Lubricating oil having an average ring number of less than 1.5 per mole containing a succinic anhydride amine rust inhibitor

• US 5,225,094 A
• Filed: 12/18/1991
• Issued: 07/06/1993
• Est. Priority Date: 12/18/1991
• Status: Expired due to Fees

• Current Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Original Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Inventors: MacAlpine, Gerald A., Pillon, Lilianna Z., Asselin, Andre E.
• Primary Examiner(s): JOHNSON, JERRY D
• Application Number:
  US07/809,907
• Time in Patent Office: 566 Days
• Field of Search: 252/51.5 R
• US Class Current: 508/306
• CPC Class Codes: C10M 101/02 Petroleum fractions
• CPC Class Codes: C10M 107/10 containing aliphatic monomer having more than 4 carbon atoms
• CPC Class Codes: C10M 129/42 polycarboxylic
• CPC Class Codes: C10M 133/06 having amino groups bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 133/16 Amides; Imides
• CPC Class Codes: C10M 141/06 at least one of them being an organic nitrogen-containing compound
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• CPC Class Codes: C10M 2203/1006 used as base material
• CPC Class Codes: C10M 2203/1025 used as base material
• CPC Class Codes: C10M 2203/1045 used as base material
• CPC Class Codes: C10M 2203/1065 used as base material
• CPC Class Codes: C10M 2203/1085 used as base material
• CPC Class Codes: C10M 2205/0285 used as base material
• CPC Class Codes: C10M 2207/123 polycarboxylic
• CPC Class Codes: C10M 2207/127 polycarboxylic
• CPC Class Codes: C10M 2207/129 having hydrocarbon chains of thirty or more carbon atoms
• CPC Class Codes: C10M 2207/22 Acids obtained from polymerised unsaturated acids
• CPC Class Codes: C10M 2215/04 having amino groups bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2215/08 Amides
• CPC Class Codes: C10M 2215/082 containing hydroxyl groups; Alkoxylated derivatives
• CPC Class Codes: C10M 2215/086 : Imides
• CPC Class Codes: C10M 2215/12 : Partial amides of polycarboxylic acids
• CPC Class Codes: C10M 2215/122 : Phtalamic acid
• CPC Class Codes: C10M 2215/26 : Amines
• CPC Class Codes: C10M 2215/28 : Amides; Imides
• CPC Class Codes: C10N 2040/02 : Bearings
• CPC Class Codes: C10N 2040/04 : Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• CPC Class Codes: C10N 2040/042 : for automatic transmissions
• CPC Class Codes: C10N 2040/044 : for manual transmissions
• CPC Class Codes: C10N 2040/046 : for traction drives
• CPC Class Codes: C10N 2040/135 : Steam engines or turbines
• CPC Class Codes: C10N 2040/25 : Internal-combustion engines
• CPC Class Codes: C10N 2040/251 : Alcohol fueled engines
• CPC Class Codes: C10N 2040/252 : Diesel engines
• CPC Class Codes: C10N 2040/253 : Small diesel engines
• CPC Class Codes: C10N 2040/255 : Gasoline engines
• CPC Class Codes: C10N 2040/26 : Two-strokes or two-cycle engines
• CPC Class Codes: C10N 2040/28 : Rotary engines

Abstract

The rust inhibition capability of a lubricating oil having an average ring number per mole of less than 1.5 can be enhanced by adding a rust inhibitor that is capable of reducing the oil/water interfacial tension to between about 1 to about 4 mN/m.

Claims

1. A lubricating oil for inhibiting the formation of rust which comprises

(a) a hydrocarbon lubricating oil basestock having an average ring number per mole of less than 1.5, and

(b) at least about 0.06 wt% of an oil soluble rust inhibitor capable of reducing the interfacial tension between the oil and water in the oil to about 1 to about 4 mN/m wherein the oil soluble rust inhibitor is a succinic anhydride amine.

2. The oil of claim 1 wherein the average ring number per mole in (a) is less than 0.5.

3. The oil of claim 2 wherein the amount of (b) ranges from about 0.06 to about 0.25 wt.%.

4. The oil of claim 3 wherein the average ring number per mole in (a) is 0.3 or less.

5. A method of inhibiting the formation of rust in an internal combustion engine which comprises operating the engine with the lubricating oil of claim 1.

6. The method of claim 5 wherein the average ring number per mole in (a) is less than 0.5.