Printer Friendly

Optically variable pigments.

* Patent No. U.S. 6,521,036 B1

SICPA has obtained a patent for optically variable pigments having a color shift between two distinct predetermined colors. The optically variable pigment is comprised of a multilayer thin-film interference stack having first and second substantially parallel planar surfaces. The multilayer stack includes an opaque reflecting layer having first and second substantially planar surfaces that are parallel to the first and second parallel planar surfaces of the multilayer stack and at least one sequence disposed on one of the first and second surfaces of the opaque reflecting layer. Each sequence is comprised of a dielectric layer with an index of refraction of 1.65 or less and a semi-transparent partially reflecting layer with the dielectric layer of said sequence being first disposed on the totally reflecting layer, wherein the totally reflecting layer is made of a corrosion-resistant aluminum alloy by physical vapor deposition.
COPYRIGHT 2003 Rodman Publications, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2003 Gale, Cengage Learning. All rights reserved.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:Patent Update
Publication:Coatings World
Article Type:Brief Article
Geographic Code:1USA
Date:Sep 1, 2003
Previous Article:Fast-drying refinish basecoat.
Next Article:Coatings, adhesives and sealants.

Related Articles
Additive pigment powders.
Effect pigments with improved colorant adhesion.
Sun Chemical Performance Pigments' Russell Schwartz receives NAPIM's TAM Service Award.
Effect pigments based on thin Si[O.sub.2] flakes.
MultiColor effect pigments: these skin-tone effect pigments from the Taizhu Group enhance color and correct flaws with unique natural radiance.
Sherwin-Williams expands family of coatings utilizing Opti-Check Optically Active Pigment technology.

Terms of use | Copyright © 2016 Farlex, Inc. | Feedback | For webmasters