(19)
(11) EP 0 712 925 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
31.07.1996 Bulletin 1996/31

(43) Date of publication A2:
22.05.1996 Bulletin 1996/21

(21) Application number: 95850199.1

(22) Date of filing: 10.11.1995
(51) International Patent Classification (IPC)6: C10M 169/04, C10M 173/02
// (C10M169/04, 105:14, 105:18, 107:34, 125:14, 129:40, 133:08),(C10M173/02, 129:08, 129:16, 129:40, 133:08, 145:26), C10N10:02, C10N40:24
(84) Designated Contracting States:
DE FR GB

(30) Priority: 21.11.1994 JP 311169/94

(71) Applicant: Nippon Oil Co., Ltd.
Tokyo (JP)

(72) Inventors:
  • Ogura, Shigetoshi
    Yokohama-shi, Kanagawa-ken (JP)
  • Seki, Katsumi
    Yokohama-shi, Kanagawa-ken (JP)
  • Yokota, Hideo
    Yokohama-shi, Kanagawa-ken (JP)
  • Shibata, Junichi
    Yokohama-shi, Kanagawa-ken (JP)
  • Natsume, Yoshitaka
    Yokohama-shi, Kanagawa-ken (JP)

(74) Representative: Modin, Jan et al
c/o Axel Ehrners Patentbyra AB Box 10316
S-100 55 Stockholm
S-100 55 Stockholm (SE)

   


(54) Lubricating oil composition


(57) A lubricating oil composition useful for metal rolling essentially comprises water added in the range of from 5 to 89.95 percent by mass; an oxygen-containing compound added in the range of from 10 to 94.95 percent by mass and represented by the formula

        R¹O-(R³-O)p-R   (I)


where R¹ and R each independently are hydrogen or hydrocarbon groups of 1-18 carbon atoms, R³ is an alkylene group of 1-6 carbon atoms, p is an integer of 1-30; and a salt of fatty acid added in the range of from 0.05 to 10 percent by mass and selected from the group consisting of an alkaline metal salt of fatty acid of 6-22 carbon atoms, a salt of fatty acid of 6-22 carbon atoms and an alkanol amine of 1-15 carbon atoms, and a salt of fatty acid of 6-22 carbon atoms and a nitrogen-containing compound of the formula


where R⁴ is a hydrocarbon group of 1-24 carbon atoms, R⁵ is an ethylene or propylene group, q is an integer of 1-30, X is hydrogen, a hydrocarbon group of 1-24 carbon atoms or a group of the formula -(R⁶-O)rH where R⁶ is an ethylene or propylene group and r is an integer of 1-30; the sum of the water and the compound of the formula (I) being in the range of from 80 to 99.95 percent by mass based on total composition.
The components as defined and their contents as specified are conducive to improved rolling performance and high surface gloss of rolled products.





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