Engelhard Corporation

The Mearl Corporation

Carmine Vincent DeLuca, Jr

William P Kurtenbach

Christine Mans

Harold A Miller

Jeannine M Gale

William C Howard

Louis R Cerce

George R Waitkins

Highly reflective interference effect pigments with dark absorption color are obtained by reducing platy titanium dioxide. The present effect pigments may be used in cosmetics, plastics, inks, and coatings including solvent and water borne automotive paint systems.

Highly reflective interference pigments with dark absorption color

Optically variable interference pigments are composed of platelets of at least partly core-free titanium dioxide-coated substrate of about 1-25 mm particle size and an interference thickness of about 5-600 nm which have an oxide coating thereon.

Optically variable interference pigments

A pearlescent pigment comprising substrate particles having an adherent layer of rutile titanium dioxide thereon is prepared by effecting the deposition of hydrous titanium dioxide on the substrate particles after contacting the particles at elevated pH with titanium tetrachloride.

Rutile titanium dioxide effect pigments and production thereof

Pearlescent pigment having a chromium coating thereon and an iron oxide coating on the chromium coating are intensely colored, almost phosphorescently colored, and are highly reflective.

Interference pigments

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.

Bonded metal-hydroxide-organic composite polymer films on lamellar pigments

A lustrous interference pigment with a black absorption color is obtained by forming a mica coated with hydrous titanium, iron and cobalt or chromium oxides, calcining the coated mica and then coating the resulting product with hydrous titanium and/or iron oxides and calcining the resulting product.

Lustrous interference pigments with black absorption color

A pearlescent pigment comprising micaceous particles having an adherent layer of rutile titanium dioxide thereon is prepared by effecting the deposition of hydrous titanium dioxide on the micaceous particles in the presence of iron and calcium, magnesium and/or zinc ions without the use of tin.

Rutile titanium dioxide coated micaceous pigments formed without tin

Metal oxide coated mica pigments are provided with enhanced light and moisture stability by providing on the particle surfaces of coating of hydrous aluminum oxide.

Process for stabilizing metal oxide-coated mica pigments against light

Metal oxide coated mica pigments are provided with enhanced light and moisture stability by providing on the particle surfaces a coating of hydrous aluminum oxide.

Light and moisture resistant metal oxide-coated mica pigments

Nacreous pigment products comprising mica particles coated with translucent layers consisting essentially of titanium dioxide in the rutile form. A process for the preparation of such pigment products is disclosed, involving treatment with tin compounds, so that the TiO.sub.2 coating will crystallize mainly in the rutile form rather than as anatase during calcination of the pigment. The rutile-coated mica exhibits markedly enhanced light stability as compared with anatase-coated mica pigment products.

Growing community of inventors

Peekskill, NY, United States of America

Carmine Vincent DeLuca, Jr