(19)
(11) EP 0 365 287 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.07.1990 Bulletin 1990/27

(43) Date of publication A2:
25.04.1990 Bulletin 1990/17

(21) Application number: 89310665.8

(22) Date of filing: 17.10.1989
(51) International Patent Classification (IPC)5: C10M 145/16, C10M 149/06, C10M 159/12
(84) Designated Contracting States:
ES GR

(30) Priority: 18.10.1988 GB 8824380

(71) Applicant: BP CHEMICALS (ADDITIVES) LIMITED
London SW1W 0SU (GB)

(72) Inventor:
  • Slater, Barry
    Hedon Hull HU12 8DS (GB)

(74) Representative: Fawcett, Richard Fennelly et al
BP INTERNATIONAL LIMITED Patents & Agreements Division Chertsey Road
Sunbury-on-Thames Middlesex, TW16 7LN
Sunbury-on-Thames Middlesex, TW16 7LN (GB)


(56) References cited: : 
   
       


    (54) Lubricating oil additives


    (57) A lubricating composition comprises a major amount of an oil of lubricating viscosity and a minor amount of one or more carboxylic derivatives obtainable by reacting at least one substituted succinic acylating agent, which acylating agent comprises a copolymer of an aliphatic olefin and a monomer having the structure:

    X - - HC = CH - - X¹      (I)
    wherein X and X¹ are the same or different provided at least one of X and X¹ is such that the substituted succinic acylating agents can function as carboxylic acylating agents with a reactant selected from (a) an amine having within its structure at least one H-N group, (b) an alcohol, (c) a reactive metal or a reactive metal compound, and (d) a combination of two or more of any of (a) to (c).
    The preferred aliphatic olefin is a C₄-C₃₀ aliphatic olefin for example octadecene-1. The preferred monomer is maleic anhydride. Preferred amines comprises C₁₀-C₁₈ primary monoamines.










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