Pigment compositions

Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...

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106 3175, 106 3176, 106 3177, 106 3178, 106 3179, 106 318, 106 3181, 106410, 106411, 106493, 106494, 106495, 106496, 106497, 106498, 162134, 101491, 264 78, 264134, 283 91, 427197, 428195, 902 7, 902 28, C09B 6750

Patent

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057187541

ABSTRACT:
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.

REFERENCES:
patent: 4720304 (1988-01-01), Ruff et al.
patent: 5324567 (1994-06-01), Bratchley et al.

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