which quinacridones contain about 0.05% to 100 percent by weight of triboelectrically active compounds of the general formula I Q--A--Y].sub.n (I), in which Q is a quinacridone radical which is unsubstituted or substituted by halogen atoms, alkyl, alkoxy H.sub.2 N--CO--, alkyl--NH--CO-- or (alkyl).sub.2 N--CO groups, A is a direct bond or --O--, --S--, --NR.sup.1 --, --CO--, --SO.sub.2 --, --CR.sup.2 R.sup.3 -- or arylene and Y is an --NR.sup.4 R.sup.5 group or a five-, six- or seven-membered heterocycle which contains one to three heteroatoms from the series comprising nitrogen and/or oxygen and/or sulfur and which can be substituted by alkyl, alkoxy, hydroxyphenyl, halogen, --CN, --COOH, --CO-- NRR', --SO.sub.2 --NRR', hydroxyalkyl or alkylaminoalkyl, in which R and R' together with the nitrogen atom can be a heterocycle, R and R' are hydrogen atoms or alkyl and R.sup.1 to R.sup.5, independently of one another, are each hydrogen and/or alkyl or alkenyl of 1 to 22 carbon atoms and n is a number from 1 to 4, and their use for the preparation of toners or developers which are used for electrophotographic copying or reproduction of originals and for printing electronically, optionally or magnetically stored information or are used in color proofing.
A quinacridone having selectively adjusted triboelectric effects which quinacridone contains about 0.05% to 100 percent by weight of triboelectrically active compounds of the general formula I
A quinacridone pigment having selectively adjusted triboelectric effects, which quinacridone contains about 0.05% to about 30 percent by weight of triboelectrically active compounds of the general formula I
Dependencies are inferred from the claim text.