(19) |
 |
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(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: |
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16.03.1988 Bulletin 1988/11 |
(22) |
Date of filing: 07.08.1987 |
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|
(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.