Ciba Specialty Chemicals Corporation

Ciba-geigy Corporation

Ian Alexander Macpherson

Iain Frank Fraser

Sharon Kathleen Wilson

James M McCrae

William Ewen Smith

Peter Cyril White

Calum Hugh Munro

Greig Chisholm

Brian Tuck

Ian R Wheeler

John Andrew Stirling

Alexander M Irvine

David Macdonald Smith

John Aldred Nimmo

Stephen John Coughlin

Simon Martyr

Vincent J Cavalieri

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

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

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.

The present invention provides a method of reducing the tendency of a resinated pigment product to self-heat which comprises treating an aqueous slurry of the pigment with a compound of a multivalent metal or metalloid under conditions such as will precipitate an insoluble compound of the metal or metalloid on the pigment, and then isolating the treated pigment.

Resinated pigment compositions

A process for producing a pigment or dyestuff composition in the form of dustless readily dispersible granules, which process comprises contacting, with agitation, an aqueous dispersion of a pigment and a composition comprising one or more organic acids which are liquid at temperatures below 100.degree. C. or their salts, at a pH value at which the acid is insoluble in water, the temperature being maintained during contacting above the melting point of the acid until the pigment has completely transferred into the organic phase; increasing the pH to a value suitable to render the acid soluble in water and recovering the resulting granules.

Process for the preparation of dustless, readily-dispersible pigment or

A process for the production of a compound of the formula: ##STR1## in pigmentary form having a mean particle size not exceeding 0.3 microns, comprising:

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Fife, United Kingdom

Ian Alexander Macpherson