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AssigneeAlliedSignal Inc.
InventorsTammy Lynn Smith, Ray Baughman, Mary Frances Martin, Wonsik Choi, Jeffrey Moulton
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This invention provides improved methods and compositions for achieving material coloration using particle scattering. These coloration effects can be designed to be either highly stable or dependent upon the switching effects of either temperature, integrated thermal exposure, moisture absorption, or exposure to actinic radiation. Articles employing materials with these coloration effects are described Composition comprise a solid, light-transmitting matrix component having a non-liquid particle scattering colorant dispersed. Articles are produced wherein another solid second matrix component has an electronic transition colorant dispersed therein and the first and second compositions are disposed on one another and optionally interpenetrate each other. Colored articles are produced in the form of fibers, films and molded articles.
A process of making a fiber comprising melt spinning a hollow polymeric fiber and dyeing the cavity of the hollow fiber using a solution.
A process for the manufacture of colored polymer fibers comprising forming a dispersion of a particle scattering colorant having an average particle size of less than 0.2 microns with a polymer matrix in the gel state and then subjecting the dispersion to fiber spinning, wherein the average refractive index of the particle scattering colorant differs from that of the polymer matrix by at least about 10% in the visible wavelength range, and the particle scattering colorant, when dispersed in a colorless, isotropic liquid having a substantially different refractive index, is characterized at visible wavelengths as having an effective maximum absorbance that is at least about 2 times the effective minimum absorbance.
Dependencies are inferred from the claim text.