Patent ID: 8444727
Filing Date: 2013-05-21
Classification: B24B,B24D

Abstract:
1. A method of forming a polishing layer for a chemical mechanical polishing pad, comprising: providing a mold, having a mold base and a surrounding wall, wherein the mold base and the surrounding wall define a mold cavity, wherein the mold base is oriented along an x-y plane, wherein the mold cavity has a central axis, C providing a liquid prepolymer material; providing a plurality of microelements; providing a nozzle, having a nozzle opening; combining the liquid prepolymer material with the plurality of microelements to form a curable mixture; charging the curable mixture through the nozzle opening to the mold cavity during a charging period, CP, wherein the charging period, CP, is broken down into three separate phases identified as an initial phase, a transition phase and a remainder phase; wherein the mold cavity approximates a right cylindrically shaped region having a substantially circular cross section, C allowing the curable mixture in the mold cavity to cure into a cake; and, deriving the polishing layer from the cake.