Abstract: A photopolymerizable composition which is screen-printable and has utility as a solder mask, the composition comprising aryloxyalkyl acrylate monomers or prepolymers, a diacrylate diluent, a monofunctional monomer and a free-radical initiating system.

Abstract: Photochromic aziridines of the formula ##STR1## wherein R.sub.1 and R.sub.2 separately are hydrogen, lower alkyl, phenyl, or ortho or para lower alkyl or lower alkoxy substituted phenyl, and together are alkylene having 4 to 7 carbon atoms inclusive, are coated onto a substrate to provide a microcrystalline deposit thereon preferably followed by application of a barrier coating which is substantially oxygen-impermeable. In this manner, a thermally stable optically erasable imaging medium is provided.

Abstract: A photosensitized polyamic acid film comprising polyamic acid and a photoinitiator, which is curable to a polyimide upon exposure to actinic radiation in the absence of externally applied heat.

Abstract: Photochromic aziridines of the formula ##STR1## wherein R.sub.1 and R.sub.2 taken separately are hydrogen, lower alkyl, phenyl, or ortho or para lower alkyl or lower alkoxy substituted phenyl, and wherein R.sub.1 and R.sub.2 taken together are alkylene having 4 to 7 carbon atoms, inclusive, are vapor deposited on a substrate, followed by application of a barrier coating which is substantially oxygen-impermeable to thereby provide a thermally stable optically erasable recording medium.

Abstract: A dielectric composition for influencing electric fields comprising a dielectric base material having electrically conductive and electrically insulating platelet-shaped particles and stress control devices made therefrom.

Abstract: A presensitized photographic speed light sensitive sheet structure suitable for producing a dry transfer element, comprising a substrate having a release coating thereon, and overlying the release coating a photo-sensitive layer comprising a silver halide emulsion. After light exposure to an original and development, the remaining silver image portions have a greater adhesion for a receptor surface when applied thereto under pressure than the adhesion of the indicia to the substrate under like pressure.

Abstract: A durable planographic driographic printing plate comprising a substrate having a highly abhesive layer thereon which is capable of repelling oleo ink when dry, and photobonded to the abhesive layer in image areas an oleo-ink receptive polymer layer. The photobonding occurs during imaging of the plate by including within the abhesive layer ethylenically unsaturated groups which are copolymerizable with a light-sensitive ethylenically unsaturated free radical initiated photopolymerizable material which provides the ink receptive image areas upon exposure.

Abstract: A photolithographic plate, method for preparation thereof, and salt compound useful in the preparation, the method involving the treatment of a metallic silver image on a substrate with a homogeneously stable acidic aqueous salt solution comprising a ferricyanide anion for oxidizing the metallic silver and an organic cation capable of forming a water-insoluble, inherently oleophilic complex with oxidized silver, the cation being derived from a protonatable nitrogen-substituted hydrocarbon compound containing a formal imine group therein which is in resonant association with adjacent groups within the hydrocarbon compound.

Abstract: A printing ink formulation capable of being utilized in driography comprising (a) a varnish comprising at least one polymer having a weight average molecular weight of at least about 25,000 and a solvent therefor, and (b) at least about 5.0 percent by weight, based on the varnish, of at least one non-reinforcing filler. Preferably, the ink also contains a minor amount of a low surface tension fluid which is incompatible with the varnish.

Abstract: A flexible, fire retardant electrically insulating film material comprising a thermoplastic film backing and a thermoset fire retardant coating on one or both surfaces of the backing. Preferably, a pressure sensitive adhesive coating is applied to either the film backing or overcoated on the thermoset coating.

Abstract: An acidic electroplating bath for providing a bright tin or tin/cadmium deposit containing stannous ions or mixtures of stannous and cadmium ions, a free acid, a non-ionic surfactant and as a brightener system a ring-halogenated aryl aldehyde, formaldehyde, and at least one compound of the formula: ##STR1## where n and m are zero or 1, and when n is 1, m is zero and when m is 1, n is zero, R.sub.1 is hydrogen or a lower alkyl group, and when both m and n are zero, R.sub.2 and R.sub.3 are hydrogen or lower alkyl groups and R.sub.4 is a formyl, alkyl carbonyl, carboxamido, or carboxy group or mixtures thereof, and when R.sub.4 is a formyl or alkyl carbonyl group or mixtures thereof, R.sub.1 or R.sub.2 is a lower alkyl group; when n is 1, the combination of R.sub.2 and Z represent ethenylene and R.sub.3 is an oxygen or sulfur radical, and R.sub.4 is as above; when m is 1, the combination of R.sub.2 and Z.sup.1 represent alkylene, R.sub.3 is hydrogen or a lower alkyl group and R.sub.4 is a carbonyl group.

Abstract: A photolithographic plate, method for preparation thereof, and salt compound useful in the preparation, the method involving the treatment of a metallic silver image on a substrate with a homogeneously stable acidic aqueous salt solution comprising a ferricyanide anion for oxidizing the metallic silver and an organic cation capable of forming a water-insoluble, inherently oleophilic complex with oxidized silver, the cation being derived from a protonatable nitrogen-substituted hydrocarbon compound containing a formal imine group therein which is in resonant association with adjacent groups within the hydrocarbon compound.

Abstract: A stabilizing agent and backfill composition for providing a thermally stable environment for buried electrical equipment comprising from about 90 to about 99 percent by weight soil and from about 1 to about 10 percent by weight of the stabilizing agent, which is comprised of a mixture of clay and a dispersing agent therefor, wherein the dispersing agent comprises at least about 0.25 percent by weight of the stabilizing agent.

Abstract: A curable composition especially adapted for the repair of damaged elastomeric cable jacket materials comprises reactive isocyanate and polyol components in defined concentrations which exhibits electrical and physical properties comparable to the jacket material and has excellent adhesion thereto. Initially the composition can be a liquid having sufficiently low viscosity permitting it to be poured in a mold around the damaged cable jacket, or it can be thickened to a self-supporting grease-like consistency. After curing in contact with a neoprene-based elastomer, the composition exhibits an adhesion thereto of at least about 7.0 pounds per inch.

Abstract: Infusible, solvent-insoluble, solvent-dispersible, inherently tacky, elastomeric polymeric microspheres which are formed from non-ionic monomers and comprise at least one oleophilic water-emulsifiable alkyl acrylate or methacrylate ester, and a suspension polymerization technique for producing the microspheres, which includes the use of an ionic suspension stabilizer.

Abstract: A process for imparting colored image patterns to an exposed lens retroreflective sheet material comprising disposing a preprinted sublimable-dye source sheet over the exposed lens surface under sufficient pressure to insure intimate contact therebetween, and heating the source sheet to the dye sublimation temperature, whereupon the retroreflective sheet becomes visibly patterned with the pattern on the source sheet.

Abstract: A fountain concentrate for preparing a dampening or fountain solution for lithography, consisting essentially of a mixture of a desensitizer, sulfanilic acid, and formaldehyde.

Abstract: A process for providing a priming layer of aluminum hydroxyoxide on aluminum and aluminum alloy surfaces comprising treating the surface with a chemical reagent having a solvent action for the naturally-occurring oxides which form on such surfaces until said oxides are dissolved, and contacting said surfaces with steam while a film of the reagent is still present on the metal surface. The priming layer provides for excellent adhesion of subsequent organic coatings to the metal surface.BACKGROUND OF THE INVENTIONThe present invention relates to the formation of priming films on aluminum and aluminum alloy surfaces so as to render such surfaces permanently receptive to subsequent organic coatings.Because of the weight of aluminum and its corrosion characteristics, aluminum and alloys therewith are being increasingly utilized in commercial, industrial and consumer areas in conjunction with organic coatings, e.g., aluminum siding for dwellings, containers for food and beverages, automobile parts, etc.

Abstract: Flame-retardant metal-clad dielectric sheeting useful in printed circuitry manufacture comprising an electrically conductive metallic layer adhered to a compacted dimensionally stable non-woven web by a polyester diepoxide adhesive system. The diepoxide is formed by end-capping a polyester formed from neopentyl glycol and an acid selected from the group consisting of azelaic, sebasic, and adipic acids with a moderately brominated bisphenol A-epichlorohydrin epoxy. The curing agent for the diepoxide system is a polyanhydride selected from the group consisting of polyazelaic, polyadipic, and polysebasic anhydrides.

Abstract: A plating bath for electrodeposition of tin/lead alloys contains stannous ion, lead ion, a fluoborate, fluosilicate or sulfamate radical and, as a brightener system, a nonionic polyoxyalkylated surfactant, a lower aliphatic aldehyde, an amine and a cyclic brightener selected from the group consisting of heterocyclic carboxaldehydes, aromatic ketones and carboxylic acids, the pH of the bath being less than about 3.0.