Patent ID: 7579071

Claim:
A polishing pad which performs a polishing operation by moving in contact with a surface of an object being polished, the polishing pad comprising: a polishing layer consisting of a hydrophilic polymeric matrix, and liquid non-water soluble microelements and hollow polymeric microelements embedded in the polymeric matrix, wherein open pores defined by the embedded liquid microelements are uniformly distributed across an exterior surface of the polishing layer, and the liquid non-water soluble microelements and the hollow polymeric microelements are uniformly distributed across an interior surface of the polishing layer such that the open pores are not present therein, and wherein the liquid material of the polishing pad includes at least one material selected from the group consisting of aliphatic mineral oil, aromatic mineral oil, silicon oil without a hydroxyl group in a molecule, soybean oil, coconut oil, palm oil, cotton seed oil, camellia oil, and hardened oil.