Patent ID: 6824579
Filing Date: 2004-11-30
Classification: C09G,C09K,H01L

Abstract:
A polish composition comprising abrasive particles and about 0.05 to about 5% by weight of a polyelectrolyte selected from the group consisting of an anionic polyelectrolyte and a cationic polyelectrolyte, wherein the quantity of said anionic polyelectrolyte or cationic polyelectrolyte is in excess of the amount which adsorbs on the abrasive particles and is present in the composition as free or unabsorbed polyelectrolyte, and wherein the polyelectrolyte is an anionic polyelectrolyte where the polish composition is for selectively polishing silicon dioxide as compared to silicon nitride, or a cationic polyelectrolyte where the polish composition is for selectively polishing metals as compared to silicon dioxide, silicon nitride and/or silicon oxynitride.