Patent ID: 9453131
Filing Date: 2016-09-27
CPC Classification: B82Y,C01P,C09C,C09D,Y10T

Claim Text:
1. A metallic effect pigment consisting of (a) a single layer which comprises metal nanoparticles and a metal oxide phase, the metal of the metal oxide phase and the metal of the metal nanoparticles being identical in the layer, wherein the layer has a diffractive structure and wherein the layer has a first outer face and a second outer face, the amount of metal nanoparticles in the first outer face differs from the amount of metal in the second outer face by at least 10 atom % or (b) two layers disposed one atop the other, with at least one layer comprising metal nanoparticles in a metal oxide phase, and the metal of the metal oxide phase and the metal of the metal nanoparticles being identical in the at least one layer, wherein the at least one layer has a first outer face and a second outer face, the amount of metal nanoparticles in the first outer face differs from the amount of metal in the second outer face by at least 10 atom %, and wherein the two layers have a diffractive structure wherein the metallic effect pigment exhibits an optical rainbow effect from diffraction of incident light at the diffractive structure.