EP0305538A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Lubricating oil composition

Assignee: Idemitsu Kosan Co Ltd

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Filing: 1988-02-29

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Granted: —

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Expires: 2008-02-29

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Abstract

Abstract A lubricating oil composition prepared by incorporating (A) 0.05 to 5 wt % of an alkenylsuccinic acid ester and/or an alkylsuccinic acid ester and (B) 0.005 to 5 wt % of a fatty acid ester of a polyhydric alcohol in a base oil. This composition has low frictional characteristics, i.e., a small ratio of the static friction coefficient to the dynamic friction coefficient and gives a less shock upon gear changes. In addition, it undergoes less changes in frictional characteristics with the temperature change or with the lapse of time. Therefore, it is well adapted for reduction in the size of, for example, a transmission.Thus,the lubricating oil composition is extremely effective as the lubricating oil for an automatic transmission, a part having a wet clutch or wet brake of, for example, tractors, and the like.

Inventors

👤 Masashi Dasai
👤 Tsutomu Akita
👤 Masaharu Sasaki

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-09 13:31

CPC Classifications

C; C10; C10M; C10M105/00; C10M105/08; C10M105/32; C10M141/00; C10M141/08; C10M101/00; C10M101/02; C10M105/02; C10M105/04; C10M129/00; C10M129/02; C10M129/68; C10M129/72; C10M129/74; C10M129/76; C10M129/86; C10M129/95; C10M133/00; C10M133/02; C10M133/16; C10M133/52; C10M133/56; C10M135/00; C10M135/20; C10M135/22; C10M135/24; C10M135/26; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C10M161/00; C10M169/00; C10M169/04; C10M169/044; C10M2203/00; C10M2203/02; C10M2203/022; C10M2203/024; C10M2203/04; C10M2203/045; C10M2203/10; C10M2203/1006; C10M2203/102; C10M2203/1025; C10M2203/104; C10M2203/1045; C10M2203/106; C10M2203/1065; C10M2203/108; C10M2203/1085; C10M2205/00; C10M2205/02; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/024; C10M2207/026; C10M2207/027; C10M2207/028; C10M2207/10; C10M2207/14; C10M2207/144; C10M2207/146; C10M2207/26; C10M2207/262; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/285; C10M2207/286; C10M2207/287; C10M2207/288; C10M2207/289; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/103; C10M2209/109; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/08; C10M2215/082; C10M2215/086; C10M2215/12; C10M2215/122; C10M2215/24; C10M2215/26; C10M2215/28; C10M2217/00; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/02; C10M2219/022; C10M2219/04; C10M2219/044; C10M2219/046; C10M2219/06; C10M2219/062; C10M2219/066; C10M2219/068; C10M2219/08; C10M2219/082; C10M2219/084; C10M2219/085; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10M2227/00; C10M2227/06; C10M2227/061; C10N; C10N2010/00; C10N2010/04; C10N2040/00; C10N2040/02; C10N2040/04; C10N2040/042; C10N2040/044; C10N2040/046; C10N2040/08

Claims Analysis

Total Claims: 3

Claim 1

Independent Claim 51 words

A lubricating oil composition characterized in that the base oil contains (A) from 0.05 to 5% by weight of an ester of alkenyl substituted succinic acid and/or an ester of alkyl substituted succinic acid and (B) from 0.005 to 5% by weight of a fatty acid ester of a polyhydric alcohol.

Claim 2

Dependent Claim 51 words

Claim 3

Dependent Claim 21 words

The lubricating oil composition as claimed in Claim 1 wherein the base oil contain 0.5% by weight or less of sulfur.

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