Patent ID: 7381121

Claim:
A base pad of a chemical mechanical polishing pad, which does not include fine pores and has a hardness of 10-100 Shore D and compressibility of 1-10%, wherein the base pad is produced in such a manner that at least one compound is selected from the group consisting of polyurethane, PVC, polyvinyl alcohol, polyacrylic acid, polyacrylamide, polyethylene oxide, maleic acid copolymer, methylcellulose, and carboxymethylcellulose, is reacted in a first reactor to first produce a prepolymer, and the prepolymer is reacted with a substance having either a polyol reaction group in weight ratio of 3:1-2:1 or an ammonia reaction group in a weight ratio of 3:1-2:1 in a second step so as to achieve complete hardening.