| (19) |
 |
|
(11) |
EP 0 310 346 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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14.06.1989 Bulletin 1989/24 |
| (43) |
Date of publication A2: |
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05.04.1989 Bulletin 1989/14 |
| (22) |
Date of filing: 28.09.1988 |
|
| (51) |
International Patent Classification (IPC)4: C10M 101/00, C10M 169/04
// (C10M169/04, 101:00, 129:10, 133:12, 135:20, 137:10), C10N30:10, C10N40:04, C10N60:02 |
|
| (84) |
Designated Contracting States: |
|
DE FR GB IT NL |
| (30) |
Priority: |
28.09.1987 JP 240620/87
|
| (71) |
Applicant: NIPPON STEEL CHEMICAL CO., LTD. |
|
Tokyo (JP) |
|
| (72) |
Inventors: |
|
- Uchiyama, Hiromitsu
Higashimurayama-shi
Tokyo (JP)
- Komoto, Tadashi
Kitakyushu-shi
Fukuoka-ken (JP)
- Urata, Yuichi
Kitakyushu-shi
Fukuoka-ken (JP)
- Tezuka, Takeshi
Sendai-shi
Miyagi-ken (JP)
|
| (74) |
Representative: Rees, David Christopher et al |
|
Kilburn & Strode
30 John Street
London WC1N 2DD
London WC1N 2DD (GB) |
|
| |
|
| (54) |
Composition suitable for traction drives and process for operating the same |
(57) The present invention discloses a composition suitable for use in traction drives,
which comprises a small amount of an antioxidant in combination with a naphthenic
oil having as a main component thereof a condensed polycyclic alicyclic hydrocarbon
resulting from the hydrogenation of a hydrocarbon oil obtained by decomposing a coat
type raw material oil. The sum of the carbon atoms of the condensed polycyclic alicyclic
hydrocarbon and the carbon atoms directly bonded to the polycyclic moiety accounts
for not less than 80% of the total number of carbon atoms of the naphthenic oil and
the hydrogen/carbon atomic ratio (H/C) of the naphthenic oil is in the range of 1.68
to 1.80.