Sicpa Holding Sa

Consortium Fur Elektrochemische Industrie Gmbh

Adolf Gurtner

Michael Kasch

Volker Stanjek

Franz-Heinrich Kreuzer

Horst Leigeber

The invention discloses a multilayer of cholesteric liquid crystal polymer (CLCP), wherein at least two layers of CLCP differing in at least one optical property are arranged on top of each other, characterized in that said at least two layers are chemically inter-layer cross-linked through the polymer network, such as to form a mechanically unique solid body which can be comminuted to pigment without deterioration of its inner structure, and which has an abrupt change of cholesteric liquid crystal pitch at the interface between said at least two layers of cholesteric liquid crystal polymer. Corresponding pigments, coating compositions and there use in security and decorative printing and coating applications are disclosed as well.

Cholesteric multi-layers

The invention provides novel cholesteric monolayers and pigments obtained therefrom with high brilliance and viewing angle-dependent color change (color-flop/tilt effect) with additional particular properties such as magnetizability, conductivity, fluorescence, phosphorescence and increased hiding power, a process for their production and their use.

Cholesteric monolayers and monolayer pigments with particular properties, their production and use

The invention relates to a method of producing platelets, wherein a material to be processed into platelets is applied in a flowable or gaseous state to a substrate, consolidated, removed from the substrate, and subjected to a crushing or grinding process, wherein the material is applied to the substrate in succeeding layers such that after application, a lamina pack is present which, in cross section perpendicular to its surface, has individual laminae of a thickness of between 0.2-1000 &mgr;m, and said lamina pack, having been stripped from the substrate, is treated in such a way that the material disintegrates into individual laminae and the individual laminae are reduced in size to a particle size of 0.5-10000 &mgr;m.

Growing community of inventors

Wildenau, Austria

Adolf Gurtner