Millennium Chemicals is a wholly owned subsidiary of Lyondell Chemical. With international operations and a strong technology base, Millennium Chemicals is the world's second-largest producer of titanium dioxide (TiO2), a product line that diversifies the Lyondell portfolio.

In addition, Millennium has leading market positions in its acetyls business, which is fully integrated with the Equistar ethylene product chain. Millennium is also the world's largest merchant seller of titanium tetrachloride and a major producer of silica gel and cadmium-based pigments.