Patent ID: 11939491
Assignee: FUJIMI INCORPORATED
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 10:
11. The polishing method according to claim 1, further comprising an intermediate polishing step Pi between the final polishing step Pf and the preliminary polishing step Pp,
wherein the intermediate polishing step Pi is a step of polishing using a polishing composition Si in which the polishing removal rate obtained in the standard test 2 is more than 0 nm/min and less than 50 nm/min,
the polishing composition Si contains an abrasive Ai and a basic compound Bi and contains substantially no hydroxyethyl cellulose,
when D90 of the particles present in the polishing composition Si, which is measured by the dynamic light scattering method, is R1i, and
D90 of the particles present in the polishing composition Si after adjusting the pH to 12.5 using potassium hydroxide and stirring for 30 minutes, which is measured by the dynamic light scattering method, is R2i,
R1i/R2i is 1.25 or less.