Patent ID: 6682402
Filing Date: 2004-01-27
Classification: B24B,B24D

Abstract:
A method of planarizing a silicon, silicon dioxide or metal substrate, comprising:a) providing a polishing pad having a polishing layer, the polishing layer consisting essentially of a hydrofoil polishing layer which is not a felt-based polishing pad created by coalescing a polymer onto a fiber substrate, said polishing layer having a polishing surface consisting essentially of a polishing material having: i. a density greater than 0.5 gm/cm3; 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 30Â° C. to tensile modulus at 60Â° 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; and viii. an elongation to break less than or equal to 500%, said polishing material comprising at least one moiety from the group consisting of: a urethane produced by a catalyst which accelerates an isocyanate reaction, said catalyst being devoid of copper, tungsten, iron or chromium; a carbonate; an amide; an ester; an ether; an acrylate; a methacrylate; an acrylic acid; a methacrylic acid; a sulphone; an acrylamide; a halide; and a hydroxide, said polishing surface having a random surface topography and having a macro-texture produced by solidifying a flowable material, and b) chemical mechanical polishing a metal, silicon or silicon dioxide substrate with said pad.