Exxon Chemical Patents, Inc.

Graham W Hamey

Marc R Vernet

John F Marsh

A new overbased metal sulphonate composition comprises a mixture of (A) at least one long chain alkyl aryl sulphonate containing an average number of at least 40 carbon atoms in the alkyl residue and (B) at least one medium long chain alkyl aryl sulphonate containing an average number of 10 to 33 carbon atoms in the alkyl residue. The composition is useful as an additive to lubricant oil.

Overbased metal sulphonate composition

Overbased magnesium sulphonates having increased resistance to interactions are prepared from sulphonic acids prepared from alkylates with long and medium chain alkyl groups. Compositions comprising such overbased magnesium sulphonate are particularly suitable for use in combination with high molecular weight dispersants and/or friction modifiers. Stable sediment-free lubricating oil compositions (including lubricants and concentrates therefor) can be prepared which can meet SG quality and the Tier II fuel economy requirements.

Overbased magnesium sulphonate composition

A lubricant oil additive comprising a liquid vehicle and an overbased mixture of (A), a metal phenate, (B) a long chain metal alkyl aryl sulphonate and optionally, (C) a medium long chain metal alkyl aryl sulphonate shows an improved storage stability.

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Radley, United Kingdom

Graham W Hamey