BIODEGRADABLE LUBRICATING OIL COMPOSITION

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(11)

EP 1 707 617 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	published in accordance with Art. 158(3) EPC

(15)	Correction information:
	Corrected version no 1 (W1 A1)

(48)	Corrigendum issued on:
	06.12.2006 Bulletin 2006/49

(43)	Date of publication:
	04.10.2006 Bulletin 2006/40

(21)	Application number: 05709443.5

(22)	Date of filing: 28.01.2005

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International Patent Classification (IPC):

C10M 169/04^(2006.01)
C10M 105/38^(2006.01)
C10M 129/10^(2006.01)
C10M 133/44^(2006.01)
C10M 159/24^(2006.01)
C10N 20/00^(2006.01)
C10N 30/00^(2006.01)
C10N 30/06^(2006.01)
C10N 30/10^(2006.01)
C10N 40/04^(2006.01)
C10N 40/20^(2006.01)

C10M 169/04^(2006.01)
C10M 105/40^(2006.01)
C10M 133/38^(2006.01)
C10M 135/10^(2006.01)
C10N 10/04^(2006.01)
C10N 20/02^(2006.01)
C10N 30/02^(2006.01)
C10N 30/08^(2006.01)
C10N 30/12^(2006.01)
C10N 40/08^(2006.01)

(86)	International application number:
	PCT/JP2005/001216

(87)	International publication number:
	WO 2005/073353 (11.08.2005 Gazette 2005/32)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

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Priority:

30.01.2004 JP 2004024291

(71)	Applicant: IDEMITSU KOSAN CO., LTD.
	Tokyo 100-8321 (JP)

(72)	Inventor:
	KAWASAKI, Hiroshi Ichihara-shi, Chiba 2990107 (JP)

(74)	Representative: Gille Hrabal Struck Neidlein Prop Roos
	Patentanwälte Brucknerstrasse 20 40593 Düsseldorf 40593 Düsseldorf (DE)

(54)	BIODEGRADABLE LUBRICATING OIL COMPOSITION

(57) [PROBLEMS] To provide a biodegradable lubricating oil composition which has excellent biodegradability, a high viscosity index, a low pour point, a high flash point, being satisfactory with lubricity, oxidative stability, property of preventing the corrosion of iron and non-ferrous metals, and suitability for use with sealing materials.
[MEANS FOR SOLVING THE PROBLEMS] A biodegradable lubricating oil composition comprising (A) a synthetic ester base oil comprising at least 50 mass% hindered ester of an aliphatic monocarboxylic acid with an aliphatic hindered polyol which has one or more quaternary carbon atoms per molecule and in which at least one of the quaternary carbon atoms has one to four methylol groups bonded thereto and (B) ingredients which are (a) 0.1 to 5.0 mass% phenolic antioxidant, (b) 0.01 to 2.0 mass% calcium sulfonate having a low base number, and (c) 0.01 to 1.0 mass% triazole compound, and has the degree of biodegradation of 60 % or higher when examined by the test for the degree of microbial degradation of chemical substances according to the OECD Test Guideline 301C method.