Neutral and low overbased alkylphenoxy sulfonate additive compositions
AssigneeChevron Research and Technology Company
InventorsRobert H. Wollenberg, Richard J. Nelson, John McDonald, Susanne G. Ruelas, Curtis B. Campbell, Kathryn E. Matera
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Abstract
This invention is directed to neutral and low overbased alkylphenoxy sulfonates having a dialkyl content sufficient to provide an essentially neutral alkylphenoxy sulfonate having a viscosity no greater than about 1000 cSt at a temperature of 100.degree. C. in the presence of 40 weight percent diluent oil.
Claims32
A lubricating oil soluble, low viscosity, neutral and low overbased alkylphenoxy sulfonate additive composition having a viscosity of no more than about 1000 cSt at 100.degree. C. when the composition contains 40 weight percent of diluent oil wherein said diluent oil has a viscosity of about 2 to about 10 cSt at 100.degree. C. and further wherein the alkyl group(s) on the alkylphenoxy sulfonate are substantially straight chain.
A method for reducing the viscosity of a lubricant additive composition comprising neutral and low overbased alkylphenoxy sulfonates which method comprises the steps of:
- (a) preparing an alkylphenol composition containing a dialkyl content of at least 10 percent wherein the alkyl group(s) of the alkylphenol are derived from substantially straight-chain olefins or alcohols having a sufficient number of carbon atoms to impart oil solubility to the alkylphenol;
- (b) sulfonating the alkylphenol composition prepared in step (a) above so as to produce an alkylphenol sulfonic acid;
- and
- (c) reacting the product of step (b) with a sufficient amount of an alkaline earth metal base so that the resulting product has a TBN from 0 to about 100.
Dependencies are inferred from the claim text.