Abstract: A solid colored composition which includes a colorant and an ultraviolet radiation transorber. The colorant, in the presence of the ultraviolet radiation transorber, is adapted, upon exposure of the transorber to ultraviolet radiation, to be mutable. The ultraviolet radiation transorber is adapted to absorb ultraviolet radiation and interact with the colorant to effect the irreversible mutation of the colorant. By way of example, the solid colored composition can be a toner adapted to be utilized in an electrophotographic process. The toner includes the colorant and ultraviolet radiation transorber as just described, and a carrier. The carrier can be a polymer, and the toner may contain a charge carrier. The ultraviolet radiation in general will have wavelengths of from about 100 to about 375 nanometers. Especially useful incoherent, pulsed ultraviolet radiation is produced by a dielectric barrier discharge excimer lamp.

Abstract: An electrophotographic process wherein an image is formed with toner comprising a mutable colorant and an ultraviolet radiation transorber so that an image formed by the electrophotographic process can be altered in color or erased. The electrophotographic process comprises the steps of creating an image on a photoreceptor surface, applying a toner on the photoreceptor surface to form a toner image which replicates the image, transferring the toner image to a substrate, and fixing the toner image to the substrate. The toner comprises a mutable colorant, an ultraviolet radiation transorber, and a carrier comprising a polymer. The ultraviolet radiation transorber is adapted, upon exposure to ultraviolet radiation, to interact with the mutable colorant to irreversibly mutate the mutable colorant from an initial absorption maximum to a new absorption maximum different from the initial absorption maximum.

Abstract: An improved ultraviolet curable aqueous latex paint suitable for use as coil coatings comprises a high molecular weight primary latex binder in combination with minor amounts of an emulsified low molecular weight cross-linking agent adapted to cross-link the high molecular weight latex particles upon exposure to ultraviolet energy.

Abstract: A heat-curable, aqueous coating composition comprises a polymer having pendant primary and/or secondary amine groups and a cross-linking agent having alpha-, beta-ethylenically unsaturated carbonyl groups in aqueous dispersion. The amine groups are protonated to render the polymer water dispersible. In one preferred embodiment, the coating composition is useful in cathodic electrocoating.

Abstract: A curable coating composition contains a polymer having pendant mercaptan groups and a bis-maleimide cross-linking agent. The mercaptan groups of the polymer cross-link with the bis-maleimide upon curing to form a fully cured coating. In a preferred embodiment, the coating composition serves as a cathodic electrocoating composition.

Abstract: An electrocoating composition containing a polymer having pendant tertiary amine groups, a polymer containing pendant mercaptan groups, an apha-, beta-ethylenically unsaturated carbonyl cross-linking agent, and a photosensitizer can be electrodeposited onto a cathode substrate disposed within an aqueous electrocoating bath. Full cure of the electrodeposited coating on the cathode substrate is obtained by the combination of heat curing and ultraviolet radiation curing. In a specific embodiment of the present invention, a single polymer contains both the pendant tertiary amine groups and pendant mercaptan groups.

Abstract: A heat-curable coating composition contains a polymer having pendant amine groups and a bis-maleimide cross-linking agent in aqueous dispersion. The amine groups of the polymer are protonated to render the polymer water dispersible. The amine groups are adapted to become de-protonated for cross-linking with the bis-maleimide under heating to form a fully cured film. In a preferred embodiment, the coating composition serves as a cathodic electrocoating composition.

Abstract: An electrocoating composition containing a polymer having pendant tertiary amine groups, a polymer containing pendant mercaptan groups, an alpha-,beta-ethylenically unsaturated carbonyl cross-linking agent, and a photosensitizer can be electrodeposited onto a cathode substrate disposed within an aqueous electrocoating bath. Full cure of the electrodeposited coating on the cathode substrate is obtained by the combination of heat curing and ultraviolet radiation curing. In a specific embodiment of the present invention, a single polymer contains both the pendant tertiary amine groups and pendant mercaptan groups.

Abstract: A heat-curable electrocoating composition containing a polymer having pendant mercaptan groups and cross-linking agent having alpha-,beta-ethylenically unsaturated carbonyl groups can be electrodeposited onto a cathode substrate disposed within an aqueous electrocoating bath. Upon electrodeposition onto the substrate, the mercaptan groups cross-link with the alpha-,beta-ethylenically unsaturated carbonyl groups upon curing to form a fully cured electrodeposited coating on the cathode substrate.

Abstract: An electrocoating composition containing a polymer having pendant mercaptan groups and a bis-maleimide cross-linking agent can be electrodeposited onto a cathode substrate disposed within an aqueous electrocoating bath. The mercaptan groups of the polymer cross-link with the bis-maleimide upon curing to form a fully cured electrodeposited coating on the cathode substrate.

Abstract: An electrocoating composition containing a polymer having pendant amine groups, a bis-maleimide crosslinking agent and an ultraviolet photosensitizer can be electrodeposited onto a cathode substrate disposed within an aqueous electrocoating bath. The amine groups of the polymer are protonated to render the polymer water dispersible prior to electrodeposition. Upon electrodeposition, the amine groups become de-protonated. The bis-maleimide crosslinks the polymer upon ultraviolet irradiation of the electrocoated cathode substrate to form a fully cured electrodeposited coating on the cathode substrate.

Abstract: An electrocoating composition containing a polymer having pendant tertiary amine groups, a polymer containing pendant mercaptan groups, a bis-maleimide cross-linking agent, and a photosensitizer can be electrodeposited onto a cathode substrate disposed within an aqueous electrocoating bath. The amine groups and the mercaptan groups are protonated with acid to render the polymers water dispersible prior to electrodeposition and are adapted to become deprotonated upon electrodeposition. Full cure of the electrodeposited coating on the cathode substrate is obtained by the combination of heat curing and ultraviolet radiation curing. In a specific embodiment of the present invention, a single polymer contains both the pendant tertiary amine groups and pendant mercaptan groups.

Abstract: U. V. polymerization of a photopolymerizable vehicle is improved by incorporating into the vehicle about 0.5-10% by weight of a 2-methyl substituted benzimidazole.

Abstract: Ultraviolet polymerization of photopolymerizable binders or vehicles is improved by incorporating thereinto a sensitizer composition comprising an activated halogenated azine compound.