Nippon Oil Fats Co., Ltd.

Kazuo Furuse

Tohru Yasukohchi

Shinya Okumura

Shin-ichi Akimoto

Kenichiro Minagawa

Yoshiharu Tanizaki

Heihachiro Okabe

A lubricating oil comprising a copolymer of monomers comprising as essential ingredients a compound represented by formula (1) and one of maleic anhydride, maleic acid, a salt of maleic acid, and an ester of maleic acid ##STR1## where Z represents a residue of a compound having from 2 to 8 hydroxyl groups; AO represents one or more kinds of oxyalkylene groups each having from 2 to 18 carbon atoms, provided that in the case of two or more kinds of oxyalkylene groups, the oxyalkylene groups are linked to one another in either a block or a random arrangement; R represents an alkenyl group having from 2 to 5 carbon atoms; R.sup.1 represents a hydrocarbon or acyl group having from 1 to 24 carbon atoms; and a.gtoreq.0, b.gtoreq.0, c.gtoreq.0, l is a positive integer, and m and n independently are 0 or a positive integer, provided that l+m+n=2 to 8, n/(l+m).ltoreq.1/2, and al+bm+cn=1 to 1,000.

Lubricating oil

An aqueous lubricant composition contains a first polyether component represented by the general formula I given below, a second polyether component expressed by the general formula II given below and a polyamide component represented by the general formula III. This composition exhibiting a highly advantageous viscosity behavior over a wide range of temperatures has a high resistivity against shearing stress and a superior storage stability, and is thus very suitable for use as a hydraulic fluid, metal drawing fluid, cutting fluid, press oil and the like even in the form of a high water base fluid having a water content over 80% by the components are weight: ##STR1## in which R.sup.1 represents a hydrocarbon group having 5-26 carbon atoms, R.sup.2 is a residue of a polyhydric alcohol, a polyhydric phenol or a polyamine each having 2-26 carbon atoms, R.sup.3 denotes a hydrocarbon group having obtained when a mono- or polycarboxylic acid having 8 to 54 carbon atoms is reacted with an alkanolamine or an alkylalkanolamine to form the formula III compound R.sup.4 represents hydrogen atom, a hydrocarbon group having 1-26 carbon atoms or a group expressed by (C.sub.s H.sub.2S O).sub.h H, Y stands for an oxygen or nitrogen atom, p and q represent an integer of 3 or 4, r and s denote an integer of 2 or 3, g and h represent each an integer from 1 to 20 and t is an integer from 1 to 5, wherein a.gtoreq.0, b.gtoreq.2, c.gtoreq.0, d&gt;0, e.gtoreq.0 and f&gt;0.

Aqueous lubricant composition

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Kanagawa, Japan

Kazuo Furuse