PIGMENT COMPOSITION

PROBLEM TO BE SOLVED: To obtain an ink containing surface enhanced resonance Raman scattering (SERRS) active sol, useful for printing bank bills and other bills, high in sensitivity, and capable of giving easily and quickly identifiable signals. SOLUTION: This pigment composition contains pref. 0.1-...

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Bibliographische Detailangaben
Hauptverfasser:	IAN ALEXANDER MACPHERSON, WILLIAM EWEN SMITH, IAN FRANK FRASER, MUNRO CALLUM HUGH, WILSON SHARON KATHLEEN, PETER CYRIL WHITE
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COLOUR PRINTING CORRECTING FLUIDS DYES FILLING PASTES INKS LINING MACHINES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS POLISHES PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES STAMPS TRANSPORTING TYPEWRITERS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain an ink containing surface enhanced resonance Raman scattering (SERRS) active sol, useful for printing bank bills and other bills, high in sensitivity, and capable of giving easily and quickly identifiable signals. SOLUTION: This pigment composition contains pref. 0.1-2wt.% of SERRS active sol. To obtain the sol, a soluble precursor such as a metal salt (pref. silver nitrate) is reduced by addition of a colloid-forming agent (pref. citrate) in an aqueous or solvent medium followed by addition of a flocculant [pref. poly(L-lysine)] to form flocculated colloid of surface enhanced Raman scattering (SERS) active metallic particles (in the above reduction, it is preferable that a coded compound having electron absorption frequency close to SERS plasmon resonance frequency (pref. copper phthalocyaninesulfonic acid) to adsorb the coded compound to the surface of the SERS active metal colloid).