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US 8,133,938 B2Granted
Radiation diffraction colorants
AssigneePPG Industries Ohio, Inc.
InventorsCalum H. Munro, Mark D. Merritt
Life of this patent
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Abstract
A radiation diffraction material comprising an ordered periodic array of particles held in a polymeric matrix is disclosed; the particles each comprise a core surrounded by a shell of a non-film forming composition that is different from the matrix. Methods for using the material are also disclosed.
Claims13
A radiation diffraction material comprising:
- an ordered periodic array of packed particles that diffracts radiation, said array defining interstitial spaces between particles in the array;
- and
- a polymeric matrix filled into said interstitial spaces between said packed particles, wherein said particles each comprise a core surrounded by a shell of a non-film forming composition that is different from said matrix, wherein the refractive index of said core is different from the refractive index of said shell, wherein said shell has a gradient of refractive index across the thickness of the shell, and wherein said matrix is produced from crosslinkable monomers and said monomers are present in said shell in a concentration gradient across the thickness of said shell.
Dependencies are inferred from the claim text.