Patent ID: 6756346
Filing Date: 2004-06-29
Classification: C10M,C10N

Abstract:
A lubricating oil composition comprising:(a) 100 parts by weight of a base oil for a lubricating oil; (b) as an antiwear agent: (i) (a) from 0.05 to 10 parts by weight of a phosphorothionate represented by formula (1), S&boxH;P(â€”Oâ€”R1)3â€ƒâ€ƒ(1) â€ƒwherein R1 represents an alkyl and/or an aryl group having from 1 to 30 carbon atoms; and, (b) from 0.01 to 1.0 part by weight of an amine salt of a phosphorus compound which phosphorus compound is represented by formula (2a), X&boxH;P(â€”XR2)2 XHâ€ƒâ€ƒ(2a) â€ƒwherein X represents a sulfur atom and/or an oxygen atom and R2 represents an alkyl and/or aryl group having from 2 to 30 carbon atoms; and/or (ii) from 0.05 to 10 parts by weight of a dithiophosphate represented by formula (3a); S&boxH;P(â€”Oâ€”R6)2(â€”Sâ€”Aâ€²)â€ƒâ€ƒ(3a) â€ƒwherein R6 represents an alkyl and/or aryl group having 1 to 30 carbon atoms and Aâ€² represents a hydrocarbon group optionally further containing one or more oxygen atoms; and, (c) as a rust preventing agent: from 0.01 to 1.0 part by weight of a polyalkylene polyamide obtained by reacting (a) a polyalkylene polyamine represented by formula (4a), R11(R12)â€”N(R10â€”NR13)mHâ€ƒâ€ƒ(4a) â€ƒwherein R10 represents an alkylene group having from 1 to 10 carbon atoms, R11, R12 and R13 each independently represent a hydrogen atom, an alkyl group having from 1 to 30 carbon atoms and/or a hydroxyalkyl group having from 1 to 30 carbon atoms, and m is an integer from 1 to 10; and, (b) a carboxylic acid having from 4 to 30 carbon atoms.