Patent ID: 6312487
Filing Date: 2001-11-06
Classification: B24B,C09G,C09K,H01L

Abstract:
A polishing compound comprising a dispersion containing particles of silicon oxide, said particles having average diameter of 8 to 500 nanometers and particles of at least one kind of metal compound, said particles of said at least one kind of metal compound having an average diameter of 10 to 3000 nanometers and being selected from the group consisting of metal oxide other than silicon oxide, metal nitride and metal carbide, wherein the silicon oxide particles are contained in the dispersion at a concentration of from 1 to 15 wt. %, said metal compound particles being contained in the dispersion at a concentration of from 0.1 to 10 wt. %, and said dispersion further comprising a pH buffer combination selected from the group consisting of weak acid and strong base, strong acid and weak base, and weak acid and weak base, wherein the logarithms of reciprocal number of acid dissociation constant at 25.degree. C. of said weak acid and/or weak base is in the range of from 8.0 to 12.5, whereby said buffer combination maintains said dispersion at a pH in the range of from 8.3 to 11.5.