Clariant Finance (bvi) Limited

Lars Schneider

Carsten Plueg

Tanja Reipen

Jens Reichwagen

Matthias Ganschow

David Blum

Martin Reif

Carsten Plüg

The invention relates to a pigment composition that is composed of compounds of formulas (I), (II) and (III), is characterized by a average particle size dranging from 10 to 60 nm, less than 5% by volume of the particles being greater than 70 nm, and can be obtained by reacting of 1 mol of a succinic acid diester with 2 mol of a mixture of nitriles A-CN and B-CN nitriles, the molar ratio of A-CN and B-CN in the nitrile mixture being in the range from 99.5:0.5 to 85.0:15.

Diketopyrrolopyrrole pigment composition for use in color filters

The invention provides a process for preparing uncoated, readily dispersible C.I. Pigment Red 112 by azo coupling in a microreactor, which comprises precipitating the coupling component in an upstream microreactor and coupling the precipitated coupling component in finely divided form to the diazo component in a microreactor. The C.I. Pigment Red 112 of the invention features low dispersion harshness in alkyd resin varnish, and a PCB content of below 25 ppm.

Pigment red 112 with enhanced dispersibility

The invention provides a pigment preparation comprising 

P.R. 254 pigment preparation for use in color filters

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Liederbach, Germany

Lars Schneider