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AssigneesDow Global Technologies LLC, Rohm and Haas Company
InventorsNahrain E. Kamber, John N. Argyropoulos, Paul J. Popa, Scott A. Murray
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The present invention provides substantially isocyanate-free multicomponent compositions useful in making rapid dry primer compositions and coatings, the compositions comprising one or more carboxylic acid compounds that contain one of a benzothiazole, benzoxazole, or benzimidazole group, preferably, that contain a benzothiazole group, one or more hydrophobic sulfonic acid catalyst, one or more pigment, extender or filler, one or more a) polycarbamates from alkyd polyol or acrylic polyol and one or more b) a polyaldehydes or the acetal or hemiacetal thereof as a second component. The multicomponent compositions cure quickly at a temperature of from 0° C. to less than 80° C. to form a crosslinked polyurethane coating having improved humidity and corrosion resistance.
A substantially isocyanate free, ambient to low bake temperature (less than 80° C.) curable, multicomponent primer compositions useful for direct to metal coatings comprising one or more pigments, extenders and/or fillers, one or more ion-exchanged amorphous silicas containing a metal cation, one or more carboxylic acid compounds that contain one of a benzothiazole, benzoxazole, or benzimidazole group, one or more hydrophobic sulfonic acid catalysts, one or more a) polycarbamates of an alkyd polyol, an acrylic polyol, or their mixtures, and one or more b) polyaldehydes or acetals or hemiacetals thereof in a component separate from the one or more polycarbamates.
Dependencies are inferred from the claim text.