Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Reexamination Certificate
2007-01-02
2007-01-02
Green, Anthony J. (Department: 1755)
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
C427S215000, C427S218000, C427S255190, C427S255310, C428S403000, C428S404000
Reexamination Certificate
active
11331449
ABSTRACT:
The present invention relates to intensely colored red effect pigments comprising iron oxide-coated SiO2flakes, where the total thickness of the effect pigments is not greater than 500 nm (+/−30 nm). The present invention likewise relates to processes for the preparation of these pigments in which SiO2flakes are coated with iron oxide, where the thicknesses of the SiO2flakes and of the iron-oxide layers are selected in such a way that the total thickness of the red effect pigments is not greater than 500 nm (+/−30 nm), 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.
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patent: 5441564 (1995-08-01), Vogt
patent: 6488756 (2002-12-01), Schoen et al.
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patent: 6875264 (2005-04-01), Zimmermann et al.
patent: WO 93/08237 (1993-04-01), None
Dietz Johann
Foerderer Cornelia
Pfaff Gerhard
Warthe Doreen
Green Anthony J.
Merck Patent GmbH
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