Patent ID: 6022268
Filing Date: 2000-02-08
Classification: B24B,B24D

Abstract:
A polishing pad comprising:a hydrophilic polishing layer having no intrinsic ability to absorb or transport a plurality of slurry particles, said polishing layer having a polishing surface consisting essentially of a polishing material having:i. a density greater than 0.5 g/cm.sup.3 ;ii. a critical surface tension greater than or equal to 34 milliNewtons per meter;iii. a tensile modulus of 0.02 to 5 GigaPascals;iv. a ratio of tensile modulus at 30.degree. C. to tensile modulus at 60.degree. C. of 1.0 to 2.5;v. a hardness of 25 to 80 Shore D;vi. a yield stress of 300-6000 psi;vii. a tensile strength of 1000 to 15,000 psi; andviii. an elongation to break less than or equal to 500%,said polishing material comprising at least one moiety from the group consisting of: 1. a urethane produced by a catalyst which accelerates an isocyanate reaction, said catalyst being devoid of copper, tungsten, iron or chromium; 2. a carbonate; 3. an amide; 4. an ester; 5. an ether; 6. an acrylate; 7. a methacrylate; 8. an acrylic acid; 9. a methacrylic acid; 10. a sulphone; 11. an acrylamide; 12. a halide; and 13. a hydroxide, andsaid polishing surface having a random surface topography and having a macro-texture produced by solidifying a flowable material.