Optical effect layers showing a viewing angle dependent optical effect; processes and devices for their production; items carrying an optical effect layer; and uses thereof

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United States of America Patent

PATENT NO 9724956
APP PUB NO 20150352888A1
SERIAL NO

14759831

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The invention relates to the field of the protection of security documents such as for example banknotes and identity documents against counterfeit and illegal reproduction. In particular, the invention relates to optical effect layers (OEL) showing a viewing-angle dependent optical effect, devices and processes for producing said OEL and items carrying said OEL, as well as uses of said optical effect layers as an anti-counterfeit means on documents. The OEL comprises a plurality of non-spherical magnetic or magnetizable particles, which are dispersed in a coating composition comprising a binder material, wherein in at least a loop-shaped area of the OEL at least a part of the plurality of non-spherical magnetic or magnetizable particles are oriented such that their longest axis is substantially parallel to the plane of the OEL, and wherein, in a cross-section perpendicular to the OEL and extending from the center of the central area, the longest axis of the oriented particles present in the loop-shaped area forming the impression of the loop-shaped body follow a tangent of either a negatively curved or a positively curved part of a hypothetical ellipse or circle.

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Patent Owner(s)

Patent OwnerAddress
SICPA HOLDING SAAVENUE DE FLORISSANT 41 PRILLY 1008

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Degott, Pierre Crissier, CH 66 993
Despland, Claude Alain Prilly, CH 7 180
Loginov, Evgeny Renens, CH 37 311
Schmid, Mathieu Lausanne, CH 48 492

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