Bonded metal-hydroxide-organic composite polymer films on lamellar pigments
AssigneeEngelhard Corporation
InventorsCarmine Vincent DeLuca, Jr., Jeannine M. Gale
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Abstract
Colored lustrous pigments of superior quality are prepared by dry blending a platy substrate such as a metal oxide-coated mica nacreous pigment and a hydrophobic colorant at low shear. The resulting blend exhibits a well dispersed, stable coloration, increased hydrophobicity and is particularly useful in industrial and automotive applications. The technique can also be employed to prepare pigments for cosmetic application.
Claims20
A colored lustrous pigment consisting essentially of a dry blend of platy substrate and hydrophobic colorant which exhibits a contact angle of water of at least 90° C., wherein said dry blend has not been subjected to shear conditions such that energy of more than about 20 J/cm3 was imparted to the blend.
A method of preparing a colored lustrous pigment comprising dry blending an admixture essentially of a dry blend of platy substrate and hydrophobic colorant under low shear conditions such that energy imparted to the blend is less than about 20 J/cm3.
Dependencies are inferred from the claim text.