Agfa Patente

A UV curable composition containing a mixture of free radical polymerizable monomers and a APO photoinitiator according to formula (I): <img class="EMIRef" id="5f39f83d-299c-4f56-81e0-bb8b15c82811-ia01" /> wherein R1 is selected from the group consisting of an alkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an alkaryl group and an aryl group or a heteroaryl group; R2 and R3 are independently selected from an alkyl group and an alkoxy group; R4 is selected from a hydrogen, an alkyl group and an alkoxy group; X and Y are independently selected from an oxygen atom, a methylene group, a - C(=CH2)- group, and a carbon atom present in a group selected from a straight chain alkylene group, an alkenylene group, an arylene group, a heteroarylene group and a cycloalkylene group; L represents a divalent linking group selected from the group consisting of an unsubstituted alkylene group, an arylene group, a heteroarylene group, a cycloalkylene group, a substituted alkylene group substituted by one or more ether groups, a substituted alkylene group substituted by one or more substituents selected from the group consisting of an aryl group, a heteroaryl group, an arylene group, a heteroarylene group, a cycloalkylene group, an ester group, an amide group, an amine group, an ether group, a thioether group, a ketone group, an aldehyde group, a sulfoxide group, a sulfone group, a sulfonate ester group, a sulphonamide group, -Cl, -Br, -I, -OH, - SH, -CN and -NO<2>; and wherein the UV curable composition is free of a photoinitiator including 2 monoacyl phosphine oxide moieties linked to each other via their acyl group and wherein the 2 monoacyl phosphine oxide moieties have a chemical structure differing in the phosphine oxide part. Cured products and inkjet printing methods with the radiation curable compositions are also disclosed.

An image recording method comprising the following steps: i) applying an aqueous pre-treatment liquid onto at least a part of a recording region S of a surface of a substrate; and ii) attaching an aqueous inkjet ink onto at least a part of the recording region S, the aqueous inkjet ink comprises indigo pigment particles selected from a synthetic process or a bio-based process, a polymeric dispersant and a water-soluble organic solvent, the indigo pigment particles have an average particle size equal to 30 nm or more and equal to 1000 nm or less, the polymeric dispersant is a block co-polymer having an average molecular weight equal to 1.2 kDa or more and comprises a hydrophobic block and a hydrophilic block. An ink set containing the aqueous inkjet ink comprising indigo pigment particles selected from a bio-based process, a polymeric dispersant and a water-soluble organic solvent is also provided.

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A lithographic printing plate precursor is disclosed including a support and a coating comprising (i) a photopolymerisable layer including a polymerisable compound and a photoinitiator, and a toplayer provided above the photopolymerisable layer;characterized in that the toplayer includes a halogenated polymer and a nitrite and/or nitrate salt.

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A drive circuit for charging a printhead for ejecting drops of ink is provided, the printhead having a capacitance. The drive circuit comprises a power supply comprising a first connection and a second connection. An inductor is connected to the first connection of the power supply, wherein the inductor is connected to a first drive connection of the printhead to provide a charge path for current to charge the capacitance. The second connection of the power supply is connected to a second drive connection of the printhead. The drive circuit also comprises means for applying a plurality of charging voltage pulses to the inductor to provide a single charge of the capacitance for a single cycle of ink ejection from the printhead. A method of operating the drive circuit is also provided.

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An ink set for manufacturing decorative laminates including pigmented free radical curable inkjet inks and a free radical curable liquid, wherein the pigmented free radical curable inkjet inks include a colour pigment and a polymerizable composition containing 10 to 90 wt% of one or more monofunctional polymerizable compounds; wherein the free radical curable liquid includes a polymerizable composition containing 15 wt% or more of polyfunctional polymerizable compounds and 15 wt% or more of a specific monofunctional polymerizable compound; and wherein all weight percentages wt% are based upon the total weight of the polymerizable composition in the pigmented free radical curable inkjet ink or the polymerizable composition in the free radical curable liquid;

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An acyl phosphine oxide photoinitiator having an ether group, a hydroxy group or a tertiary amine group connected via a carbon chain of 1 to 3 carbon atoms to an amide group on the acyl group of a monoacyl phosphine oxide moiety. The use of the acyl phosphine oxide photoinitiator in photocurable compositions and UV curable inkjet inks is also disclosed.

A photoinitiator including 2 to 6 monoacyl phosphine oxide moieties characterized in that the monoacyl phosphine oxide moieties are linked to each other via their acyl group and that at least 2 monoacyl phosphine oxide moieties have a chemical structure differing in the phosphine oxide part.

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A multi-scale image processing algorithm for enhancing contrast in an electronic representation of an image represented by a) decomposing said digital image into a set of detail images at multiple resolution levels and a residual image at a resolution level lower than said multiple resolution levels, b) processing at least one pixel of said detail images, c) computing a processed image by applying a reconstruction algorithm to the residual image and the processed detail images, said reconstruction algorithm being such that if it were applied to the residual image and the detail images without processing, then said digital image or a close approximation thereof would be obtained. The processing comprises the steps of: d) calculating for said pixel, at least one statistical measure for two or more translation difference image pixel values within a neighbourhood of said pixel; and e) modifying the value of said pixel of said detail images as a function of said statistical measure and said value of said pixel of said detail images.

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