AMBIENT CURE, FAST DRY AUTOMOTIVE REFINISH PRIMER SURFACER COMPOSITIONS AND METHODS OF USE

摘要

The present invention provides substantially isocyanate-free multicomponent compositions useful in making rapid dry automotive primer compositions and coatings, the compositions having a % PVC of from 20 to 60, or preferably, from 25 to 50, and comprising 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 which dries to enable sanding after only 15 to 45 minutes.

主权项

1. A substantially isocyanate free, ambient temperature curable, multicomponent primer composition useful as a sandable automotive primer and having a pigment volume concentration (% PVC) of from 20 to 60 comprising one or more pigments, extenders and/or fillers, 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.