Patent ID: 6638328
Filing Date: 2003-10-28
Classification: C09G,C09K

Abstract:
A bimodal slurry system for a chemical mechanical polishing (CMP) process comprising:an aqueous dispersion comprising a plurality of first particles and a plurality of at least one type of second particles; said first particles having a mean particle diameter larger by at least a factor of 3 than a mean particle diameter of the at least one type of second particles; said first particles formed of either (1) a polymer material or (2) a porous inorganic material having an interconnecting porosity from about 20 to about 80 percent; said first particles further being compressible in a CMP process; said at least one type of second particles being deposited to surround the periphery of the first particles; said at least one type of second particles having a relatively higher hardness compared to the first particles.