| (19) |
 |
|
(11) |
EP 1 057 883 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
24.01.2001 Bulletin 2001/04 |
| (43) |
Date of publication A2: |
|
06.12.2000 Bulletin 2000/49 |
| (22) |
Date of filing: 01.06.2000 |
|
| (51) |
International Patent Classification (IPC)7: C10M 141/10
// (C10M141/10, 125:26, 135:04, 135:06, 137:02, 137:04, 137:10), C10N10:04, C10N30:06,
C10N40:04 |
|
| (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: |
01.06.1999 JP 15353099
|
| (71) |
Applicant: ORONITE JAPAN LIMITED |
|
Tokyo (JP) |
|
| (72) |
Inventors: |
|
- Ohsawa, Mitsuo
Haibara-gun, Shizuoka (JP)
- Yan, Shengchun
Singapore, 650525 (SG)
- Ishigami, Motoi
Haibara-gun, Shizuoka (JP)
|
| (74) |
Representative: Nash, David Allan et al |
|
Haseltine Lake & Co., Imperial House, 15-19 Kingsway
London WC2B 6UD
London WC2B 6UD (GB) |
|
| |
|
| (54) |
Gear lubricating oil composition |
(57) A gear lubricating oil composition comprising a base oil of lubricating viscosity
having dissolved or dispersed therein an alkali metal borate or a hydrate thereof
in an amount of 0.04 to 1.0 wt % in terms of boron content, an oil-soluble sulfur-containing
extreme pressure agent in an amount of 0.01 to 5.0 wt % in terms of sulfur content,
an oil-soluble phosphorus-containing extreme pressure agent in an amount of 0.001
to 1.0 wt % in terms of phosphorus content, and a zinc dialkyldithiophosphate in an
amount of 0.01 to 1.0 wt % in terms of phosphorus content.