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Shaped glass articles and methods for forming the same

  • US 10,377,656 B2
  • Filed: 05/07/2015
  • Issued: 08/13/2019
  • Est. Priority Date: 05/07/2014
  • Status: Active Grant
First Claim
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1. A shaped glass article comprising:

  • a first layer comprising a first glass composition comprising an alkali metal oxide selected from the group consisting of Li2O, Na2O, K2O, and combinations thereof; and

    a second layer comprising a second glass composition;

    wherein a softening point of the first glass composition is less than a softening point of the second glass composition, an effective 108.2 P temperature of the glass article is at most about 900°

    C., and a viscosity of the second glass composition is at least about 108.3 P at the effective 108.2 P temperature of the glass article, and wherein the glass article comprises at least one of a surface roughness of at most about 1 nm as measured in accordance with ASTM F2791 and a waviness of at most about 50 nm as measured in accordance with ASTM C1652/C1652M.

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