Basf Aktiengesellschaft

Werner Jettmar

Rudolf Polster

Joachim Kranz

Helmut Junge

Reinhard Sappok

Eduard Hartmann

Wolf D Fechner

Hans Olschner

Robert Nett

The abrasiveness of a pigment or printing ink is reduced by incorporation of one or more finely divided substances which are insoluble in printing inks and have a Mohs hardness of from 4.5 to 8, suitable compounds being iron powder, compounds of iron, zirconium, silicon and magnesium, aluminum silicates, oxides of manganese, tin and cerium, or mixtures of these. The printing inks obtained cause substantially less, or virtually no, abrasion of gravure printing cylinders.

Less abrasive pigment or printing ink, and method of reducing abrasion

A process for converting crude copper phthalocyanine to a pigmentary form, wherein finely divided and heavily agglomerated crude copper phthalocyanine which exhibits disturbed crystallization and which has a primary particle size of less than 0.1 .mu.um is introduced into an organic or aqueous organic medium together with from 0.5 to 7% by weight, based on the crude copper phthalocyanine, of a basic copper phthalocyanine of the formula ##STR1## or of mixtures thereof (where CuPc is an n-valent copper phthalocyanine radical, R.sup.1 is H or alkyl of 1 to 4 carbon atoms, A is linear or branched alkylene, R.sup.2 is alkyl of 1 to 20 carbon atoms, alkoxyalkyl of 3 to 12 carbon atoms or cycloalkyl of 6 to 8 carbon atoms, R.sup.3 is H, alkyl of 1 to 4 carbon atoms or cycloalkyl of 6 to 8 carbon atoms or ##STR2## is a saturated heterocyclic 5-membered, 6-membered or 7-membered ring, and n is an integer from 1 to 6), and the suspension is heated at from room temperature to 180.degree. C until the pigment exhibits optimum tinctorial strength. Pigments of high tinctorial strength, which give colorations having a pure hue, are obtained.

Conversion of crude copper phthalocyanines to a pigmentary form

A phthalocyanine formulation which is stabilized against recrystallization and change of modification and which contains, as the stabilizer (a) a finely divided phthalocyanine as the pigment and (b) a salt or the corresponding homogeneous mixture of (.alpha.) a phthalocyanine derivative, which carries basic groups ##STR1## (R.sup.1 = H, alkyl of 1 to 20 carbon atoms, unsubstituted or substituted phenyl, --C.sub.2 H.sub.4 --NH).sub.z H or --(C.sub.3 H.sub.6 --NH).sub.z H, z = 1, 2 or 3, and R.sup.2 = H, alkyl of 1 to 6 carbon atoms or cycloalkyl of 6 to 8 carbon atoms) and (.beta.) an aliphatic sulfonic acid of 8 to 20 carbon atoms, a monoalkylbenzenesulfonic acid or dialkylbenzenesulfonic acid where alkyl is of 6 to 20 carbon atoms, or a monoalkylnaphthalenesulfonic acid or dialkylnaphthalenesulfonic acid where alkyl is of 6 to 20 carbon atoms, which acids may be substituted by hydroxyl, the molar ratio of .alpha.:.beta. being from 1:1 to 1:5, and, if desired, one or more organic fluids or solutions of resins in these fluids. The formulations are stable even in aromatic hydrocarbons and produce pure, deep colorations which have high gloss.

Phthalocyanine formulations having high gloss, which are stabilized

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Mannheim, Germany

Werner Jettmar