Powder coating compositions and method

A composition comprising:

• (a) about 50% to about 100%, by total weight of the composition, of a blend of polyesters comprising (i) a first polyester having a weight average molecular weight of about 10,000 to about 80,000 and a glass transition temperature of greater than 45° C. to about 100° C., and (ii) a second polyester having a weight average molecular weight of about 10,000 to about 70,000 and a glass transition temperature of about −10° C. to about 45° C., wherein the Tg of the first polyester is about 5° C. to about 60° C. higher than the Tg of the second polyester, and wherein the first polyester and the second polyester are present in a weight range of about 1 to 3 to about 1 to 9;
• (b) 0% to about 25%, by total weight of the composition, of the modifying resin selected from the group consisting of an epoxy or phenoxy resin having an epoxy equivalent weight of about 500 to about 15,000, an end-capped epoxy resin having a weight average molecular weight of about 300 to about 10,000, an acrylic resin having a weight average molecular weight of about 15,000 to about 100,000, a polyolefin resin having a weight average molecular weight of about 15,000 to about 1,000,000, and mixtures thereof;
• (c) up to about 30%, by total weight of the composition, of an inorganic filler;
• and
• (d) 0% to about 4%, by total weight of the composition, of a flow control agent;
• and
• (e) 0% to about 50%, by total weight of the composition, of a second modifying polymer,
• said composition in the form of a powder having a particle size of 100 microns or less.