Method of coating with powders comprising macrocyclic oligomers
AssigneeRohm and Haas Company
InventorsGlenn D. Correll, Tina L. Tullos, Gordon L. Tullos
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Abstract
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° C. The powder has the low melt viscosity and friability of a thermoset powder but is converted at high fusing temperatures 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.
Claims7
A method for coating an article comprising contacting the article with a particulate coating powder comprising a flow control agent, a ring-opening polymerization agent, and a macrocyclic oligomer selected from the group consisting of polyesters, polycarbonates, polyamides, polyimides, and polyamideimides, fusing the powder and converting the oligomer to a thermoplastic or thermosetting polymer, and causing the fused powder to flow across the surface of the article.
Dependencies are inferred from the claim text.