Agfa-gevaert

Agfa Graphics Nv

Agfa Nv

Marin Steenackers

Johan August Loccufier

Sam Verbrugghe

Kristof Heylen

Paul R Callant

Dirk Franky Kokkelenberg

Luc Decoster

Peter Hendrikx

Fabienne Goethals

Bart Aerts

Lionel Petton

Anouschka Depla

Peter Bries

A color laser markable composition includes at least a first and a second Diffusion Hindered Molecular Assembly (DHMA), each including a leuco dye and, respectively, a first and second sensitizer. With the laser markable composition, at least two different colors may be formed in a single layer.

Laser markable compositions, materials and documents

A color laser markable article includes at least a first and a second laser markable layer including, respectively, a first infrared dye IR-1 having an absorption maximum in the infrared region &#x3bb;(IR-1) and a second infrared dye IR-2 having an absorption maximum in the infrared region &#x3bb;(IR-2), characterized in that the color laser markable layers further include a Diffusion Hindered Molecular Assembly (DHMA) which contains a leuco dye.

Laser markable materials and documents

A laser markable material includes a laser markable layer, present as a self-supporting layer or as a layer on a support, the laser markable layer including an infrared absorbing dye and an infrared absorbing pigment, characterized in that the amount of the infrared absorbing pigment is between 10 ppm and 1000 ppm relative to the total dry weight of the laser markable layer.

A lithographic printing plate precursor includes (i) a support having a hydrophilic surface or which is provided with a hydrophilic layer, and (ii) a coating including a photopolymerisable layer, characterised in that the photopolymerisable layer includes a compound including at least one free radically polymerisable group and at least one moiety having a structure according to Formula (I): wherein X represents O or NR* and R* represents hydrogen, an optionally substituted alkyl, aryl, aralkyl or heteroaryl group; and * denotes the linking positions to the rest of the compound.

Lithographic printing plate precursor

A method of making a lithographic printing plate includes the steps of a) image-wise exposing a lithographic printing plate precursor including a hydrophilic support and a coating containing a colorant precursor to form a lithographic image consisting of printing areas and non-printing areas, b) developing the plate precursor to remove the coating in the non-printing areas from the support, and c) drying the plate precursor, and d) subjecting the plate precursor to heat or radiation to induce a colour change of the coating in the printing areas, wherein before step b) the coating in the non-printing areas and the support are characterised by a CIE 1976 colour difference &#x394;Ewhich is 5.0 or less, and after step d) the CIE 1976 colour difference &#x394;Ebetween the coating in the printing areas and the non-printing areas is more than 6.8.

Method for providing lithographic printing plates

A colour laser markable laminate includes a colour laser markable layer including a leuco dye and an infrared absorbing compound, an optional adhesive layer, a polymeric support, an optional outerlayer, wherein the colour laser markable layer further includes an acid scavenger. The support, the optional adhesive layer, or the optional outer layer includes a UV absorbing compound.

Colour laser markable laminates and documents

Infrared dyes having an infrared absorption maximum above 1130 nm with minor colouration in the visual spectrum. The infrared dyes are especially useful for producing multicolour laser marked security documents having reduced background coloration and enhanced colour gamut.

IR dyes and laser markable articles comprising such IR dyes

A color laser markable article includes a color laser markable layer provided on a support, the laser markable layer including an infrared absorbing compound; a leuco-dye; and an acid generating compound, wherein the acid generating compound has a structure according to Formulae (I) or (II): wherein R1 and R3 independently represent an optionally substituted alkyl group, an optionally substituted (hetero)cyclic alkyl group, an optionally substituted (hetero)aryl group, an optionally substituted aralkyl group, an optionally substituted alkoxy group, an optionally substituted (hetero)cyclic alkoxy group, or an optionally substituted (hetero)aryl group; R2, R4 and R5 independently represent an optionally substituted alkyl, an optionally substituted (hetero)cyclic alkyl group or an optionally substituted aralkyl group; and R1 and R2, R4 and R5, R3 and R4, and R3 and R5 may represent the necessary atoms to form a ring.

Colour laser markable articles

A negative-working lithographic printing plate precursor includes a support and a coating containing a photopolymerizable layer including a polymerizable compound including: 

A negative-working lithographic printing plate precursor includes a support and a coating containing a photopolymerisable layer; characterized in that the coating includes a compound including at least one moiety having a structure according to Formula (I) at a level above 10% wt and below 40% wt relative to the total dry weight of the ingredients of the coating: 

A negative-working lithographic printing plate precursor includes a coating containing a photopolymerizable layer and optionally an intermediate layer between the photopolymerizable layer and the support, wherein the coating further includes a polysiloxane, the polysiloxane being present in the photopolymerizable layer and/or in the optional intermediate layer, and the polysiloxane is obtained by reacting at least one organosilicon compound represented by the general Formula (I) and at least one organosilicon compound represented by the general Formula (II): 

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Mortsel, Belgium

Marin Steenackers