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Scratch-Resistant Articles with Retained Optical Properties

  • US 20140377522A1
  • Filed: 09/09/2014
  • Published: 12/25/2014
  • Est. Priority Date: 05/07/2013
  • Status: Active Grant
First Claim
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1. A transparent article comprising:

  • a substrate having opposing major surfaces; and

    an optical film structure disposed on a first major surface of the substrate forming a front face,wherein the article comprisesa maximum hardness of about 12 GPa or greater, as measured on the front face by a Berkovich Indenter Hardness Test along an indentation depth of about 100 nm or greater, andany one or more of;

    article transmittance color coordinates in the (L*, a*, b*) colorimetry system exhibiting a color shift of less than about 2 from a reference point as measured at the front face, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the transmittance color coordinates of the substrate, andarticle reflectance color coordinates in the (L*, a*, b*) colorimetry system exhibiting a color shift of less than about 2 from a reference point as measured at the front face, the reference point comprising at least one of the color coordinates (a*=0, b*=0) and the reflectance color coordinates of the substrate,wherein the color shift is defined by √

    ((a*article

    a*substrate)2+(b*article

    b*substrate)2).

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