Ink composition comprising first and second optically variable pigments
AssigneeSicpa Holding SA
InventorsAnton Bleikolm, Olivier Rozumek, Edgar Müller
Life of this patent
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Abstract
An ink composition containing at least two different types of optically variable pigments which produce a film or coating having a viewing angle dependent color shift.
Claims35
An ink composition comprising:
- a polymer resin binder;
- a blend comprising first optically variable dichroic pigment flakes, said flakes comprising a comniinuted multi-layered thin film interference structure comprising a stack of entirely parallel and planar layers in which at least one of the layers is totally reflecting, having first and second planar surfaces parallel to each other, and deposited on at least one of the planar surfaces, at least one dielectric layer which is transparent to visible light;
- and
- second optically variable dichroic pigments comprising a multi-layered thin film interference structure comprising a reflecting plate-like core layer in which the reflecting core layer is completely enclosed by at least one layer selected from the group consisting of transparent dielectric layer, semi-opaque metal layer and metal-oxide layer;
- said first and the second optically dichroic pigments being selected so that they are not chromatically antagonistic to one another.
An ink composition comprising:
- a polymer resin binder;
- a blend comprising first optically variable dichroic pigment flakes, said flakes comprising a committed multi-layered thin film interference structure comprising a stack of entirely parallel and planar layers in which at least one of the layers is totally reflecting, having first and second planar surfaces parallel to each other, and deposited on at least one of the planar surfaces, at least one dielectric layer which is transparent to visible light;
- and
- second optically variable multi-layered thin film dichroic pigments comprising a reflecting plate-like core layer in which the reflecting core layer is completely enclosed by at least one layer selected from the group consisting of transparent dielectric layer, semi-opaque metal layer and metal-oxide layer;
- the first optically variable dichroic pigment and the second optically variable dichroic pigment having hues which are substantially the same.
A blend of first optically variable dichroic pigment flakes, said flakes comprising a committed multi-layered thin film interference structure comprising a stack of entirely parallel and planar layers in which at least one of the layers is totally reflecting, having first and second planar surfaces parallel to each other, and deposited on at least one of the planar surfaces, at least one dielectric layer which is transparent to visible light;
- and
- second optically variable dichroic pigments comprising a multi-layered think film interference structure comprising a reflecting plate-like core layer in which the reflecting core layer is completely enclosed by at least one layer selected from the group consisting of transparent dielectric layer, semi-opaque metal layer and metal-oxide layer;
- said first and the second optically dichroic pigments being selected so that they are not chromatically antagonistic to one another.
Dependencies are inferred from the claim text.