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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2005/073353
Kind Code:
[PROBLEMS] To provide a biodegradable lubricating oil composition which has excellent biodegradability, has a high viscosity index, low pour point, and high flash point, and is satisfactory in lubricity, oxidative stability, property of preventing the corrosion of iron or nonferrous metals, and suitability for use with sealing materials. [MEANS FOR SOLVING PROBLEMS] The biodegradable lubricating oil composition comprises (A) a synthetic ester base oil comprising at least 50 wt.% 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 small base number, and (c) 0.01 to 1.0 mass% triazole compound, and has a 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.

Kawasaki, Hiroshi (24-4, Anesakikaigan Ichihara-sh, Chiba 07, 29901, JP)
Application Number:
Publication Date:
August 11, 2005
Filing Date:
January 28, 2005
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IDEMITSU KOSAN CO., LTD. (1-1 Marunouchi 3-chome, Chiyoda-ku Tokyo, 21, 10083, JP)
Kawasaki, Hiroshi (24-4, Anesakikaigan Ichihara-sh, Chiba 07, 29901, JP)
International Classes:
C10M105/34; C10M105/38; C10M129/10; C10M129/76; C10M133/44; C10M135/10; C10M159/24; C10M169/04; C10N10/04; C10N20/00; C10N20/02; C10N30/00; C10N30/02; C10N30/06; C10N30/08; C10N30/10; C10N30/12; C10N40/08; C10N40/20; C10N40/26; (IPC1-7): C10M169/04
Attorney, Agent or Firm:
Ohtani, Tamotsu (OHTANI PATENT OFFICE, Bridgestone Toranomon Bldg. 6F. 25-2, Toranomon 3-chom, Minato-ku Tokyo, 105-0001, JP)
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