US 2016/0355693 A1 · COATING COMPOSITIONS FOR SECURITY ELEMENTS AND HOLOGRAMS

Abstract

The present invention relates to the use of coating compositions, comprising shaped transition metal, especially silver, particles and a binder, wherein the ratio of pigment to binder is preferably such that the resulting coating shows an angle dependent colour change, for the production of security elements and holograms. When the coating compositions of the present invention are used in coating a hologram the obtained products show a an angle dependent colour change (flip/flop effect), different colours in reflection and transmission, an extremely bright OVD image and extremely strong rainbow effect, high purity and contrast.

Claims20

Dependent claims

A method for forming for forming an optically variable image or device on a substrate, the method comprising:

a) forming an optically variable image (OVI) on a discrete portion of the substrate;
and
b) depositing a coating composition comprising
platelet shaped transition metal particles having a longest dimension of edge length of from 15 nm to 1000 nm and a thickness of from 2 nm to 100 nm, wherein the transition metal of the shaped transition metal particle is at least one selected from the group consisting of Cu, Au, and Pd, and
a binder on at least a portion of the OVI, to obtain a coating.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/224,789Filed 1 Aug 2016

Priority

EP 09177328.327 Nov 2009

Published

8 Dec 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification26 codes

C09D 7/61
Non-macromolecular: inorganic
B05D 3/007
Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate…:…
B41M 3/148
Security printing: transitory images, i.e. images only visible from certain viewing angles
B44F 1/14
Characterised by colour effects: iridescent effects

Coating compositions for security elements and holograms

Life of this patent

Coating compositions for security elements and holograms

Life of this patent

Abstract

Claims20