PURPOSE: To provide the subject additive homogeneously dissolved or stably dispersed in lubricants such as lubricating oils or greases, not causing corrosion, not producing sludges and imparting high load resistance, high electric insulation and low hygroscopicity to the lubricants by incorporating a specific fluorinated polyether into the additive.
CONSTITUTION: The objective additive comprises a fluorinated polyether of formula I (Rf is a group containing a fluoroalkylpolyether group; X is CF2COO-, C2F4COO- or -CF2CF2-; A is a group containing a polyoxyalkylene group). The fluorinated polyether is preferably a compound of formula II [Y is F, CaF2a+1O (a is 1-3); R is H or 1-20C alkyl; l, m, n, p and q are satisfied with the inequali ties 0≤p≤100, 0≤q≤100, 2≤l+m+n≤200, and l+m≥1].
KATAOKA YOSHIAKI
ISHIKAWA SUEYOSHI
YAMAMOTO IKUO
