Patent ID: 9678475
Date: 2017-06-13
CPC Classifications: B42D,C09D,G02B,G03H

Claim:
1. A security element, comprising: a) a substrate; b) a volume hologram formed in a refractive index modulated layer, which is obtained by holographically exposing a recording material to actinic radiation and thereon; and c) an embossed surface relief microstructure on at least a portion of the refractive index modulated layer, wherein the embossed surface relief microstructure comprises: wherein the pigment to binder ratio is from 4:1 to 1:1000, the security element exhibits a gold color in reflection when viewed from the side of the embossed surface relief microstructure, a green color in reflection viewing the volume hologram from the unembossed reverse side, and a blue color in transmission, and wherein when the platelet shaped transition metal particles have a diameter from 15-40 nm and a height of 8-20 nm, the security element shows an angle dependent color change upon viewing from orange to blue, when the platelet shaped transition metal particles have a diameter from 30-70 nm and a height of 8-20 nm, the security element shows an angle dependent color change upon viewing from red to green, and when the platelet shaped transition metal particles have a diameter from 5-120 nm and a height of 7-17 nm, the security element shows an angle dependent color change upon viewing from blue to gold.