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Increased wetting of colloidal silica as a polishing slurry

  • US 10,377,014 B2
  • Filed: 02/28/2017
  • Issued: 08/13/2019
  • Est. Priority Date: 02/28/2017
  • Status: Active Grant
First Claim
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1. A method of polishing a sapphire surface, comprising:

  • abrading a sapphire surface with a rotating polishing pad and a polishing composition,wherein the polishing composition comprises an effective amount of colloidal silica and a surfactant, the colloidal silica has a particle size distribution of from about 5 nm to about 120 nm;

    the ratio of the standard deviation of the particle size of the colloidal silica (CT) to the mean particle size of the colloidal silica (r) is from about 0.30 to about 0.90; and

    the surfactant is one represented by the following formula I or II,

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