Patent ID: 9682457
Date: 2017-06-20
CPC Classifications: B24B,B24D

Claim:
1. A method for making a composite polishing pad, comprising the following steps: (a) forming a first resin coating on a release paper; (b) pre-baking the first resin coating at a first temperature of 40° C. to 130° C. to a semi-ripening state; (c) forming a second resin coating on the semi-ripened first resin coating, so that the second resin coating directly contacts with the semi-ripened first resin coating; (d) drying the first resin coating and the second resin coating at a second temperature of 100° C. to 140° C., so that the first resin coating becomes a cushion layer and the second resin coating becomes a polishing layer, wherein the second temperature is higher than the first temperature, the cushion layer has a hardness of 10 to 70 shore D, and the polishing layer has a hardness of 30 to 90 Shore D; and (e) removing the release paper to form a composite polishing pad, wherein the composite polishing pad comprises the cushion layer and the polishing layer.