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 B05D5/06 G03G15/08 

FIELD: printing industry.

SUBSTANCE: invention relates to the protection of security documents, such as, for example, banknotes and identity documents, from counterfeiting and illegal reproduction. 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. OEL comprises two or more loop-shaped areas that are nested around a common central area that is surrounded by the innermost loop-shaped area. In each of the loop-shaped areas, at least a part of the plurality of non-spherical magnetic or magnetisable particles are oriented such that, in a cross-section perpendicular to the OEL layer and extending from the centre of the central area to the outer boundary of the outermost loop-shaped area, the longest axis of the particles in each of the cross-sectional areas of the looped-shaped areas follow a tangent of either a negatively curved or a positively curved part of hypothetical ellipses or circles.

EFFECT: technical result is the manufacture of an optical effect layer that is difficult to manufacture, is easy to verify, regardless of the orientation of the protected document.

22 cl, 43 dwg, 1 tbl, 4 ex