Effect pigments having a strong color flop

Details Effect pigments having a strong color flop Effect pigments having a strong color flop

2007-01-30

2007-01-30

Green, Anthony J. (Department: 1755)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C106S446000, C106S457000, C106S491000

Reexamination Certificate

active

11332512

ABSTRACT:
The present invention relates to effect pigments having a color flop comprising metal oxide-coated SiO2flakes having a uniform layer thickness, where the color flop runs through all four quadrants of the a,b color coordinate system (CIELAB L,a,b system). The present invention likewise relates to processes for the preparation of these pigments in which SiO2flakes having a uniform layer thickness are coated with metal oxides, and to the use of these pigments in cosmetics, paints, coatings, plastics, films, in security printing, in security features in documents and identity papers, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations.

REFERENCES:
patent: 5753024 (1998-05-01), Vogt et al.
patent: 6630018 (2003-10-01), Bauer et al.
patent: 6656259 (2003-12-01), Pfaff et al.
patent: 7-228515 (1995-08-01), None
patent: 9-71417 (1997-03-01), None
patent: WO 93/08237 (1993-04-01), None

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