Patent ID: 8500901

Claim:
Interference pigments based on coated flake-form substrates, comprising a substrate coated with (A) a first layer on said substrate of SiO 2 having a layer thickness of 5-350 nm, followed by (B) a high-refractive-index coating having a refractive index n of >1.8, that consists of TiO 2 , Fe 2 O 3 , Fe 3 O 4 , Cr 2 O 3 , or titanium suboxides and/or (C) an interference system consisting of alternating high- and low-refractive-index layers, said high index layers being those of (B), and optionally thereon (C1) a semi-transparent metal layer, and/or (D) an outer protective layer, wherein the flake-form substrates are flake-form aluminium oxide or glass flakes.