Abstract: A radiation-curable formulation employs an electrically conductive primary filler, comprised of elements of elongate form and having surfaces that reflect the actinic radiation to which the photoinitiator employed is responsive, and a secondary filler that is electrically semiconducting and is substantially transparent to the actinic radiation; silver-coated cylindrical fibers or rods will typically constitute the primary conductive filler. Solid deposits cured from the formulation may function, for example, as sealing elements, gaskets, solder joints, and coatings.

Abstract: A radiation-curable formulation employs an electrically conductive filler comprised of elements of elongate form, which elements have surfaces that reflect the actinic radiation to which the photoinitiator employed is responsive. Silver-coated cylindrical fibers or rods will typically constitute the conductive filler, and solid deposits cured from the formulation may function as, for example, sealing elements, gaskets, and solder-like joints. In certain preferred embodiments the formulation will include an active oxygen free radical-generating catalyst, the presence of which enhances curing even though the reaction conditions are such that normal thermal catalysis temperatures are not attained.

Abstract: The use of a phosphine oxide photoinitiator enables the effective curing of a polymerizable acrylate formulation despite the incorporation of a high concentration of a fluorescing agent, thereby facilitating, and enhancing the efficiency of, evaluation of the cured deposit utilizing its fluorescent response.

Abstract: A reflector/lamp assembly employs a heat-sink component that includes a rigid, elongate, relatively wide and thin conductor element which is disposed forwardly of the reflector rim and extends radially to a distal point lying substantially beyond the axial projection of the rim. The heat-sink component efficiently dissipates thermal energy without attenuating the reflected radiation and without imposing physical constraints or stresses.

Abstract: The adhesive formulation minimizes corrosion of copper surfaces (e.g., of motor commutators) caused by volatile ingredients of conventional acrylate compositions, and cure speeds are significantly increased thereover.

Abstract: The polymerizable acrylate formulation, and method utilizing the same, employ a catalyst system that includes a tertiary aromatic amine compound and an air-curing polyether-ene polymer, in a specified ratio, in combination with an acid ingredient and a transition metal that together form a coordination compound. The formulation cures through bulk, as well as on the surface, in a highly effective manner.

Abstract: An acrylate composition, especially useful for producing conformal coatings on circuit board assemblies, includes a photoinitiator and an air-curing system, the latter being comprised of a compound having multiple allyloxy groups in its molecule and a transition metal salt catalyst. The composition is highly stable against auto-induced reaction in the absence of oxygen and at room temperature; it contains no active oxygen catalyst and no nonreactive diluent, and is advantageously formulated as a one-part product.

Abstract: An acrylate encapsulation formulation reacts at a high rate of speed, when exposed to radiation inclusive of wavelengths in the ultraviolet and the visible range, to initially produce a relatively thick skin and to ultimately cure to a relatively low-stress deposit having good physical definition and surface properties. The method entails exposure of the formulation, on an object, to radiation for initialing photopolymerization and thermal polymerization, and the apparatus includes closely juxtaposed actinic radiation and thermal energy sources.

Abstract: An acrylate encapsulation formulation reacts at a high rate of speed, when exposed to radiation inclusive of wave-lengths in the ultraviolet and the visible range, to initially produce a relatively thick skin and to ultimately cure to a relatively low-stress deposit having good physical definition and surface properties. The method entails exposure of the formulation, on an object, to radiation for initialing photopolymerization and thermal polymerization, and the apparatus includes closely juxtaposed actinic radiation and thermal energy sources.

Abstract: A multi-part composition is provided which is suitable for use as an adhesive, a potting compound, a coating or a sealant. It consists of a polymerizable acrylate formulation and an activating formulation, the latter usually comprising an amine-aldehyde condensation product diluted with a liquid vinyl ether; liquid epoxides may also be included as diluents in the activating formulation.

Abstract: A catalyst system for effecting polymerization in a two-part formulation, which contains an oxygen-containing ethylenically unsaturated monomer, consists of a selected acid, a selected aromatic amine compound, and a transition metal compound; active-oxygen, free-radical catalysts are excluded. Because of the nature of the catalyst system, efficient reaction does not require intimate mixing of the two components of the formulation, which may therefore be applied effectively as fine-droplet sprays from a common, ultrasonically vibrated head.

Abstract: A water-soluble coating or other deposit is produced from a formulation that is comprised of a curable liquid substance and a dispersed, particulate effervescing agent. The formulation is particularly useful as a solder resist in the manufacture of PCBs, and the preferred composition contains n-vinyl-2-pyrrolidone, N,N-dimethylacrylamide, and polyvinylpyrrolidone.

Abstract: A prefocused lamp and reflector assembly comprises an elongated lamp having opposite end portions that extend through aligned openings in the wall defining the reflective cavity. The end portions of the lamp are engaged in receptacle portions on the base of the assembly, and the reflector is affixed to the base in a position empirically focused to afford maximum radiation output intensity.

Abstract: A system and method for effecting the continuous, in-line coating of workpieces, freely supported upon a conveyor, utilizes an ultrasonic spray unit for delivery of a photo-polymerizable coating material. The deposited liquid is immediately irradiated to initiate curing, and the system and method are particularly well adapted for the formation of conformal coatings on printed circuit boards, utilizing two-part coating compositions.

Abstract: A multi-part composition is provided which is suitable for use as an adhesive, a potting compound, a coating or a sealant. It consists of a polymerizable acrylate formulation and an activating formulation, the latter usually comprising an amine-aldehyde condensation product diluted with a liquid vinyl ether; liquid epoxides may also be included as diluents in the activating formulation.

Abstract: A one-piece needle guide for use with a medical ultrasonic scanning apparatus to guide a needle. The needle guide includes a body which is adapted to be releasably secured to the scanning apparatus. A tubular channel extends the length of the body on its upper surface. The channel is for engaging and guiding the needle in proper alignment with the scanning apparatus. A pair of flexible lips form the shape of the channel and are adapted to secure the needle in a slidable manner. The flexibility of the lips allow the needle to be removed from the body.

Abstract: A water-soluble coating or other deposit is produced from a formulation that is comprised of a curable liquid substance and a dispersed particulate effervescing agent. The formulation is particularly useful as a solder resist in the manufacture of PCBs, and the preferred composition contains n-vinyl-2-pyrrolidone, N,N-dimethylacrylamide, and polyvinylpyrrolidone.

Abstract: An activated oil formulation provides a surface layer upon the faces of a transformer coil stack, to which is subsequently applied a layer of a polymerizable liquid adhesive composition. The adhesive composition is curable by both chemically induced and photo-induced reactions, and the oil formulation includes a chemical cure initiator for the adhesive composition. A coated laminate stack is produced in which fully cured fillets of the solid coating extend between the plates and bond together their confronting marginal portions.

Abstract: A reactive acrylic adhesive, activated by actinic radiation, includes, in addition to a photoinitiator, at least about 1.0 percent by weight of a perester compound or cumene hydroperoxide, and 0.5 percent of a tautomeric organic acid, for enhanced bond strength.

Abstract: A reactive acrylic adhesive, activated by actinic radiation includes, in addition to a photoinitiator, at least about 1.0 percent by weight of a perester compound or cumene hydroperoxide, and 0.5 percent of a tautomeric organic acid, for enhanced bond strength.