Neutral and low overbased alkylphenoxy sulfonate additive compositions derived from alkylphenols prepared by reacting an olefin or an alcohol with phenol in the presence of an acidic alkylation catalyst
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 derived from alkylphenols prepared by alkylating phenol with an acidic alkylation catalyst having a Hammett (H.sub.o) acidity function of about -2.3 or less (more negative).
Claims22
A lubricating oil soluble, neutral and low overbased alkylphenoxy sulfonate additive composition having a viscosity of no more than about 1000 cSt at 100.degree. C. in the presence of 40 weight percent diluent oil wherein said diluent oil has a viscosity of from about 2 to about 10 cSt at 100.degree. C. which composition is prepared by the process of
- (a) forming a lubricating oil soluble alkylphenol by contacting an olefin or alcohol with phenol or a C.sub.1 to C.sub.7 alkylphenol in the presence of an acidic alkylation catalyst characterized as having a Hammett (H.sub.o) value of about -2.3 or less at a temperature of above about 90.degree. C. and under conditions sufficient to cause alkylation of the phenol wherein the olefin or alcohol has a sufficient number of carbon atoms to impart oil solubility to the resulting alkylphenol;
- (b) sulfonating the alkylphenol prepared in (a) above so as to produce an alkylphenol sulfonic acid;
- and
- (c) neutralizing the product prepared in (b) above with the sufficient amount of an alkaline earth metal base so that the resulting product has a TBN from 0 to about 100.
A method for reducing the viscosity of a lubricant additive composition comprising neutral and low overbased alkylphenoxy sulfonates which method comprises:
- (a) forming a lubricating oil soluble alkylphenol by contacting an olefin or alcohol with phenol or a C.sub.1 to C.sub.7 alkylphenol in the presence of an acidic alkylation catalyst having a Hammett (H.sub.o) value of about -2.3 or less at a temperature above about 90.degree. C. and under conditions sufficient to cause alkylation of the phenol wherein the olefin or alcohol has a sufficient number of carbon atoms to impart oil solubility to the resulting alkylphenol;
- (b) sulfonating the alkylphenol prepared in (a) above so as to produce an alkylphenol sulfonic acid;
- and
- (c) neutralizing the product prepared in (b) above 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.