| 摘要 |
<p>Automotive primer surfaces require fast cure times, resistance to chipping and lower volatile solvent contents due to environmental considerations. A coating composition capable of curring within 15 minutes which is suitably chip resistant and has acceptable higher solids levels has been formulated from (A) an adduct of (1) an epoxy resin having an average epoxide equivalent weight of from 140 to 1000 and (2) a polyamine having at least two primary and/or secondary amine groups, and (B) a substantially fully blocked polyisocyanate being blocked with ketoximes, aldoximes, lactams, N-hydroxy-imides or alcohols. The composition contains from 0.9 to 20 moles of polyamine per epoxide equivalent and from 0.75:1 to 2:1 ratios of latent NCO groups in component (B) per amine group in component (A). These formulations can additionally be employed as coil coatings and exterior coatings for beverage cans.</p> |
