The present invention relates to a toner and process for preparing a toner for reproduction of a metallic, preferably golden or silvery, hue by a printing process, especially for electrophotography. A congeneric process and/or a congeneric toner is preserved with regard to its metallic hue and at the same time not to impair the essential properties of the toner for the printing process in which it is to be used. At least one metallic pigment is provided with a coating of silicate and subsequently with an organic layer containing a charge control agent and optionally a colorant and combining the thus obtained particle with toner material.

Method for preparing toner and the toner

The invention describes a method providing prints with fluorescent effects on a document generated by color electrophotographic print processes. It is an object of this invention to provide a method to print fluorescent toners together with and beside the process colors allowing to have fluorescent marks on the paper without significantly coloring these areas. These objectives can be achieved according to the present invention by using florescent toner in the fifth print module station of an electrophotographic printer equipped with five print modules, where four printing stations are equipped with black, yellow, magenta and cyan toners and a fifth station is equipped with substantially clear fluorescent toners to be printed on top of the color toners In further developments of the present invention, the clear fluorescent toner absorbs light in the UV-A range or comprises metallic pigments or metallic effect pigments added to the clear fluorescent toner.

Method for providing prints with fluorescent pigments containing toners and the print item

Printed products, printing methods and methods for authenticating a printed product are provided. In one aspect, the printed product has a receiver member and an image formed thereon by an electrophotographic printing process using toner particles, said image having at least one portion being at least partially formed by bi-fluorescent toner particles. Methods for printing and authenticating the same are provided.

Printed product with authentication bi-fluorescence feature

Printed products, printing methods and methods for verifying authenticity of a printed product are provided. In one aspect, the printed product has a receiver and an image formed thereon by an electrophotographic process using toner particles, said image having at least one raised portion, wherein at least parts of said raised portion of said image comprise phosphorescent or fluorescent toner particles.

Security enhanced printed products and methods

A microencapsulated toner has a shell wall of an azo and/or triazene group-containing photo-and/or thermo-labile polyurethane or polyurea, and functional core material comprising a liquid mixture with a DIN 51562 kinematic viscosity at 100 deg C below 5,000 mm /s. The shell wall is mechanically and thermally stable at below 100 deg C.

Microencapsulated toners having shell walls of azo and/or triazene group-containing photo-and/or thermo-labile polyurethanes or polyureas to give lower fracture, and hence fixing, temperature

The invention relates to a conductive liquid developer having a dynamic viscosity lower than 5000 mPa.s at a temperature of 25 DEG C and a shear rate of 10 s , a dynamic surface tension of 15-65 mN/m at 25 DEG C and 2 Hz and an electric conductivity higher than 10 . OMEGA cm at 20 DEG C. The invention also relates to the use of said liquid developer for electrographic printing or electrographic copying.

Klaus Hanke

Papers

Microencapsulated toners having shell walls of azo and/or triazene group-containing photo-and/or thermo-labile polyurethanes or polyureas to give lower fracture, and hence fixing, temperature

Use of a conductive liquid developer for electrographic printing or copying