Ciba Specialty Chemicals Corporation

Ciba-geigy Corporation

Iain Frank Fraser

Ian Alexander Macpherson

Sharon Kathleen Wilson

Stephen John Coughlin

Abul Iqbal

William Ewen Smith

Peter Cyril White

Calum Hugh Munro

Alison MacLennan

Philippe Bugnon

Robert Langley

Thomas Healy

Greig Chisholm

David Macdonald Smith

Wern T Tsai

Phillipe Bugnon

Stephen Haggata

Stuart Cook Niven

Gordon Mitchell

Simon Martyr

Ian Alexander MacPherson

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

A process for the preparation of organic pigments with enhanced fluorescence, which process comprises treating said pigments with a surfactant, and to the fluorescent organic pigments obtained by said process. The pigments according to the present invention can be used in marking applications, wherein durable fluorescence is required.

Method of improving pigment fluorescence

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

The present invention provides an ink which contains a SERS--active metal aggregate containing a Raman active compound.

Pigment compositions

A plastics composition comprising a high molecular weight material and an effective coloring amount of an azo pigment of formula ##STR1## where M is Mg, Ca, Sr, Ba or Mn or a mixture of two or more thereof, R.sup.1 and R.sup.2 are chlorine or methyl, x is zero or 1, y is zero or 1 and the sum of x and y is 1, with the proviso that when the high molecular weight material is polyvinyl chloride y is zero.

Pigmented plastics compositions

The present invention provides a phthalocyanine of Formula (1): ##STR1## wherein: MPc is a phthalocyanine nucleus of Formula (2); ##STR2## in which M is a metal atom, a chloro-metal group, an oxy-metal group or hydrogen

Substituted phthalocyanines

The invention provides a pigment composition comprising a pigment having adsorbed on its surface, or as a physical mixture, up to 10% by weight, based on the total weight of pigment composition of a coding compound which is a compound containing an azo, azomethine or polycyclic chromophore and which has an absorption spectrum and a Raman spectrum different from that of the pigment. The compositions are suitable for use in printing inks for security applications.

A pigment composition comprising (A) an azo pigment, (B) an azo reaction product of (i) a diazonium salt of a primary aromatic amine having a carboxyl group or sulphonic acid group meta or para to an amino group with (ii) a coupling component comprising one or more unsubstituted or substituted naphthols, at least 50 mole % of said coupling component being a naphtholsulphonic acid, or a salt of said reaction product, and, optionally, (C) an organic resin containingan acidic group or a salt thereof.

A process for improving the storage stability of a colored organic pigment in powder form which comprises coating pigment particles with a partially or completely hydrolysed compound of an element of Group IVA or Group IVB of the Periodic Table in its IV oxidation state, thereby inhibiting reduction of the tinting strength of the pigment on storage.

Process for improving storage stability of pigments

A method of improving the storage stability of a coloured organic pigment in powder form which comprises coating pigment particles with a solid polymer which is a polar group-containing vinyl polymer, said polar group being a hydroxy, carboxyl, carboxylic ester, anhydride or carboxamide group, or a cellulosic polymer, thereby inhibiting reduction of tinting strength of the pigment on storage.

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Kilbirnie, United Kingdom

Iain Frank Fraser