Abstract: There is printed on the same substrate on which the design is to be printed and under identical printing conditions a colour atlas that comprises a number of colour charts each of which comprises a number of colour fields that represent the printing one on top of another of three selected printing inks from a limited set of predetermined printing inks with different grades of the grid percentages of the grid screen printing stencils for the three printing inks, which stencils form the basis of the printing operation. The printing original is divided into a large number of, especially punctiform, image areas, and the colour impression is determined for each of those areas. The grid percentages of the grid screen printing stencils are determined for each area by comparison with the colour fields of the colour atlas. The necessary grid films are produced with reference to those grid percentages, and the grid screen printing stencils for the printing inks involved are produced from the grid films.

Abstract: Reaction products of a microgel that contains carboxylic acid groups with a nitrogen-containing base have a high latency and high stability towards mechanical influences and are suitable as hardeners for one-component epoxy resin systems.

Abstract: Photopolymerisable compositions are described which comprisea) 20 to 80% by weight of a specific film-forming, acid group-containing acrylate of higher molecular weight which is neutralised with ammonia or an amine or an inorganic base, at least 10% by weight of component a) consisting of a acrylate of higher molecular weight which is derived from a reaction product of a polymolecular epoxy resin that is advanced with a bisphenol and an ethylenically unsaturated monocarboxylic acid and after subsequent reaction with a cyclic anhydride of an organic polycarboxylic acid,b) 0.1 to 15% by weight of a photoinitiator,c) 1 to 25% by weight of optional components, andd) water, as well ase) at least one additional optional (meth)acrylate monomer or (meth)acrylate oligomer or a vinyl compound that can be crosslinked with light.The compositions contain no additional polymolecular polymer binders and which can be used as aqueous applicable photoresist compositions, preferably for coating printed circuit boards.

Abstract: Epoxy resin compositions which containa) at least one epoxy resin containing, on average, more than one 1,2-epoxy group per molecule,b) an anhydride hardener for the epoxy resin a),c) a toughener, andd) a compound containing two active hydrogen atoms which is capable of reacting with the epoxy resin a) have an outstanding toughness and are suitable as casting resins, laminating resins, moulding compounds, coating compounds and encapsulation systems for electrical and electronic components.

Abstract: There are disclosed photosensitive compositions based on water as solvent and/or dispersant for the components of said compositions, comprising 10-50% by weight of water-soluble and/or water-dispersible solid, crosslinkable film-forming polymers as binder, 4-50% by weight of water-soluble and/or water-dispersible photopolymerisable acrylate and/or methacrylate monomers and/or corresponding oligomers, 0.1 to 10% by weight of water-soluble and/or water-dispersible photoinitiator compounds for the photopolymerisable acrylate and/or methacrylate monomers and/or corresponding oligomers, and if the binder contains non-selfcrosslinking polymers, 2.5-40% by weight of water-soluble and/or water-dispersible crosslinking agents for the polymeric binder as thermal hardener, selected from the group consisting of epoxy resins, melamine resins and blocked polyisocyanates.