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Magnetic thin film interference device or pigment and method of making it, printing ink or coating composition containing said magnetic thin fim interference device

A technology of magnetic films and magnetic materials, applied in the application of magnetic films to substrates, magnetic coatings, preparation of dyed pigments by PVD/CVD method, etc. Wide variety of effects

Inactive Publication Date: 2003-11-26
SICPA HLDG SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device according to US 4,838,648 has the notable disadvantages of i) reduced optical properties, especially due to the lower reflectivity of cobalt-nickel alloys, lower chromaticity compared to aluminum, and ii) lack of selective magnetic material flexibility

Method used

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  • Magnetic thin film interference device or pigment and method of making it, printing ink or coating composition containing said magnetic thin fim interference device
  • Magnetic thin film interference device or pigment and method of making it, printing ink or coating composition containing said magnetic thin fim interference device
  • Magnetic thin film interference device or pigment and method of making it, printing ink or coating composition containing said magnetic thin fim interference device

Examples

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Embodiment Construction

[0038] exist figure 2 In the first preferred embodiment of the magnetic OVP shown, a layer 4 of magnetic material is included between two total reflector layers 3, 3' of the OVP stack. In order to provide the best optical and magnetic interaction conditions, the optical interaction is done using the "standard" OVP layer sequence - chromium / magnesium fluoride / aluminum. In order to accommodate the magnetic function inside it in the form of any desired additional layer of magnetic elements, alloys or compounds, the aluminum layer is "divided in two".

[0039] On the carrier foil C coated with a release agent R, a first chromium absorber layer 1 is deposited, followed by a first magnesium fluoride dielectric material layer 2 and a first aluminum reflector layer 3 . A magnetic material layer 4 of magnetic material is then deposited, followed by a second aluminum reflector layer 3'. Then deposit a second magnesium fluoride dielectric material layer 2' and a second chromium absorb...

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Abstract

The invention discloses magnetic OVP, said pigment consisting of thin-layer flakes having a basic metal-dielectric-metal structure to result in a viewing-angle dependent color appearance, and having, in addition to said viewing-angle dependent color appearance, incorporated magnetic properties, to make them distinguishable from OVP of similar appearance but not having said magnetic properties. The invention discloses as well methods for obtaining such pigments and the use of such pigments as security elements in inks, coatings and articles.

Description

field of invention [0001] The present invention is in the field of optically variable pigments. Specifically, the present invention describes a magnetic thin-film interference device, a method for manufacturing the magnetic thin-film interference device, a magnetic thin-film interference pigment, a printing ink or a coating composition, secret documents, and applications of the magnetic thin-film interference device, all According to the provisions of the patent claims. Background of the invention [0002] Various types of optically variable devices can be used as effective anti-counterfeiting means for bank notes and secret documents. Most of the currency printed worldwide relies on such optically variable copy protection devices, from which people have learned to use optically variable inks (OVI TM ) Printing characteristics. [0003] Optically variable pigments (OVP) have viewing angle-dependent color phenomena that cannot be reproduced with co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B42D15/10B32B7/00B32B7/02B42D15/00C09C1/00C09C1/62C09C3/06C09D5/23C09D5/29C09D201/00G02B5/22G02B5/28H01F10/14H01F10/16H01F10/20H01F41/16
CPCC01P2006/42C09C2220/20C09C2200/1008C09C2200/306C09C2200/1004C09C2200/308Y10T428/31Y10T428/12986C09C2200/303Y10T428/12535Y10T428/12806Y10T428/12868C09C1/0078C09C1/0015Y10T428/24942Y10T428/12465G02B5/223Y10T428/32G02B5/22
Inventor M·赛托T·蒂勒E·米勒C-A迪斯普兰
Owner SICPA HLDG SA
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