Patent ID: 9381612
Filing Date: 2016-07-05
CPC Classification: B24B,C08G,C08J

Claim Text:
1. A polishing pad for polishing a semiconductor device, comprising a polishing layer having a polyurethane-polyurea resin foam containing substantially spherical cells, wherein the polyurethane-polyurea resin foam has a hard segment content (HSC) in a range from 26 to 34%, and the polyurethane-polyurea resin foam has a density D in a range from 0.30 to 0.60 g/cm the hard segment content (HSC) being determined by the following formula (1): wherein Mdi represents an average molecular weight of a polyisocyanate compound(s) constituting the polyurethane-polyurea resin per two isocyanate functional groups; Mg represents an average molecular weight of a polyol compound(s) constituting the polyurethane-polyurea resin per two hydroxyl functional groups; Mda represents an average molecular weight of a polyamine compound(s) constituting the polyurethane-polyurea resin per two amino functional groups; and r represents the equivalence ratio of isocyanate groups of the polyisocyanate compound(s) constituting the polyurethane-polyurea resin to hydroxyl groups of the polyol compound(s) constituting the polyurethane-polyurea resin, the polyurethane-polyurea resin foam has a storage elastic modulus E′ of 1 to 30 MPa, the storage elastic modulus E′ being measured at 40° C. with an initial load of 10 g, a strain range of 0.01 to 4%, and a measuring frequency of 0.2 Hz in a tensile mode, and the polyurethane-polyurea resin foam has a type A hardness of 20 to 55 degrees.