OPTICAL EFFECT LAYERS SHOWING VIEWING ANGLE-DEPENDENT OPTICAL EFFECT; PROCESSES AND DEVICES FOR THEIR PRODUCTION; ITEMS CARRYING OPTICAL EFFECT LAYER; AND USES THEREOF Russian patent published in 2018 - IPC B05D3/00 

FIELD: polygraphy.

SUBSTANCE: invention relates to the field of protecting 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. OEL comprises a plurality of non-spherical magnetic or magnetisable 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 non-spherical magnetic or magnetisable 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 centre 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.

EFFECT: invention enables to achieve a noticeable dynamic loop-like effect made in the form of a larger number of figures and shapes.

18 cl, 21 dwg