Patent ID: 7993443
Filing Date: 2011-08-09
Classification: C01P,C09C,C09D,Y10T

Abstract:
1. A multilayer effect pigment comprising: a transparent substrate having a layer of titanium dioxide thereon, said layer having an optical thickness of about 85 to 385 nm, a layer of a low refractive index material on said titanium dioxide layer and an outermost layer of a high refractive index material placed on said low refractive index material layer, said high refractive index material comprises titanium dioxide having an optical thickness of from about 45 to 420 nm and the low refractive index material is silicon dioxide having an optical thickness of about 30 to 120 nm, and wherein at least one layer has an optical thickness which is different from all of the other layers, whereby the pigment is not a quarter-wave stack.