Pigment red 112 with enhanced dispersibility
AssigneeClariant Finance (BVI) Limited
InventorsLars Schneider, Martin Reif
Life of this patent
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Abstract
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.
Claims11
An uncoated C.I. Pigment Red 112 having a dispersion harshness in alkyd resin varnish of less than or equal to 45.
An uncoated C.I. Pigment Red 112 having a dispersion hardness in alkyd resin varnish of less than or equal to 45 made by a process comprising the steps of 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.
Dependencies are inferred from the claim text.