Patent ID: 7427361

Claim:
A chemical mechanical polishing slurry comprising: an oxidizer; a diluent; optionally an abrasive material; and a plurality of particles that are insoluble in water wherein on the surfaces of a portion of said particles, a plurality of chelator compounds are attached through spacers that are different from the particles and the chelator compounds, wherein the spacers are covalently bound to the surfaces of said particles; wherein the chelator compounds contain pendant functional groups selected from the group consisting of hydroxyls, carboxylic acids, amines, amides, imines, imides, mercaptans, sulfonic acids, hydroxamic acids, carbonyl groups, esters, ethers, ureas, cyano groups, nitro groups, carbonates, inorganic salts thereof, or a combination thereof, and wherein at least a portion of the functional groups are no further than about 7 Å from another functional group.