Patent ID: 7731568

Claim:
A method of manufacturing a polishing pad used for chemical mechanical polishing comprising a polishing region, and a light-transmitting region, said method comprising: selecting a light transmittance material as material having a ΔT of 10 or less which is defined by the equation Δ T=T 0 −T 1 wherein T 1 is a light transmittance of the material for the light-transmitting region in percentage as measured at a plurality of wavelengths between 400 and 700 nm after dipping the material in an H 2 O 2 aqueous solution at pH 4 for 24 hours and T 0 is a light-transmittance of the material in percentage as measured at the plurality of the wavelengths before the dipping, and the light-transmitting region is in single layer structure comprising a polyurethane resin comprising 4,4′-diphenylmethane diisocyanate as an organic isocyanate and at least one high-molecular-weight polyol selected from the group consisting of polycaprolactone polyol, polyester polycarbonate polyol, and polyester polyol formed from adipic acid, hexane diol, and ethylene glycol, and inserting the selecting material to the light transmitting region on the polishing pad.