Lubricating oil for ship propulsor bearings

Details Lubricating oil for ship propulsor bearings Lubricating oil for ship propulsor bearings

2006-02-16

2010-02-23

Caldarola, Glenn A (Department: 1797)

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Organic oxygen compound

C508S459000, C508S545000, C508S539000, C508S577000

Reexamination Certificate

active

07666822

ABSTRACT:
The present invention has its object to provide a lubricating oil for ship propulsor bearings which is high in bearing-damaging pressure, equivalent in lubricity and anticorrosiveness to the conventional mineral oil-based lubricating oils, higher in biodegradability than in the art and miscible with seawater. The present invention provides a lubricating oil for ship propulsor bearings which comprises a water-soluble alkylene glycol and/or polyalkylene glycol (A) with a number average molecular weight of not higher than 1,000 as a base oil as well as a water-soluble thickening agent (B) and a water-soluble anticorrosive agent (C) and in which the content of (A) is 80 to 98% by weight, that of(B) is 1 to 10% by weight and that of(C) is 1 to 10% by weight, relative to the weight of the lubricating oil for ship propulsor bearings and the bearing-damaging pressure at 50° C. is not lower than 3.5 MPa.

REFERENCES:
patent: 3970574 (1976-07-01), Niedzielski
patent: 6054422 (2000-04-01), Ward et al.
patent: 2004/0235679 (2004-11-01), Kurosky et al.
patent: 1081294 (1967-08-01), None
patent: 53139065 (1978-12-01), None
patent: 5-331481 (1993-12-01), None
patent: 11-323373 (1999-11-01), None
patent: WO 2004/053031 (2004-06-01), None
European Search Report dated Aug. 4, 2008; Application No. 06003292.7-2104 / 1705236.

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