Patent ID: 8652967

Claim:
An adjuvant for CMP (chemical mechanical polishing) slurry, which comprises a polyelectrolyte salt containing: (a) a mixture of a linear polyelectrolyte having a weight average molecular weight of 2,000˜50,000 with a graft type polyelectrolyte that has a weight average molecular weight of 1,000˜20,000 and comprises a backbone and a side chain; and (b) a basic material, 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 the C2˜C4 oxyalkylene groups, and represents an integer of 1˜50.