Abstract: An applicator assembly is provided for concurrently dispensing plural flowable component materials in a mixed state. Moreover, the applicator assembly is more versatile and is particularly useful when one or more additional components are to be concurrently dispensed with the basic two component materials. The applicator assembly permits dispensing of additives with basic two part mixtures, and allows the application of three or more part chemical systems. A multi-component applicator assembly is described which is convertible between different component number multi-component arrangements, and includes a barrel assembly having at least one barrel detachably connected to the other barrels, at least two of which are fixed to one another.

Abstract: Deposition of extraneous metal on the surface of an electroless or electrolytic plating resist is reduced by dispersing into the resist formulation fumed aluminum oxide microparticles.

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: 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.