METAL ROLLING OIL COMPOSITION

PURPOSE:To improve liq. circulation stability without decreasing the amt. of plate-out, by adding a particular polymer compd. to a lubricating oil component. CONSTITUTION:A lubricating oil component (a) selected from among animal and vegetable oils and fats, mineral oils and fatty acid esters is mixed with 0.1-10wt.%, based on the amt. of component (a), polymer compd. (b) selected from among an alpha-olefin-maleic acid copolymer (i) having repeating units of formula I (wherein R is a 1-50C straight-chain or branched alkyl; at least one of A's is formula II and the other is OH, formula III or IV, OR , -OM, -NHR or -NR R ; n1 is 10-3000; m1 is 2-10; m2 is 1-20; m3 is 1-10; each of R and R is H or CH3; each of R and R is H or a 1-4C alkyl; each of R and R is a 1-20C straight-chain or branched alkyl; and each of R and R is H or R ), an alpha-olefin-maleic acid copolymer (ii) having repeating units of formula V (wherein B is a 1-10C straight-chain or branched alkyl or -R -O-R -; and each of R and R is a 1-4C alkyl) and a polymer compd. (iii) obtd. by imidization of a polymer material of formula VI with an amine compd. selected from among N-aminoethylpiperidine, N-aminopropylpiperidine, 2-aminopyridine, 3-picolylamine, etc.