Patent ID: 6015499
Filing Date: 2000-01-18
Classification: B01D,B24B

Abstract:
A method of physically separating agglomerations of particles of an abrasive having a mean average particle size of between about 20-35 .mu.m from a chemical-mechanical polishing (CMP) process slurry stream while substantially retaining the non-agglomerated particles of said abrasive in the stream, said method comprising the steps of:(a) providing a filter media having a first and second side and being formed of at least one sheet of a fabric having a first and second surface defining a thickness dimension of said fabric therebetween, said fabric being woven of polymeric monofilament fibers and having a mean average pore size of between about 50-80 .mu.m;(b) supplying the slurry stream to the first side of said filter media; and(c) passing the slurry stream through said filter media to the second side thereof whereby at least a portion of the agglomerations of the abrasive are retained on the first side of said media.