The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 2007
Filed:
Jan. 13, 2006
Gerhard Pfaff, Muenster, DE;
Cornelia Foerderer, Heppenheim, DE;
Doreen Warthe, Griesheim, DE;
Johann Dietz, Dietzenbach, DE;
Gerhard Pfaff, Muenster, DE;
Cornelia Foerderer, Heppenheim, DE;
Doreen Warthe, Griesheim, DE;
Johann Dietz, Dietzenbach, DE;
Merck Patent GmbH, Darmstadt, DE;
Abstract
The present invention relates to intensely colored red effect pigments comprising iron oxide-coated SiOflakes, 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 SiOflakes are coated with iron oxide, where the thicknesses of the SiOflakes 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.