Millennium Inorganic Chemicals, Inc.

Cristal Usa, Inc.

David E Bell

Modasser El-Shoubary

Robert M Hopkins

Karen L Bowen

Fu-Chu Wen

Deborah E Busch

Richard L Fricker

Robert Provins

Brian David Kiessling

A composition includes polymer and dispersed infrared-reflective clusters of titanium dioxide primary particles. The titanium dioxide primary particles are cemented together with precipitated silica and/or alumina to form clusters. The titanium dioxide primary particles have an average particle diameter in the range of from about 0.15 to about 0.35 micron, while the clusters of titanium dioxide primary particles have an average cluster diameter in the range of from about 0.38 to about 5 microns and a geometric standard deviation (GSD) in the range of from about 1.55 to about 2.5.

Infrared-reflective coatings

In various embodiments, a pigment composition is provided comprising a base particle and a dispersing agent, the dispersing agent comprising a salt and/or ester of: (i) an amine, alcohol, and/or alkanol amine and (ii) a polyprotic acid, wherein the mole ratio of the amine, alcohol, and/or alkanol amine to the polyprotic acid is greater than 3:1. In various embodiments, the pigments have improved stability, hiding power, tint strength, and/or gloss.

Compositions and methods comprising pigments and polyprotic dispersing agents

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Glen Burnie, MD, United States of America

David E Bell