Patent ID: 6179950
Filing Date: 2001-01-30
Classification: B24B,B24D,Y10T

Abstract:
A process for joining together a first polishing pad with a second polishing pad to form a larger pad for a machine that performs chemical-mechanical polishing of silicon wafers, the process comprising:laying a first polishing pad on a surface;laying a second pad on the surface so that a portion of the second pad overlies a portion of the first pad, creating an overlap region;cutting through the first and second pads in the overlap region to form a first cut edge on the first pad and a second cut edge on the second pad, the first and second cut edges having shapes which are complementary, and wherein the step of cutting is done in a first direction that is generally opposite to a second direction that a polishing fluid is expected to move on a surface of the pad during operation of said polishing machine, thereby sloping the first and second cut edges away from the second direction to inhibit passage of the polishing fluid between the first and second cut edges;bringing the first and second cut edges into engagement; andjoining the first pad to the second pad at the first and second cut edges.