Burnish resistant powder coating composition

#This invention relates to a powder coating composition, and more particularly a powder coating composition that exhibits excellent resistance to degradation and is burnish resistant.

#Powder coating compositions are now being used in a wide variety of painting techniques. They have become increasingly desirable, particularly in the automotive and track industries, for various reasons including those related to ecology, health and safety. For example, powder coating compositions can reduce the amount of volatile solvents used as compared to liquid paints. After curing, typically using heat, only a very small amount, if any, of volatile solvent is given off to the environment.

#Various powder coating compositions have been suggested. For example, a powder coating composition with excellent exterior durability can be prepared by reacting an acid group-containing acrylic polymer and a curing agent, triglycidyl isocyanurate (TGIC). Such coating compositions, however, often have poor stability and physical properties.

#The following Example illustrates the practice of the present invention. The Example should not be construed as limiting the invention to anything less than that which is disclosed. The process conditions are as follows:

#Premixing: Henschel FM-10 Premixer, residence time=60 seconds per batch

#Melt-Mix Extrusion: Werner & Pfleiderer ZSK-30, Zone 1:100 C, Zone 2: 80 C, Screw Speed:250 RPM, Feed Rate: 60 lbs./hr.