(19)
(11) EP 0 259 974 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.08.1988 Bulletin 1988/32

(43) Date of publication A2:
16.03.1988 Bulletin 1988/11

(21) Application number: 87307025

(22) Date of filing: 07.08.1987
(84) Designated Contracting States:
BE DE ES FR GB IT NL SE

(30) Priority: 08.08.1986 US 894599

(71) Applicant: CHEVRON RESEARCH COMPANY
 ()

(72) Inventor:
  • Liston, Thomas Vincent
     ()

   


(54) Overbased sulfurized alkyl-phenols as lubricating oil additives


(57) Oil-soluble hydrolytically stable Group II metal overbased sulfurized alkylphenol reaction products are characterized as possessing a Total Base Number of at least 300 and a viscosity of not more than 800 centistokes at 100°C and containing less than 10 mole percent of unsulfurized Group II metal alkylphenol in the actives. These reaction products, which are useful as lubricating oil additives, are obtained by a process in which the appropriate reactants are reacted together in the presence of a sulfurization catalyst which enables reaction products of such high Total Base Numbers and low viscosities to be obtained.





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