Patent ID: 8084180

Claim:
A toner composition comprising toner particles comprising: a core comprising at least one crystalline resin and at least one amorphous resin, and one or more optional ingredients selected from the group consisting of colorants, optional waxes, and combinations thereof; and a shell comprising a high molecular weight amorphous linear polyester resin having a weight average molecular weight of from about 10,000 to about 5,000,000, wherein the molecular weight of the amorphous polyester resin in the shell is at least 20% higher than the molecular weight of the amorphous resin in the core, the viscosity of the amorphous polyester resin in the shell is at least 50% higher than viscosity of the amorphous resin in the core at 130° C., and wherein the shell has a thickness from about 50 nm to about 2 μm.