Patent ID: 8545291
Filing Date: 2013-10-01
Classification: B24B,B24D,H01L

Abstract:
1. A polishing pad in which a large number of foams are formed by a dry molding method and which has a resin foamed body where opened pores of the foams are formed at a polishing surface for polishing an object to be polished, wherein communication holes are formed between the foams formed adjacently to each other at the resin foamed body, wherein the communication holes are formed at a ratio of 800 holes/cm wherein the resin foamed body is formed as a sheet having a thickness in a range of from 0.5 mm to 1.5 mm, and wherein a water absorption percentage expressed by a percentage of a change in a weight of the resin foamed body before and after the resin foamed body is dipped into water of 20 deg. C. to a weight of the resin foamed body before dipped is (31-16a) % or more when dipped for one hour and (56-24a) % or more when dipped for 24 hours, wherein “a” is the thickness of the resin foamed body.