Retroreflective colorants

US9720135B2 · kind B2 · utility

Assignee

• PPG Industries Ohio, Inc. · US

Inventors

• Noel R. Vanier · Wexford, US
• Xiangling Xu · Pittsburgh, US
• Eldon L. Decker · Gibsonia, US
• Justin Bohn · Pittsburgh, US
• John Donnelly · Monroeville, US
• Beverly Bendiksen · Dorpsstraat, US
• Adam Choros · Delmont, US

Key dates

• Filing date: May 1, 2014
• Grant date: Aug 1, 2017
• Expiry date: May 15, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31855
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A reflective material comprising a multilayered array of particles encapsulated by a matrix material, the reflective material defining a primary surface, the reflective material exhibiting: (i) visible retroreflection of incident radiation, wherein a wavelength of visible retroreflected radiation decreases from a first visible wavelength at a first angle to the primary surface to a second, shorter wavelength of visible retroreflected radiation as the viewing angle to the primary surface increases; and (ii) Bragg diffraction of the incident radiation, wherein the wavelength of radiation Bragg diffracted normal to the primary surface is longer than the wavelength of visible radiation, such that no visible radiation is retroreflected or Bragg diffracted in a direction normal to the primary surface.