Ciba Specialty Chemicals Corporation

Stephen John Coughlin

Iain Frank Fraser

Thomas Healy

Ian Alexander Macpherson

Greig Chisholm

David Macdonald Smith

Stephen Haggata

Stuart Cook Niven

Simon Martyr

A process for the preparation of pigment compositions which give improved ink flow is provided which comprises treating the pigment, during the pigment synthesis, with a small amount of a long chain aliphatic amine. The pigment compositions obtained can be used for preparing millbase inks which due to their improved flow viscosity (rheology) at high pigmentation can be easily handled as well as flexibly formulated, e.g. a number of final printing inks for different ink applications can be manufactured from a single millbase in a very economical manner. The final inks are preferably used in packaging gravure printing processes.

Pigment compositions for inks with improved rheology

Pigment composition comprising an organic pigment and a combination of at least two normally water-soluble coloured compounds (dyes) of opposing charge, i.e. of at least one anionic and one cationic dye are provided. The compositions impart improved rheology on non-aqueous pigment based printing inks and paints.

Compositions and methods for imparting improved rheology on pigment based inks and paints

Azo compounds of formula (I), wherein X stands for halogen, in particular for chlorine, or C-Calkoxy, in particular for methoxy, Y stands for &#x2014;CH&#x2014; or &#x2014;O&#x2014;, Rand R, independently from each other, stand for hydrogen, C-Calkyl, or C-Caryl, which may be substituted up to three times with C-Calkyl, C-Calkoxy or halogen, a process for their preparation and their use as fluorescent compounds, in particular as solid fluorescent compounds, such as for special effect printing, sectrity printing or in the opto-electronic field.

Fluorescent pigments

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Muirhead, United Kingdom

Stephen John Coughlin