(19)
(11) EP 0 978 554 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.03.2000 Bulletin 2000/10

(43) Date of publication A2:
09.02.2000 Bulletin 2000/06

(21) Application number: 99305884.1

(22) Date of filing: 26.07.1999
(51) International Patent Classification (IPC)7C10M 101/02, C10M 169/04
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 04.08.1998 GB 9816951

(71) Applicant: ETHYL PETROLEUM ADDITIVES LIMITED
Bracknell, Berkshire RG12 2UW (GB)

(72) Inventors:
  • Walters, David Kenvyn
    Camberley, Surrey GU46 7TR (GB)
  • Ryan, Helen Theresa
    London W6 8NL (GB)

(74) Representative: Cresswell, Thomas Anthony 
J.A. KEMP & CO. 14 South Square Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB)

   


(54) Turbine and R&O oils containing neutral rust inhibitors


(57) A composition suitable for use as a turbine or rust and oxidation (R&G) oil comprising a major portion of a base oil and (A) at least one neutral rust inhibitor, wherein the base oil has a viscosity index of greater than 80, a saturates content of greater than 90 wt% and a sulfur content of 0.5 wt% or less providing improved filterability.
Further improved hydrolytic stability may be obtained by the addition of (B) a compound of the formula:







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