Clariant Finance (bvi) Limited

Clariant Corporation

Arpad Acs

Martin Ulrich Schmidt

Ruediger Jung

Till Borchert

R&uuml;diger Jung

Klaus Saitmacher

Franz Schui

Steffen Schneider

The invention relates to a colorant of the formula (2) where M=Ca, Sr or a combination of Ca and Sr.

Phenylpyrazolone colorant

The invention relates to a pigment composition based on P.Y. 191 of the formula (1) containing 0.05 to 30 mol %, based on the sum of P.Y. 191 and a further yellow colorant, of at least one further yellow colorant of the formula (2) and/or of C.I. Pigment Yellow 100 in which R1, R2, R3 and R4 are each independently hydrogen, halogen, &#x2014;CH, &#x2014;NO, or NH&#x2014;R6 where R6 is C-C-alkyl; R5 is methyl or carboxyl, and where the compound of the formula (2) is not C.I. Pigment Yellow 191.

Pigment composition based on C.I. pigment yellow 191

C.I. Pigment Yellow 191 is obtained in new crystal polymorphs (beta, gamma, delta and epsilon phases) if the known alpha phase or another inventive phase of this pigment is treated with certain solvents and reprecipitated.

Crystal polymorphs of C.I. Pigment Yellow 191 and their preparation

The invention relates to a pigment preparation comprising an organic pigment and 0.2 to 20% by weight, based on the total weight of the pigment preparation, of an ammonium polyphosphate or of an organophosphorus compound.

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Schwalbach, Germany

Arpad Acs