Scratch-resistant articles with a gradient layer

US9703011B2 · kind B2 · utility

Assignee

• CORNING INCORPORATED · US

Inventors

• Kaveh Adib · Corning, US
• Shandon Dee Hart · Elmira, US
• Karl William Koch, III · Elmira, US
• Charles Andrew Paulson · Corning, US
• James Joseph Price · Corning, US
• Paul Arthur Sachenik · Corning, US

Key dates

• Filing date: Apr 25, 2014
• Grant date: Jul 11, 2017
• Expiry date: Nov 9, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2218/155
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Embodiments of this disclosure pertain to articles that exhibit scratch-resistance and improved optical properties. In some examples, the article exhibits a color shift of about 2 or less, when viewed at an incident illumination angle in the range from about 0 degrees to about 60 degrees from normal under an illuminant. In one or more embodiments, the articles include a substrate, and an optical film disposed on the substrate. The optical film includes a scratch-resistant layer and a refractive index gradient. In one or more embodiments, the refractive index includes a refractive index that increases from a first surface at the interface between the substrate and the optical film to a second surface. The refractive index gradient may be formed from a compositional gradient and/or a porosity gradient.