Patent ID: 8231735

Claim:
A method for polishing, comprising forming a film to be polished with irregularities on a surface including a silicon oxide film, preparing a CMP polishing slurry, and moving the film and a polishing cloth on a polishing platen relatively in the presence of the CMP polishing slurry, thereby polishing the film wherein said preparing the CMP polishing slurry comprises (i) preparing a cerium oxide slurry containing (a) cerium oxide particles, (e) dispersant and (d) water and (ii) mixing with the cerium oxide slurry (b) a water-soluble high polymer compound selected from the group consisting of polyacrylic acid, ammonium polyacrylate, amine polyacrylate, polyvinyl acetate, polyvinyl imidazole and polyvinyl pyrrolidone in an amount to give a concentration of 0.05 to 3.0% by weight to the CMP polishing slurry and (c) an organic compound having an acetylene bond represented by the general formula in an amount to give a concentration of 0.05 to 5.00% by weight to the CMP polishing slurry: wherein R 3 to R 6 are each independently a hydrogen atom or a substituted or unsubstituted alkyl group of 1 to 5 carbon atoms; R 7 and R 8 are each independently a substituted or unsubstituted alkylene group of 1 to 5 carbon atoms; and “m” and “n” are each independently 0 or a positive number and m+n is in the range of 2 to 20, thereby obtaining the CMP polishing slurry wherein a pH of the CMP polishing slurry is 5 to 8.5.