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: 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 &mgr;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

Abstract: A photopolymerizable printing plate has a dimensionally stable support, a photopolymerizable layer, a top layer located thereon comprising two mutually incompatible, elastomeric block copolymers, and a protective sheet. Disclosed are processes for producing such a photopolymerizable printing plate, processes for producing relief printing plates, especially flexographic printing plates, and also relief printing plates having ink cells in the relief surface.

Abstract: A photosensitive mixture useful for producing relief and printing plates consists essentially of(a) at least one block copolymer of styrene, butadiene and/or isoprene,(b) at least one photopolymerizable olefinically at least monounsaturated organic compound,(c) at least one photoinitiator, and(d) at least one azo dye.

Abstract: A photosensitive recording element comprises(A) a dimensionally stable substrate,(B) a photopolymerizable relief-forming recording layer and, if required, an adhesion-promoting layer arranged between (A) and (B), a release layer (C) applied to that side of the recording layer (B) which faces away from the substrate (A), and, if required, a cover sheet (D) applied thereon, the photopolymerizable relief-forming recording layer (B) containingb.sub.1) at least one polymeric binder,b.sub.2) at least one photopolymerizable olefinically unsaturated monomer which is compatible with b.sub.1),b.sub.3) at least one photopolymerization initiator andb.sub.4) at least one aryl alkyl ketone,and is suitable for the production of relief printing plates.

Abstract: A reaction product useful for preparing radiation-sensitive materials, in particular materials whose solubility in water or aqueous alkali increases on irradiation, contains urea and urethane groups and also carboxyl groups and is obtained by reaction ofi) an ethylenically monounsaturated or polyunsaturated mono- or polyalcohol withii) a di- or polyisocyanate,iii) at least one amino compound andiv) at least one anhydride of an at least dibasic carboxylic acid,the number of NCO and anhydride groups in ii) and iv) being equal to or less than the number of groups in i) and iii) which are reactive therewith.