Low phosphorous engine oil compositions and additive compositions
AssigneeOronite Japan Limited
InventorsMorikuni Nakazato, Jiro Magarifuchi, Yoshifumi Isozaki
Life of this patent
Estimating the term…
Abstract
An engine oil composition which comprises a metal-containing detergent, zinc dithiophosphate, and a boron-containing ashless dispersant dissolved or dispersed in a base oil; characterized by further containing an antiwear agent having an aliphatic amide compound and either a dithiocarbamate compound or an ester derived from a fatty acid and boric acid.
Claims9
A low-phosphorous lubricating oil composition for internal combustion engines comprising:
- (a) a major amount of a base oil of lubricating viscosity,
- (b) from 0.5 to 20 wt. % of metal-containing detergent,
- (c) from 0.1 to 3 wt. % of a secondary zinc dithiophosphate,
- (d) from 0.5 to 15 wt. % of boron-containing ashless dispersant, and
- (e) from 0.05 to 2 wt. % of an antiwear agent comprising:
- (i) an oleic amide, and
- (ii) a compound selected from the group consisting of:
- (1) a molybdenum dithiocarbamate, and
- (2) an ester derived from glycerol, boric acid, and a fatty acid having 8-24 carbon atoms, wherein the ester is selected from the group consisting of:
- (a) an ester having the formula:
- ##STR5## (b) an ester having the formula:
- ##STR6## wherein X, Y, and Z are the same or different and each represents a group selected from the group consisting of a hydroxyl group and an alkylcarboxyl group.
A low-phosphorous lubricating oil composition for internal combustion engines comprising:
- (a) a major amount of a base oil of lubricating viscosity,
- (b) from 0.5 to 20 wt. % of metal-containing detergent,
- (c) from 0.1 to 3 wt. % of zinc dithiophosphate,
- (d) from 0.5 to 15 wt. % of boron-containing ashless dispersant, and
- (e) from 0.05 to 2 wt. % of an antiwear agent comprising:
- (i) an oleic amide, and
- (ii) a molybdenum dithiocarbamate.
A low-phosphorous lubricating oil composition for internal combustion engines comprising:
- (a) a major amount of a base oil of lubricating viscosity,
- (b) from 0.5 to 20 wt. % of metal-containing detergent,
- (c) from 0.1 to 3 wt. % of a secondary alkyl zinc dithiophosphate,
- (d) from 0.5 to 15 wt. % of boron-containing ashless dispersant, wherein the boron-containing ashless dispersant is a succinimide derivative that comprises 0.2 to 2 wt. % boron, and
- (e) from 0.05 to 2 wt. % of an antiwear agent comprising:
- (i) an oleic amide, and
- (ii) an ester derived from glycerol, boric acid and a fatty acid having 8 to 24 carbon atoms, wherein the ester is selected from the group consisting of:
- (1) an ester having the formula:
- ##STR7## (2) an ester having the formula:
- ##STR8## wherein X, Y, and Z are the same or different and each represents a group selected from the group consisting of a hydroxyl group and an alkylcarboxyl group.
An additive concentrate comprising:
- (a) 100 weight parts of a metal-containing detergent,
- (b) from 10 to 700 weight parts of a boron-containing ashless dispersant,
- (c) from 1 to 200 weight parts of an antiwear agent comprising:
- (i) an oleic amide, and
- (ii) a compound selected from the group consisting of:
- (1) a molybdenum dithiocarbamate, and
- (2) an ester derived from glycerol, boric acid, and a fatty acid having 8-24 carbon atoms, wherein the ester is selected from the group consisting of:
- (a) an ester having the formula:
- ##STR9## (b) an ester having the formula:
- ##STR10## wherein X, Y, and Z are the same or different and each represents a group selected from the group consisting of a hydroxyl group and an alkylcarboxyl group,
- (d) a secondary alkyl zinc dithiophosphate, and
- (e) a base oil.
Dependencies are inferred from the claim text.