Back to results
US 6,855,674 B2Granted
Hydroxy aromatic Mannich base condensation products and the use thereof as soot dispersants in lubricating oil compositions
AssigneeInfineum International Limited
InventorAntonio Gutierrez
Life of this patent
Estimating the term…
Abstract
Low molecular weight oxazine ring-containing Mannich base condensates of hydroxy aromatic compounds, aldehyde; and amine. Such compounds are useful as soot dispersants in lubricating oils when used alone, or in combination with high molecular weight dispersants.
Claims15
A compound of the general formula (I):
- wherein:
- Ar is a polynuclear aromatic moiety;
- R1and R2 are independently selected from H and C1-C30 straight or branched chain hydrocarbyl groups optionally containing one or more hetero atoms selected from N, O and S;
- R3 is a straight or branched chain hydrocarbyl group;
- R4 is H or a C1 to C9 straight or branched chain hydrocarbyl group;
- q is 1 or 2;
- x is 1 to 3;
- y is from 1 to 2 times the number of aromatic rings in Ar;
- and
- z is zero to a number equal to the number of remaining substitutable hydrogens on aromatic moiety Ar;
- wherein
- a hydroxyl group attached to Ar combines with N—R1 to form a substituted or unsubstituted 6 membered oxazine ring, provided that, when z is 0, R2 is not H.
9 more elements
An oxazine ring-containing condensation product of (a) a polynuclear hydroxyaromatic compound optionally substituted with hydrocarbyl;
- (b) a C1-C10 aldehyde;
- and (c) an amine containing from 1 to 60 carbon atoms and from 1 to 12 nitrogen atoms per molecule.
A lubricating oil composition comprising a major amount of oil of lubricating viscosity and a minor amount of at least one compound of the general formula (I):
- wherein:
- Ar is mono- or polynuclear aromatic moiety;
- R1 and R2 are independently selected from H and C1-C30 straight or branched chain hydrocarbyl groups optionally containing one or more hetero atoms selected from N, O and S;
- R3 is a straight or branched chain hydrocarbyl group;
- R4 is H or a C1 to C9 straight or branched chain hydrocarbyl group;
- q is 1 or 2;
- x is 1 to 3;
- y is from 1 to 2 times the number of aromatic rings in Ar;
- and
- z is zero to a number equal to the number of remaining substitutable hydrogens on aromatic moiety Ar;
- wherein
- a hydroxyl group attached to Ar combines with N—R1 to form a substituted or unsubstituted 6 membered oxazine ring, provided that, when z is 0, R2 is not H.
9 more elements
Dependencies are inferred from the claim text.