Patent ID: 8314029
Filing Date: 2012-11-20
Classification: B24B,B24D,C08J

Abstract:
1. A method for manufacturing a polishing pad, comprising the steps or: preparing a cell-dispersed urethane composition by a mechanical foaming method; continuously discharging the cell-dispersed urethane composition from a single discharge port to a substantially central portion in a width direction of a face material A, while feeding the face material A; laminating a face material B on the cell-dispersed urethane composition; uniformly controlling a thickness of the cell-dispersed urethane composition by a thickness control means device; curing the cell-dispersed urethane composition with the controlled thickness without applying any additional load to the composition so that a polishing sheet comprising a polyurethane foam is formed; and cutting the polishing sheet, wherein the cell-dispersed urethane composition is discharged from the single discharge port at a temperature of 40 to 70° C., and the temperature of the face materials A and B is controlled to be in the range of ±20° C. of the temperature at which the cell-dispersed urethane composition is discharged.