Color effect compositions
AssigneePPG Industries Ohio, Inc.
InventorsCalum H. Munro, Mark D. Merritt, Paul H. Lamers
Life of this patent
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Abstract
A coating composition comprising a resinous binder and a color effect colorant in particulate form. The colorant includes an ordered periodic array of particles held in a polymer wherein a difference in refractive index between the polymer and the particles is at least about 0.01. The colorant reflects visible light according to Bragg's law to yield a goniochromatic effect to the coating composition.
Claims73
A colored composition comprising a carrier and a colorant in particulate form, wherein said colorant is produced by providing a dispersion of similarly charged particles in a carrier to produce an ordered periodic array of said particles, coating said array of particles with a matrix, and fixing said array of particles within said matrix, whereby said colorant comprises an ordered periodic array of said particles held in said matrix wherein a difference in refractive index between said matrix and said particles is at least about 0.01 and said matrix is a cross-linked polymer.
A radiation diffraction material comprising an ordered periodic array of particles held in a matrix, wherein said radiation diffractive material is produced by providing a dispersion of similarly charged particles in a carrier to produce an ordered periodic array of said particles, coating said array of particles with a matrix, and fixing said array of particles within said matrix, wherein a difference in refractive index between said matrix and said particles is at least about 0.01 and said matrix is a cross-linked polymer.
A radiation diffractive composition comprising a carrier and a radiation reflective material comprising an ordered array of particles held in a matrix wherein a difference in refractive index between said matrix and said particles is at least about 0.01.
A method of fixing an array of particles in a matrix comprising the steps of:
- (a) providing a dispersion of similarly charged particles in a carrier to produce an ordered periodic array of the particles;
- (b) coating the array of particles with a matrix;
- and
- (c) fixing the array of particles within the matrix.
Dependencies are inferred from the claim text.