Abstract: The present invention refers to a process for the preparation of an ?-functionalized ketone, an ?-functionalized ketone obtained by said process, a photopolymerizable composition comprising the ?-functionalized ketone and at least one photopolymerizable unsaturated compound, a method of preparing an article, an article obtained by said method, as well as the use of the ?-functionalized ketone or the photopolymerizable composition as photoinitiator.

Abstract: The invention concerns the use of monomer-free, saturated and unsaturated polyester resins, or mixtures of saturated and unsaturated polyester resins, containing structural units of the general formulae (I) and/or (II), in which n =1-10, as low-emission binders for coatings.

Abstract: Photopolymeric letterpress printing plates which are to be developed with water or water/alcohol mixtures after imagewise exposure and have, arranged one on top of the other on a dimensionally stable substrate, a layer (A) which may be bonded to the dimensionally stable substrate by an adhesion-promoting layer and is crosslinkable by actinic radiation, a layer (B) which is sensitive to IR radiation and, if required, a parting layer arranged between layer (A) and layer (B), and a peelable protective film applied to the layer (B), are produced by a process in which the layer (A) contains a mixture of at least one polymeric binder which is soluble or dispersible in water or water/alcohol mixtures, copolymerizable ethylenically unsaturated organic compounds which are compatible with the polymeric binder and a photoinitiator, the layer (B) sensitive to IR radiation has an optical density ≧2.

Abstract: Photopolymeric gravure printing plates which are to be developed with water or water/alcohol mixtures after imagewise exposure and have, arranged one on top of the other on a dimensionally stable substrate, a layer (A) which may be bonded to the dimensionally stable substrate by an adhesion-promoting layer and is crosslinkable by actinic radiation, a layer (B) which is sensitive to IR radiation and, if required, a parting layer arranged between layer (A) and layer (B), and a peelable protective film applied to the layer (B), are produced by a process in which the layer (A) consists of a mixture of at least one polymeric binder which is soluble or dispersible in water or water/alcohol mixtures, copolymerizable ethylenically unsaturated organic compounds which are compatible with this polymeric binder, a photoinitiator or photoinitiator system and, if required, further assistants, the parting layer which may be arranged between layer (A) and layer (B) is oxygen-permeable and the layer (B) sensitive to IR radiat

Abstract: The invention relates to solvent-free coating compositions which can be cured with low emissions and comprise, as binders, saturated and/or unsaturated polyesters whose structural units include dihydrodicyclopentadiene units of the formula (I): ##STR1## and/or oligodihydrodicyclopentadiene units of the formula (II): ##STR2## where n=1 to 10, to processes for the production of coatings using the novel coating compositions, and to the use of the coating compositions for coating metal containers, especially cans.

Abstract: The invention concerns the use of monomer-free saturated or unsaturated polyester resins or mixtures of saturated and unsaturated polyester resins containing structural units of general formulae (I) and/or (II), in which n=1-10, as impregnation, sealing and coating compounds for electrical engineering and electronic components and for carrier substances for flat insulating materials.

Abstract: The invention relates to the use of reactive prepolymeric organic compounds, containing structural units having at least one readily abstractable hydrogen with a bond energy of not more than 397 kJ/-mol and having at least one ethylenic double bond, for crosslinking, with or without free-radical initiators, by means of heat, high-energy radiation or heat and high-energy radiation.

Abstract: A multilayer recording element is suitable for the production of flexographic printing plates by digital information transfer and has, arranged one on top of the other on a dimensionally stable substrate, a layer (A) crosslinkable by actinic radiation, a layer (B) sensitive to IR radiation and, if required, a peelable cover sheet, the layer (A) crosslinkable by actinic radiation being capable of being washed out by means of a developer after imagewise exposure and consisting essentially of a mixture of at least one elastomeric binder, ethylenically unsaturated copolymerizable organic compounds, a photoinitiator and, if required, further assistants, and the layer (B) sensitive to IR radiation being a layer which is soluble or dispersible in the developer and contains, in a film-forming binder having elastomeric character, at least one finely divided substance which has a high absorbance in the wavelength range from 750 to 20,000 nm.

Abstract: Photopolymeric letterpress printing plates which are to be developed with water or water/alcohol mixtures after imagewise exposure and have, arranged one on top of the other on a dimensionally stable substrate, a layer (A) which may be bonded to the dimensionally stable substrate by an adhesion-promoting layer and is crosslinkable by actinic radiation, a layer (B) which is sensitive to IR radiation and, if required, a parting layer arranged between layer (A) and layer (B), and a peelable protective film applied to the layer (B), are produced by a process in which the layer (A) contains a mixture of at least one polymeric binder which is soluble or dispersible in water or water/alcohol mixtures, copolymerizable ethylenically unsaturated organic compounds which are compatible with the polymeric binder and a photoinitiator, the layer (B) sensitive to IR radiation has an optical density.gtoreq.2.

Abstract: Photopolymeric gravure printing plates which are to be developed with water or water/alcohol mixtures after imagewise exposure and have, arranged one on top of the other on a dimensionally stable substrate, a layer (A) which may be bonded to the dimensionally stable substrate by an adhesion-promoting layer and is crosslinkable by actinic radiation, a layer (B) which is sensitive to IR radiation and, if required, a parting layer arranged between layer (A) and layer (B), and a peelable protective film applied to the layer (B), are produced by a process in which the layer (A) consists of a mixture of at least one polymeric binder which is soluble or dispersible in water or water/alcohol mixtures, copolymerizable ethylenically unsaturated organic compounds which are compatible with this polymeric binder, a photoinitiator or photoinitiator system and, if required, further assistants, the parting layer which may be arranged between layer (A) and layer (B) is oxygen-permeable and the layer (B) sensitive to IR radiat

Abstract: In a multilayer recording element which is suitable for producing flexographic printing plates by digital information transfer and has, arranged one on top of the other on a dimensionally stable substrate, a layer (A) which is crosslinkable by actinic radiation, a layer (B) sensitive to actinic radiation and, if required, a peelable cover sheet, the layer (A) crosslinkable by actinic radiation is crosslinked by imagewise exposure to actinic radiation of from 0.5 to 5 J/cm.sup.2 and can then be washed out by a developer and essentially comprises a mixture of at least one elastomeric binder, ethylenically unsaturated copolymerizable organic compounds, photoinitiator, and, if required, further assistants, and the layer (B) sensitive to actinic radiation is a layer which is soluble or dispersible in developers and has an optical density of >2.

Abstract: (A) being a photosensitive relief-forming layer in which imagewise exposure to actinic light results in different solubilities of the exposed and unexposed parts, and this layer consists of a mixture of:(a1)one or more polymeric binders,(a2)one or more photopolymerization initiators,(a3)one or more organic compounds which are compatible with the binder (a1) and contain photopolymerizable olefinically unsaturated groups and, if required,(a4)one or more assistants,(B) being a smooth or dull, nontacky release layer (B) which is transparent to light, soluble or swellable in the relevant liquid media and formed by a polymer forming strong films and additives contained therein, and(C) being a cover sheet which can be detached from the release layer (B), the release layer (B) containing a metal salt as an additive,is suitable for the production of printing plates.

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: For the production of a recording element having a photopolymerizable recording layer comprising at least two individual layers having the same composition or different compositions, located one on top of the other and firmly bonded to one another, the components used for the production of the individual layers are melted together, homogeneously mixed and freed from gaseous constituents in a self-purging, twin-screw extruder. Thereafter, the component mixture is divided into two or more material streams in a manner such that at least one material stream is removed from the extruder, transported by means of a delivery pump to an adapter or to a multilayer die and bonded there with a material stream from the screw extruder after shaping in each case to give sheet-like structures. During transport of the separate material streams, further components may be metered into or mixed with said streams, so that individual layers having the same or different properties are obtained.

Abstract: Storage-stable solutions of film forming carboxyl-containing copolymers, from 5 to 80% of whose carboxyl groups have been reacted with glycidyl (meth)acrylate, in an inert organic solvent or solvent mixture additionally contain a phosphoric ester of a hydroxyalkyl (meth)acrylate and, if required, orthophosphoric acid, and photosensitive coatings which contain a photoinitiator, ethylenically unsaturated organic monomeric compounds which can be subjected to free radical polymerization and, if required, plasticizers, dyes, dye precursors and thermal polymerization inhibitors are produced in such storage-stable solutions.They are particularly suitable for the production of offset printing plates.

Abstract: In novel polyethyleneimine and polyvinylamine derivatives, the polyethyleneimines contain the structural elements Ia and/or Ib ##STR1## and the polyvinylamines contain the structural elements II.sub.a, II.sub.b and II.sub.c ##STR2## where, for the degrees of polymerization n, m and p, n.gtoreq.1, m.gtoreq.0 and p.gtoreq.0, and X.sup.1 is CR.sup.1 R.sup.2 PO.sub.3 R.sup.3 R.sup.4 or CR.sup.1 R.sup.2 SO.sub.3 R.sup.3, X.sup.2 independently of X.sup.1 is hydrogen, CR.sup.1 R.sup.2 PO.sub.3 R.sup.3 R.sup.4 or CR.sup.1 R.sup.2 SO.sub.3 R.sup.3, Y.sup.1 and Y.sup.2 independently of one another are each one or more CHR.sup.1 PO.sub.3 R.sup.3 R.sup.4 or CHR.sup.1 SO.sub.3 R.sup.3 groups or hydrogen, Y.sup.3 and Y.sup.4 independently of one another and of Y.sup.1 and Y.sup.2 are each hydrogen, CHR.sup.1 PO.sub.3 R.sup.3 R.sup.4 or CHR.sup.1 SO.sub.3 R.sup.3, and Z.sup.1 -Z.sup.4 are identical or different inorganic and/or organic radicals, wherein R.sup.1 and R.sup.2 independently of one another are each hydrogen, C.

Abstract: A sensitized lithographic printing plate comprising an aluminum substrate which has been mechanically, chemically and/or electrochemically pretreated and anodically oxidized in a conventional manner and a photosensitive copying layer which is applied to this substrate is produced by a process in which the substrate is aftertreated with an aqueous solution of a mixture of a fluoride and a hydrolysis product or condensate of a silane before application of the photosensitive copying layer.There lithographic printing plates are particularly suitable for offset printing.

Abstract: A sensitized lithographic printing plate is produced from an aluminum base which has been mechanically, chemically and/or electrochemically pretreated and anodically oxidized in a conventional manner and a photosensitive copying layer which is applied to this base, by a process in which a thin layer which imparts hydrophilic properties and consists of a hydrolysis product or condensate of one or more silanes is applied between the base and the copying layer.These lithographic printing plates are particularly useful for offset printing.

Abstract: Hexaarylbisimidazoles I ##STR1## where Ar.sup.1, Ar.sup.2 and Ar.sup.3 are each aryl, of which Ar.sup.2 and Ar.sup.3 can be linked to form an anellated ring system, are prepared by oxidizing the corresponding triarylimidazoles II in an aqueous/organic two-phase system in the presence of active amounts of an onium salt III.