COATING POWDERS COMPRISING MACROCYCLIC OLIGOMERS

摘要

A coating powder comprising a macrocyclic oligomer and a ring-opening polymerization agent is applied to an article, fused, and converted to a linear polymer at a temperature of from about 160 to about 400.degree.C. The powder has the low melt viscosity and friability of a thermoset powder but is converted at high fusing temperature s to a tough coating having the good impact resistance and good elongation of a thermoplastic powder. The oligomer is a polyester, polycarbonate, polyamide, polyimide, polyamideimide. The article may be coated electrostatically or in a fluidized bed.