Patent ID: 7749599
Filing Date: 2010-07-06
Classification: B24B,Y10T

Abstract:
1. A cushioning material for a polishing pad, the cushioning material comprising a foam body being formed in a sheet shape with a self-skin at least at one surface and a polyethylene terephthalate (PET) film integrally formed on another surface to provide a sheet shaped foam body with an upper surface for contact with a hard material surface layer and an opposite lower surface, the foam body being formed of a polyurethane foam having a contact angle with water of 90° or more, the polyurethane foam being obtained by reacting hydrophobic dimer acid polyester polyol and polyisocyanate with each other, wherein the polyurethane foam is foamed and cured in a heated oven to obtain the polyurethane foam body in a sheet shape formed with the self-skin, said polyurethane foam being integrated with a PET film by covering the another surface with a PET film which is not subjected to removal, wherein a distance between said upper surface and said lower surface provides a thickness of 0.5 to 2 mm with said foam body having a density of 300 to 700 kg/m 3 .