Abstract: The invention relates to a radiation-curable mixture for generating relief structures, comprising a) at least one functionalized, part-hydrolyzed polyvinyl acetate comprising (i) vinyl alcohol units, (ii) vinyl acetate units, and (iii) vinyl acrylate units, where the vinyl acrylate units, which can be substituted, have the general structure where R is hydrogen or a linear or branched aliphatic or heteroaliphatic radical having 1 to 12 carbon atoms, or a cycloaliphatic, heterocyclic or aromatic radical having 3 to 12 carbon atoms, as component A, b) at least one initiator as component B, c) at least one ethylenically unsaturated compound different from component A, as component C, d) one or more adjuvants as component D, wherein the amount of vinyl acrylate units (iii) in the functionalized, part-hydrolyzed polyvinyl acetate a), based on all the units (i), (ii), and (iii), is 0.1 to <3 mol %, and component D comprises an additive capable of hydrogen bonding, in an amount of 0.

Abstract: A method for the production of functionalized partially hydrolyzed polyvinyl acetate comprising vinyl alcohol, vinylacetate and functionalized vinyl alcohol units by reacting in a melt a partially hydrolyzed polyvinyl acetate as component A with a reactive compound carrying at least one ethylenically unsaturated group and at least one reactive group reactive with hydroxyl or acetate groups as component B, in the presence of at least one stabilizer as component C and in the presence of at least one catalyst selected from the group consisting of tertiary amines and nitrogen-containing heterocycles as component D, the method comprising the steps: feeding the components into a mixing device capable of heating, melting and mixing components A, B, C and D, heating, melting and mixing components A, B, C and D in the device to give a melt and reacting components A and B in the melt.

Abstract: The invention relates to a process for the production of relief printing plates, where a carrier with a polymeric substrate layer is provided and a relief is formed layer-by-layer on a surface of the substrate layer, where the relief is formed by means of a) single or multiple application of a liquid comprising at least one reactive monomer to the surface of the substrate layer, b) diffusion of the reactive monomer into the polymeric substrate layer for a prescribed exposure time and c) hardening of the relief, where in step a) the liquid is applied in accordance with an image to the surface and where, after the prescribed exposure time of step b), any liquid that remains on the surface, having not diffused into the material, is removed from the surface, and in step c) the relief that is hardened comprises the polymer of the substrate layer and reactive monomer that has diffused into the material.

Abstract: The invention relates to a method for producing pictorial relief structures on a layer construction. The method comprises the provision of a layer construction having a substrate layer. After this, at least one fluid containing at least one first reactive component is applied pictorially to the substrate, wherein the pictorial application takes place in the form of a plurality of droplets with a droplet volume of less than 2 ?l, and wherein the droplets are positioned pictorially. After this, there is an at least partial diffusing of the at least one first reactive component into the substrate layer for a predefined exposure time and/or an at least partial diffusing of at least one second reactive component into the pictorially positioned droplets of fluid for a predefined exposure time, wherein the substrate layer comprises the at least one second reactive component.

Abstract: The invention relates to a method for generative production of relief printing plates, wherein a support with a polymeric substrate layer and a laser-ablatable mask layer is provided, the polymeric substrate layer containing a first binder. A mask with openings corresponding to pixels is produced by imagewise laser ablation of the mask layer. A liquid containing a reactive monomer is then applied over the surface of the mask-covered polymeric substrate layer, and the liquid or the reactive monomer diffuses through the openings of the mask into the polymeric substrate layer for a defined exposure time so as to form a relief. The excess liquid or the excess monomer and optionally the mask are removed from the surface, and the resulting relief is fixed by crosslinking.

Abstract: A method for the production of functionalized partially hydrolyzed polyvinyl acetate comprising vinyl alcohol, vinyl acetate and functionalized vinyl alcohol units by reacting in a melt a partially hydrolyzed polyvinyl acetate as component A with a reactive compound carrying at least one ethylenically unsaturated group and at least one reactive group reactive with hydroxyl or acetate groups as component B, in the presence of at least one stabilizer as component C and in the presence of at least one catalyst selected from the group consisting of tertiary amines and nitrogen-containing heterocycles as component D, the method comprising the steps: a) optionally drying one or more of components A, B, C and optionally D, b) optionally pre-mixing two or more of components A, B, C and optionally D, c) feeding the components into a mixing device capable of heating, melting and mixing components A, B, C and D, d) heating, melting and mixing components A, B, C and D in the device to give a melt and reacting components

Abstract: The invention relates to a method for producing pictorial relief structures on a layer construction. The method comprises the provision of a layer construction having a substrate layer. After this, at least one fluid containing at least one first reactive component is applied pictorially to the substrate, wherein the pictorial application takes place in the form of a plurality of droplets with a droplet volume of less than 2 ?l, and wherein the droplets are positioned pictorially. After this, there is an at least partial diffusing of the at least one first reactive component into the substrate layer for a predefined exposure time and/or an at least partial diffusing of at least one second reactive component into the pictorially positioned droplets of fluid for a predefined exposure time, wherein the substrate layer comprises the at least one second reactive component.

Abstract: The invention relates to a radiation-curable mixture for generating relief structures, comprising a) at least one functionalized, part-hydrolyzed polyvinyl acetate comprising (i) vinyl alcohol units, (ii) vinyl acetate units, and (iii) vinyl acrylate units, where the vinyl acrylate units, which can be substituted, have the general structure where R is hydrogen or a linear or branched aliphatic or heteroaliphatic radical having 1 to 12 carbon atoms, or a cycloaliphatic, heterocyclic or aromatic radical having 3 to 12 carbon atoms, as component A, b) at least one initiator as component B, c) at least one ethylenically unsaturated compound different from component A, as component C, d) one or more adjuvants as component D, wherein the amount of vinyl acrylate units (iii) in the functionalized, part-hydrolyzed polyvinyl acetate a), based on all the units (i), (ii), and (iii), is 0.1 to <3 mol %, and component D comprises an additive capable of hydrogen bonding, in an amount of 0.

Abstract: The invention relates to a method for generative production of relief printing plates, wherein a support with a polymeric substrate layer and a laser-ablatable mask layer is provided, the polymeric substrate layer containing a first binder. A mask with openings corresponding to pixels is produced by imagewise laser ablation of the mask layer. A liquid containing a reactive monomer is then applied over the surface of the mask-covered polymeric substrate layer, and the liquid or the reactive monomer diffuses through the openings of the mask into the polymeric substrate layer for a defined exposure time so as to form a relief. The excess liquid or the excess monomer and optionally the mask are removed from the surface, and the resulting relief is fixed by crosslinking.

Abstract: The invention relates to a process for the production of relief printing plates, where a carrier with a polymeric substrate layer is provided and a relief is formed layer-by-layer on a surface of the substrate layer, where the relief is formed by means of a) single or multiple application of a liquid comprising at least one reactive monomer to the surface of the substrate layer, b) diffusion of the reactive monomer into the polymeric substrate layer for a prescribed exposure time and c) hardening of the relief, where in step a) the liquid is applied in accordance with an image to the surface and where, after the prescribed exposure time of step b), any liquid that remains on the surface, having not diffused into the material, is removed from the surface, and in step c) the relief that is hardened comprises the polymer of the substrate layer and reactive monomer that has diffused into the material.

Abstract: A process for the manufacture of organically developable, photopolymerizable flexographic elements on flexible metallic supports by coating a flexible metallic support with a tack-free adhesive coating composition which is insoluble and non-swelling in printing inks and organic developers, attaching an elastomeric, photopolymerizable layer to a protective film, and laminating the photopolymerizable layer to the metallic support coated with said adhesive coating composition. A photopolymerizable flexographic element comprising a photopolymerizable layer which is attached to a metallic support by means of a tack-free adhesive film that is non-swelling and insoluble in printing inks and organic developers.

Abstract: The invention relates to photopolymerizable flexographic printing elements which contain ethylenically unsaturated, alicyclic monomers and hard flexographic printing plates, in particular cylindrical continuous seamless flexographic printing plates, which can be produced therefrom.

Abstract: The invention relates to photopolymerizable flexographic printing elements which contain ethylenically unsaturated, alicyclic monomers and hard flexographic printing plates, in particular cylindrical continuous seamless flexographic printing plates, which can be produced therefrom.

Abstract: Laser-engravable flexographic printing elements for the production of flexographic printing plates have relief layers comprising blends of hydrophilic polymers and hydrophobic elastomers. Said flexographic printing elements are used for the production of flexographic printing plates by means of laser engraving.

Abstract: The present invention relates to a photosensitive flexographic printing element for the production of flexographic newspaper printing plates, comprising at least a flexible, metallic support, an adhesive layer applied thereto, a photopolymerizable layer which can be developed in organic media and which itself comprises at least one elastomeric binder, ethylenically unsaturated monomers, a photoinitiator or photoinitiator system and a plasticizer, a transparent substrate layer, and optionally a removable protective film, where the total thickness of the flexographic printing element is from 300 to 1000 ?m, the elastomeric binder has a weight average molecular weight Mw of from 80,000 to 150,000 g/mol and a Shore A hardness of from 50 to 80, and the amount of plasticizer is from 5 to 50% by weight, based on the amount of all constituents of the photopolymerizable layer, and to a process for the production of flexographic newspaper printing plates by imagewise exposure of the flexographic printing element to act

Abstract: In a laser-engravable flexographic printing element, the relief-forming layer comprises a conductivity carbon black having a specific surface area of at least 150 m2/g and a DBP number of at least 150 ml/100 g. Flexographic printing plates are produced by a process in which a printing relief is engraved into said flexographic printing element by means of a laser system.

Abstract: An apparatus for the in-line production of flexographic printing plates by means of digital imaging is used for the production of newspaper flexographic printing plates.

Abstract: A process for the manufacture of organically developable, photopolymerizable flexographic elements on flexible metallic supports by coating a flexible metallic support with a tack-free adhesive coating composition which is insoluble and non-swelling in printing inks and organic developers, attaching an elastomeric, photopolymerizable layer to a protective film, and laminating the photopolymerizable layer to the metallic support coated with said adhesive coating composition. A photopolymerizable flexographic element comprising a photopolymerizable layer which is attached to a metallic support by means of a tack-free adhesive film that is non-swelling and insoluble in printing inks and organic developers.

Abstract: A process for the manufacture of organically developable, photopolymerizable flexographic elements on flexible metallic supports by coating a flexible metallic support with a tack-free adhesive coating composition which is insoluble and non-swelling in printing inks and organic developers, attaching an elastomeric, photopolymerizable layer to a protective film, and laminating the photopolymerizable layer to the metallic support coated with said adhesive coating composition. A photopolymerizable flexographic element comprising a photopolymerizable layer which is attached to a metallic support by means of a tack-free adhesive film that is non-swelling and insoluble in printing inks and organic developers.

Abstract: The invention relates to a method for producing laser-engravable flexographic printing elements on flexible metallic supports comprising a cross-linked elastomeric layer and an absorber for laser radiation. The invention also relates to a method for producing flexographic printing plates by means of laser engraving using flexographic printing elements of the aforementioned type, and to flexographic printing plates produced using such a method.