US Patent 8088544 - Polyester core-shell nanoparticles

http://www.freepatentsonline.com/8088544.html

Perhaps the most widely used application of microparticles is in toners for laser printers. This patent from Xerox teaches nanosized toner particles which lowers the temperature necessary to fuse the toner to paper. Claim 1 reads:

1. Core-shell nano-sized particles comprising particles having a core and a shell,

wherein the core of the particles comprises crystalline polyester and the shell of the particles comprises amorphous polyester and is substantially to completely free of crystalline material,

wherein the shell encapsulates the core, and wherein the nano-sized particles have an average particle size of about 1 nm to about 250 nm.