Patent ID: 6095902
Filing Date: 2000-08-01
Classification: B24B

Abstract:
A polishing pad comprising a urethane made from both a polyether polyol and a polyester polyol, wherein said urethane has the following properties: a density of greater than 0.5 g/cm.sup.3 a critical surface tension greater than or equal to 34 milliNewtons per meter, a tensile modulus of 0.02 to 5 GigaPascals, a ratio of tensile modulus at 30.degree. C. to the modulus at 60.degree. C. in the range of 1.0 to 2.5, hardness of 25 to 80 Shore D, a yield stress of 300 to 6000 psi, a tensile strength of 500 to 15000 psi, and an elongation to break up to 500%.