Patent ID: 9156127
Filing Date: 2015-10-13
Classification: B24B,Y10T

Abstract:
1. A polishing pad, comprising a base material layer and a polishing layer provided on the base material layer, wherein the polishing layer comprises a thermoset polyurethane foam having roughly spherical interconnected hollow cells with an average cell diameter of 35 to 200 μm, and the polishing layer has a storage modulus E′ (40° C.) of 130 to 400 MPa at 40° C., a ratio of storage modulus E′ (30° C.) at 30° C. to storage modulus E′ (60° C.) at 60° C. [E′(30° C.)/E′(60° C.)] of 1 to less than 2.5, and a ratio of storage modulus E′ (30° C.) at 30° C. to storage modulus E′ (90° C.) at 90° C. [E′(30° C.)/E′(90° C.)] of 15 to 130.