Nippon Oil Company

Nippon Zeon Company, Ltd.

Harima Chemicals, Incorporated

Michio Miyamoto

Shizuo Kitahara

Yutaka Shikatani

Yoshihide Ishikawa

Shinsuke Hasegawa

Jinichi Igarashi

Junichi Igarashi

An oil-soluble polyester having a weight average molecular weight of 10,000 to 1 000,000, which is a polycondensate prepared by polycondensing the following ingredients (A), (B) and (C):

Oil-soluble polyester, additive for lubricating oil, and lubricating oil

An oil-soluble polyester having a weight average molecular weight of 10,000 to 1,000,000, which is a polycondensate prepared by polycondensing the following ingredients (A) and (B): (A) a dicarboxylic acid ingredient, and (B) a diol ingredient comprising (i) a hindered glycol represented by the following formula: HO--CH.sub.2 --CR.sup.1 R.sup.2 --CH.sub.2 --OH wherein R.sup.1 and R.sup.2 independently represent a linear or branched alkyl group, and (ii) an alkylene glycol having at least 4 carbon atoms in the main chain. This oil-soluble polyester is useful as an additive for a lubricating oil.

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Kakogawa, Japan

Michio Miyamoto