Optically variable multilayer film and optically variable pigment obtained therefrom
First Claim
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1. An optically variable multilayer film, comprising:
- (1) a metallic reflective layer M'"'"';
(2) two sub-unit multilayer stacks symmetrically mounted onto opposite surfaces of the metallic reflective layer M'"'"';
each of the stacks having a structure of D'"'"'MD, wherein D'"'"' and D are a protective layer and a color-presenting layer, respectively, and both are composed of low refractive index, high hardness, chemically stable silicon dioxide;
said protective layer D'"'"' further has an optical thickness which is 1/2 of the wavelength of the desired reflected light; and
M is a semi-transparent metallic layer;
said optically variable multilayer film being deposited on a flexible substrate S with a release layer R made of a neutral detergent, soluble in water or a solvent, deposited between said optically variable multilayer film and said flexible substrate S so as to form a structure of S-R-D'"'"'-M-D-M'"'"'-D-M-D'"'"'.
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Abstract
An optically variable pigment being formed from optically variable flakes. The optically variable multilayer is vacuum deposited onto a flexible polyester substrate having being provided with a release layer. An optically variable stack is formed from an opaque metallic reflective layer and two sub-unit film stacks D'"'"'MD symmetrically stacked on the opposite surfaces of the metallic reflective layer. D is adjacent to the reflective layer and is a color-presenting layer and D'"'"' is an outer layer of the stack which is used to protect the multilayer film to obtain better color-presenting. M is a semitransparent metallic layer, e.g. chromium.
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5 Claims
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1. An optically variable multilayer film, comprising:
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(1) a metallic reflective layer M'"'"'; (2) two sub-unit multilayer stacks symmetrically mounted onto opposite surfaces of the metallic reflective layer M'"'"';
each of the stacks having a structure of D'"'"'MD, wherein D'"'"' and D are a protective layer and a color-presenting layer, respectively, and both are composed of low refractive index, high hardness, chemically stable silicon dioxide;
said protective layer D'"'"' further has an optical thickness which is 1/2 of the wavelength of the desired reflected light; and
M is a semi-transparent metallic layer;said optically variable multilayer film being deposited on a flexible substrate S with a release layer R made of a neutral detergent, soluble in water or a solvent, deposited between said optically variable multilayer film and said flexible substrate S so as to form a structure of S-R-D'"'"'-M-D-M'"'"'-D-M-D'"'"'. - View Dependent Claims (2, 3, 4, 5)
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Specification