Patent ID: 11883925
Assignee: FUJIBO HOLDINGS, INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC B  C  H | IPC B

Claim 6:
7. A polishing pad comprising a polishing layer including a polyurethane sheet, wherein
a rate of change in a storage elastic modulus calculated in accordance with the following equation between a storage elastic modulus (E′wet) at 40° C. of the polyurethane sheet in a wet state after immersion in a water bath for 3 days in a tensile mode with an initial load of 148 g, a strain range of 0.1%, and a measurement frequency of 1.6 Hz, and a storage elastic modulus (E′dry) at 40° C. of the polyurethane sheet in a dry state without immersion in the water bath in a tensile mode with an initial load of 148 g, a strain range of 0.1%, and a measurement frequency of 1.6 Hz is 32% or less:

Rate of change in storage elastic modulus=|E′wet−E′dry|/E′dry×100.