Overbased magnesium oxide dispersions

US8580716B2 · kind B2 · utility

Assignee

• CHEMTURA CORPORATION · US

Inventors

• Qinggao Ma · Naugatuck, US
• Cyril A. Migdal · Pleasant Valley, US
• Kirk A. Schlup · Woodbury, US
• John-Louis DiFlavio · Mentor, US
• Ronald J. Muir · Peace River, CA

Key dates

• Filing date: Jun 23, 2011
• Grant date: Nov 12, 2013
• Expiry date: Jan 18, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2070/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Overbased MgO dispersions with high magnesium content and acceptably low viscosities are reproducibly prepared without gel formation by heating to 280-360° C. a mixture of MgO, selected dispersants, low MW carboxylic acids, water and a combination of high boiling hydrocarbon and organic diluent, wherein water is more than 8%, typically more than 10% of the reaction mixture. No additional solubilizing or dispersing agents, promoters or reactants such as carbon dioxide, amines, alcohols etc are needed to obtain the desired dispersions. Compositions such as lubricating oils and fuels containing the overbased magnesium dispersions as additives are also disclosed.