Abstract: The present invention comprises methods for the pretreatment of substrates, including without limitation, metal or glass surfaces, with activators of reduced VOC content. Preferred embodiments of the invention comprise activators containing methyl acetate as a solvent, at least one adhesion promoter, and a luminescent agent responsive to light of specific wavelengths. In some embodiments, without limitation, an activator composition of reduced VOC content and also comprising a luminescent agent is applied to a substrate before application of additional adhesives or paints, and the substrate is examined under a controlled light source as required to excite the luminescent agent. The luminescent agent in the activator composition appears distinctly where the activator has been applied to the surface, allowing one to detect whether the activator has been properly applied.

Abstract: The present invention comprises methods for the pretreatment of substrates, including without limitation, metal or glass surfaces, with activators of reduced VOC content. Preferred embodiments of the invention comprise activators containing methyl acetate as a solvent, at least one adhesion promoter, and a luminescent agent responsive to light of specific wavelengths. In some embodiments, without limitation, an activator composition of reduced VOC content and also comprising a luminescent agent is applied to a substrate before application of additional adhesives or paints, and the substrate is examined under a controlled light source as required to excite the luminescent agent. The luminescent agent in the activator composition appears distinctly where the activator has been applied to the surface, allowing one to detect whether the activator has been properly applied.

Abstract: The invention described herein pertain generally to at least semi-rigid polyurethane foams which cure upon exposure to moisture and which contain major amounts of non-ozone depleting hydrofluorocarbon gas. The foams additionally contain a diisocyanate, preferably, 4,4′-diphenylmethane diusocyanate (MDI) and optionally including higher oligomers of MDI (polymeric MDI) in addition to at least two polyols of different molecular weights, e.g., as measured by number average molecular weight, preferably a polyester or polyether polyol, more preferably a polyalkylene polyol. The at least two polyols have a difference in molecular weight which is greater than or equal to 10%, preferably greater than or equal to 20%, more preferably greater than or equal to 35%, and most preferably greater than or equal to 50%, said number average molecular weight of the higher molecular weight polyol being no greater than approximately 4,000.