Title:
LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3527556
Kind Code:
B2
Abstract:
PURPOSE: To obtain a lubricating oil composition for internal combustion engine improving an oxidative deterioration life, capable of reducing of maintenance according to prolongation of oil charge interval and suitable as an engine oil for a co-generation system, etc., by mixing a base oil of a lubricating oil with a specific antioxidant and a specific ester.
CONSTITUTION: The objective composition is composed of a base oil of a lubricating oil, (A) a hindered phenolic-based antioxidant, or an amine-based antioxidant such as a dialkyldiphenylamine-based or a naphthylamine-based and (B) an ester derived from a substituted hydroxyaromatic carboxylic acid such as a compound expressed by the formula (Ar is a multifunctional aromatic nucleus; R is an organic group; (m) and (p) are each 1-3; (n) is 1-4) and a hydroxy compound such as an alkyl-substituted aromatic alcohol. Preferably, the objective composition contains a phosphoric acid ester-based antioxidant as an antioxidant together with the component A, and mixing amounts of the component A and B to whole amount of the composition are respectively 0.2-10wt.% and 0.1-20wt.%.
Inventors:
Goto, Masahisa
Nakamura, Hideyuki
Nakamura, Hideyuki
Application Number:
JP31101294A
Publication Date:
May 17, 2004
Filing Date:
December 14, 1994
Export Citation:
Assignee:
IDEMITSU KOSAN CO LTD
International Classes:
C10M141/02; C10M129/02; C10M141/06; C10M141/10; C10N30/10; C10N40/25; (IPC1-7): C10M129/02; C10M141/06; C10M141/10
Attorney, Agent or Firm:
大谷 保