# US 4,396,516 A · Lubricant

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- Number: US 4,396,516 A
- Document ID: US4396516A
- Status: Granted
- Kind: A
- Application number: 06/261,155
- Filed: 1981-06-09
- Granted: 1983-08-02
- Earliest claimed: 1979-10-09
- Assignees: Nippon Oil Co., Ltd.
- Inventors: Hirotsugu Kinoshita; Hiroshi Uemura; Makoto Sekiya; Kazuyoshi Mitamura
- Web page: https://patentgrep.com/patent/US4396516A

## CPC

- C10M 133/16: Amides; Imides
- C10M 2215/04: having amino groups bound to acyclic or cycloaliphatic carbon atoms
- C10M 2215/086: Imides [having hydrocarbon substituents containing less than thirty carbon atoms]
- C10M 2215/26: Amines
- C10M 2215/28: Amides; Imides
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)

## Abstract

This invention is a lubricant comprising an imide compound obtained by reacting a dibasic acid selected from the group consisting of succinic acid, maleic acid, glutaric acid and phthalic acid with a primary amine having a C.sub.8 -C.sub.18 hydrocarbon radical. The lubricant of the invention may be used in combination with a specified diamine derivative and known lubricant additives, and exhibits excellent lubricating properties.

## Claims

### Claim 1

A lubricant comprising a diamide derivative of the formula ##STR4## wherein R.sub.5 represents a C.sub.14 -C.sub.18 alkyl or alkenyl radical and a as a base lubricant an imide compound selected from the group consisting of imide compounds having the following formulas ##STR5## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represent a C.sub.8 -C.sub.18 saturated or unsaturated hydrocarbon radical, said imide compound being obtained by the reaction of a dibasic acid selected from the group consisting of succinic acid, maleic acid, glutaric acid and phthalic acid or the anhydride thereof with at least one primary amine having a corresponding C.sub.8 -C.sub.18 hydrocarbon radical at 100.degree. to 180.degree. C. under atmospheric pressure in a mole ratio of the dibasic acid to the primary amine of from 1:1 to 1:less than 2.

### Claim 2 (depends on 1)

The lubricant according to claim 1 wherein said diamide derivative is present in an amount of up to 30% by weight.

### Claim 3

A method for preparing lubricants characterized by the step of using as an oil base thereof an acid imide compound of the formula ##STR6## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represent a C.sub.8 -C.sub.18 saturated or unsaturated hydrocarbon radical, said imide compound being obtained by the reaction of a dibasic acid selected from the group consisting of succinic acid, maleic acid, glutaric acid and phthalic acid or the anhydride thereof with at least one primary amine having a corresponding C.sub.8 -C.sub.18 hydrocarbon radical at 100.degree. to 180.degree. C. under atmospheric pressure in a mole ratio of the dibasic acid to the primary amine of from 1:1 to 1 to 1: less than 2.