Patent ID: 8147711

Claim:
An adjuvant for controlling polishing selectivity when polishing a cationically charged material simultaneously with an anionically charged material, which comprises: (a) a polyelectrolyte that forms an adsorption layer on the cationically charged material in order to increase the polishing selectivity of the anionically charged material; (b) a basic material; and (c) a fluorine-based compound, wherein the polyelectrolyte is a mixture of a linear polyelectrolyte having a weight average molecular weight of 2,000˜50,000 and a graft type polyelectrolyte having a weight average molecular weight of 1,000˜20,000 and including a backbone and a side chain, and wherein the graft type polyelectrolyte includes an alkoxypolyalkylene glycol mono(meth)acrylate monomer represented by the following Formula 1 at the side chain thereof: wherein R 1 is a hydrogen atom or methyl, R 2 O is a C2˜C4 oxyalkylene or a combination thereof, and may be added randomly or in the form of a block when it is a combination of at least two kinds of C2˜C4 oxyalkylene groups; R 3 is a C1˜C4 alkyl; and m is an average addition mole number of oxyalkylene groups, and represents an integer of 1˜50.