Abstract: A toner comprising toner particles having at least one type of surface additive, the toner particles having an FPIA average circularity of at least 0.95, whereby at least 80% wt of the total amount of surface additives stays onto the surface of the toner particles when an ultrasonic treatment of 4500 to 4700 J/gram of toner is applied; a substrate printed or marked with the above-described toner; and a method for manufacturing a toner, said method including the steps of: mixing a binder resin, a colorant and optionally other additives, thereby forming a mixture, melting, kneading and milling said mixture, thereby obtaining a melted kneaded product, pulverizing said melted kneaded product, adding at least one surface additive before or while bringing the FPIA average circularity of said toner particles to 0.

Abstract: A radiation curable toner is described having at least a radiation curable binder (e.g. a UV curable polymer), a photoinitiator, and a wax; wherein the wax is present in a concentration ranging from 0.3 to 3% by weight. The ratio of scratch resistance before curing is preferably at least 2. The toner may be used in a developer, e.g. a two-component developer, for printing or copying.

Abstract: A toner comprising toner particles having at least one type of surface additive, the toner particles having an FPIA average circularity of at least 0.95, whereby at least 80% wt of the total amount of surface additives stays onto the surface of the toner particles when an ultrasonic treatment of 4500 to 4700 J/gram of toner is applied; a substrate printed or marked with the above-described toner; and a method for manufacturing a toner, said method including the steps of: mixing a binder resin, a colorant and optionally other additives, thereby forming a mixture, melting, kneading and milling said mixture, thereby obtaining a melted kneaded product, pulverizing said melted kneaded product, adding at least one surface additive before or while bringing the FPIA average circularity of said toner particles to 0.

Abstract: The present invention provides dry toner particles comprising at least a radiation curable resin, and a colouring agent, wherein the circularity of the toner particles is between 0.95 and 0.99 and a charge control agent in a concentration between 0.025% and 1.0% by weight is present preferably as an external additive. The toners of this invention are useful for printing any substrate and for use in any form of printing or marking device.

Abstract: A toner comprising toner particles having at least one type of surface additive, the toner particles having an FPIA average circularity of at least 0.95, whereby at least 80 % wt of the total amount of surface additives stays onto the surface of the toner particles when an ultrasonic treatment of 4500 to 4700 J/gram of toner is applied; a substrate printed or marked with the above-described toner; and a method for manufacturing a toner, said method including the steps of: mixing a binder resin, a colorant and optionally other additives, thereby forming a mixture, melting, kneading and milling said mixture, thereby obtaining a melted kneaded product, pulverizing said melted kneaded product, adding at least one surface additive before or while bringing the FPIA average circularity of said toner particles to 0.

Abstract: A radiation curable toner is described comprising at least a radiation curable binder (e.g. a UV curable polymer), a photoinitiator, and a wax; wherein the wax is present in a concentration ranging from 0.3 to 3% by weight. The ratio of scratch resistance after curing to scratch resistance before curing is preferably at least 2. The toner may be used in a developer, e.g. a two-component developer, for printing or copying.

Abstract: The present invention provides dry toner particles comprising at least a radiation curable resin, and a colouring agent, wherein the circularity of the toner particles is between 0.95 and 0.99 and a charge control agent in a concentration between 0.025% and 1.0% by weight is present preferably as an external additive. The toners of this invention are useful for printing any substrate and for use in any form of printing or marking device.

Abstract: A toner particles supplying device includes a pneumatic conveyor and a rotatable container or a container with a rotatable inner structure including machinery for tumbling the toner particles. The machinery for tumbling the toner particles is located on or near an inner surface of the container and serves for fluidising toner particles and urging them toward the pneumatic conveyor.

Abstract: The invention relates to dry toner particles comprising at least a radiation curable resin and a colouring agent, the radiation curable resin comprises a blend of a) an (meth)acrylated epoxy/polyester resin b) (meth)acrylated polyurethane resin. Preferably, when fused and cured toner images obtainable from said dry toner particles are obtained on a substrate used for developing same, these images have an equivalent rub number (ERN)>6, wherein ERN=MEK rub resistance/(radiation dose*meq/gr), wherein meq/gr designates the milli-equivalent amount of double bounds per gram of said radiation curable resin and a viscosity behaviour such that the viscosity at 140° C. is lower than the viscosity at 120° C.

Abstract: A toner composition is provided wherein by adding aliphatic lower molecular weight compounds which are partly or completely compatible with the binder resin(s), the melt viscosity of the toner composition can be lowered while the glass transition temperature (Tg) is more or less constant. Inclusion of these adding aliphatic lower molecular weight compounds, having a number average molecular weight, as measured by GPC in toluene, of from 500 to 3,000, results in toner compositions with a better adhesion and gloss and still an acceptable level of FOT and hot-offset. Also provide is a method for fixing toner images on a substrate.

Abstract: A method is disclosed for verifying the printing quality of a lithographic printing plate which is obtained by a plate-making process whereby an ink-receptive silver image is formed at the printing areas, characterized in that said method comprises the step of matching the color of the silver image of said plate with a plurality of reference colors contained in a color reference system that provides information regarding the quality of silver-based lithographic printing plates having said reference colors. The color reference system may also provide information regarding the parameter(s) of the plate-making process so that said parameter(s) can be adjusted in order to improve the quality of the plates obtained by said process.

Abstract: A lithographic printing plate that works according to the silver salt diffusion transfer reversal process is disclosed. The lithographic properties of said plate can be improved by incorporating a hydrophilic amphoteric block copolymer, comprising a non-ionic block of acrylic units with pendant nitrile groups and an acrylamid(in)e block which comprises units with pendant basic and acidic groups. The hydrophilic amphoteric block copolymer is preferentially present in the image receiving layer of the lithographic printing plate. In an alternative embodiment, said block copolymer may be present in a treating solution used for processing said plate or applied onto said plate while printing. The hydrophilicity of the printing plate's surface is improved without deteriorating the ink-acceptance in the printing areas.

Abstract: The present invention provides a correcting liquid for silver imaged lithographic printing plates being an aqueous solution having a pH in the range between 5.5 and 8.5 and comprising a iron (III) complex salt of an organic acid, a sulphite or a metabisulphite, a silver halide solvent and an accelerator, said accelerator being an organic heterocyclic compound having a mercapto- or thione group and not having a hydrophilic substituent besides the said mercapto or thione group characterized in that said accelerator is present in an amount ranging from 0.04 to 0.4 mole per liter of correcting liquid.

Abstract: A kit for preparing a processing liquid for use in the preparation of a lithographic printing plate according to the silver salt diffusion transfer process, and comprising all necessary active compounds for preparing said processing liquid, said active compounds including a hydrophobizing agent, said hydrophobizing agent being provided in a concentrated dissolved liquid state.

Abstract: The present invention provides an imaging element comprising on a support in the order given (i) a base layer comprising a binder in an amount between 1 and 4 g/m.sup.2, (ii) a photosensitive layer comprising a spectrally sensitised silver halide emulsion, and (iii) a receiving layer containing physical development nuclei in water permeable relationship with said photosensitive layer, characterized in that the base layer contains a latex polymer or copolymer with a glass transition temperature Tg not higher than 40.degree. C.

Abstract: The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the steps of:image-wise exposing an imaging element comprising on a support a photosensitive layer comprising a silver halide emulsion and an image receiving layer containing physical development nuclei,developing said imaging element in the presence of developing agent(s) and silver halide solvent(s) using an alkaline processing liquid andneutralizing a thus obtained developed imaging element using a neutralization solution having a pH between 4 and 10.5 and comprising a hydrophobizing agent and a buffer characterized in that said neutralization solution comprises a salt of sulfurous acid.

Abstract: The present invention provides a kit of parts for preparing an alkaline processing liquid for use in preparing a lithographic printing plate according to the silver salt diffusion transfer process, and comprising all necessary active compounds for preparing said alkaline processing liquid, said active compounds being comprised in parts physically separated from each other, at least one of said parts comprising an inorganic alkali in solid form, at least one of said parts comprising an alkanolamine as silver halide solvent and at least one of said other parts comprising a hydrophobizing agent and being substantially free from inorganic and/or organic alkali.

Abstract: The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the steps of:image-wise exposing an imaging element comprising on a support a photosensitive layer comprising a silver halide emulsion and an image receiving layer containing physical development nuclei,developing said imaging element in the presence of at least one developing agent and at least one silver halide solvent using an alkaline processing liquid andneutralizing a thus obtained developed imaging element using a neutralization solution having a pH between 4 and 10.5 and comprising a buffer characterized in that said neutralization solution comprises 2-methyl-3(2H)-isothiazolone.

Abstract: The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the following steps:image-wise exposing with a high intensity-short time exposure with light with a wavelength between 600 nm and 700 nm an imaging element comprising on a support (1) a photosensitive layer comprising at least one photosensitive silver halide emulsion sensitized to light by means of one or more cationic carbocyanine sensitizing dye having a maximum absorption between 600 nm and 700 nm, the silver halide crystals of said silver halide emulsion comprising more than 95 mole % of silver chloride per mole of silver halide and (2) an image receiving layer comprising physical development nuclei in a water permeable relationship with said photosensitive layer,developing said imaging element using an alkaline processing liquid in the presence of (a) developing agent(s) and (a) silver halide solvent(s),characterized in that said silver halide crystals conta

Abstract: According to the present invention, a method is provided for preparing physical development nuclei for use in silver salt diffusion transfer processing, said physical development nuclei comprising a heavy metal sulphide, said method comprising the steps of:precipitating said heavy metal sulphide by bringing a water soluble heavy metal compound in reactive association with a water soluble sulphide in an aqueous liquid andsaid precipitation being carried out in the presence of a hydrophilic polymer so as to disperse said heavy metal sulphide, said hydrophilic polymer comprising a heterocyclic group, characterized in that said heterocyclic group is present in a recurring unit of said hydrophilic polymer, said recurring unit being comprised in said polymer in an amount between 0.1 mol % and 5 mol %.