Patent ID: 8105135
Filing Date: 2012-01-31
Classification: C09G,C09K,H01L,Y10T

Abstract:
1. A polishing slurry comprising: liquid medium; and particulate abrasive comprising soft abrasive particles, hard abrasive particles, and colloidal silica particles, wherein the soft abrasive particles have a positive surface charge and have a Mohs hardness of not greater than 6 and the hard abrasive particles have a Mohs hardness of not less than 9, and wherein the soft abrasive particles and the hard abrasive particles are present at a weight ratio of not less than 2:1, wherein the slurry has a basic pH and is at least partially flocculated, having soft agglomerates containing the soft abrasive particles, hard abrasive particles, and colloidal silica particles.