Patent No. U.S. 7,141,618 B2
PPG Industries has obtained a patent for a powder coating comprised of a film-forming resin; and a plurality of particles dispersed in the resin, wherein the particles have been chemically modified, wherein a modification by attachment of a compound having a surface-active moiety that lowers the solid surface tension of the particle, and a group that reacts with a functional group of the particle, to have a lower surface tension, thereby making the particles more incompatible with the film-forming resin than the particles would be without the modification.