Use of nanoparticulate organic pigments in paints and coatings
AssigneePPG Industries Ohio, Inc.
InventorsNoel R. Vanier, Calum H. Munro, Eldon L. Decker, Rachel B. Wilson, Matthew E. Wehrle
Life of this patent
Estimating the term…
Abstract
A protective and decorative coating composition including about 2 to 10 different colorants which in combination with a resinous composition produce a desired visible coating. A majority of the colorants has a maximum haze of about 10% and exhibits an absorbance peak in the visible spectrum wherein at least about 50% of the total absorbance in the visible spectrum occurs at wavelengths within about 50 nm of the wavelength of the peak absorbance.
Claims30
A method of color matching over the visible spectrum a preselected protective and decorative coating for applying to a substrate comprising the steps of:
- (a) determining the visible color of a preselected coating by measuring the absorbance or reflectance of the preselected coating;
- and
- (b) selecting a plurality of colorants which in combination with a resinous binder produce a coating composition which when deposited as a coating matches the visible color of the preselected coating, wherein said colorants are pigments and wherein a majority of the colorants has a maximum haze of 10% and exhibits an absorbance peak in the visible spectrum wherein at least 60% of the total absorbance in the visible spectrum occurs at wavelengths within about 50 nm of the wavelength of the peak absorbance.
A method of preparing a protective and decorative coating for applying to a substrate and having a preselected absorbance or reflectance over the visible spectrum comprising the steps of:
- (a) selecting a plurality of colorants, the colorants being pigments and a majority of the colorants having a haze of less than 10% and exhibiting an absorbance peak in the visible spectrum wherein at least 60% of the total absorbance in the visible spectrum occurs at wavelengths within about 50 nm of the wavelength of the peak absorbance;
- and
- (b) mixing the colorants with a resinous binder to produce a coating composition which when deposited as a coating matches the visible color of the preselected absorbance or reflectance.
Dependencies are inferred from the claim text.