Abstract:
A process for producing a lubricating oil dispersant additive comprises:step (1) reacting compound (A), wherein compound (A) is a hydrocarbyl-substituted or a substituted hydrocarbyl-substituted succinic acid or anhydride or ester thereof, with compound (B) of formula (I)H.sub.2 N(CHR.sup.1 CHR.sup.2 O).sub.n CHR.sup.3 CHR.sup.4 NH.sub.2 (I) wherein one R.sup.2 and R.sup.2 is hydrogen and the other is hydrogen or a lower alkyl group and n is an integer from 1 to 10 and one of R.sup.3 and R.sup.4 is hydrogen and the other is hydrogen or a lower alkyl group, each of the --(CHR.sup.1 CH.sup.2 O)--units being independently defined, to give a product (C) andstep(2) reacting product (C) with a diisocyanate (D) of formula (II)OCN--R.sup.5 --NCO (II) wherein R.sup.5 is a divalent organic group. Novel succinimides have been prepared by the disclosed process, lubricating oil compositions comprise 1-20% w/w of the modified succinimdes. The succinimides have dispersancy and VI improver properties.
Abstract:
A marine diesel cylinder is lubricated using a lubricant having a total base number (TBN) of at least about 25, comprising an oil of lubricating viscosity and a metal-containing detergent component. Forty to 90 percent of the TBN derived from the metal-containing detergent component is provided by calcium detergent; 5 to 40 percent of the TBN by sodium detergent; and 5 to 45 percent by magnesium detergent. At least 50 weight percent of the total detergent substrate is sulfonate and less than 50 weight percent is monomeric or oligomeric substrate comprising one or more units of alkyl-substituted phenol having an alkyl group of 8 to 14 carbon atoms. The lubricant is useful when the marine diesel engine is fueled with a liquid fuel containing at least 2 ppm vanadium.
Abstract:
A turbo-charged, sump-lubricated internal combustion engine which is susceptible to contamination of lubricant with liquid fuel, may be lubricated with a lubricant which contains an amount of a rust inhibitor effective to reduce the deterioration of said lubricant and turbo sludge formation.
Abstract:
The present invention relates to a lubricating composition, particularly marine diesel engine lubricating compositions, comprising: (a) an oil of lubricating viscosity; (b) an asphaltene dispersant comprising a cyclic headgroup that contains a nitrogen atom and at least one other heteroatom; and (c) a detergent derived from an alkyl phenol. The invention further provides methods of using such compositions in the operation of engine, particularly marine diesel engines.
Abstract:
The present invention relates to a method of lubricating an internal combustion engine with a power output of at least 1600 kilowatts by supplying to the internal combustion engine a lubricating composition containing an oil of lubricating viscosity and at least 0.5 wt % of a hydrocarbyl-substituted carboxylic acid or anhydride thereof. The invention further provides a lubricating composition suitable for the method.
Abstract:
An apparatus for mounting an object precisely in a specific plane. An object is mounted on small support points rather than flat pads or other flat surfaces. The support points are stiff but not completely rigid. Exactly four support points are used. Mechanical forces are sufficient to slightly compress the two higher support points on a diagonal and to slightly compress the object so that the object presses against all the support points, with a higher amount of compression for one pair of diagonal points relative to the other two points. In an example embodiment, the support points are formed at the intersection of curved surfaces or at the intersection of multiple planar surfaces. In a specific example embodiment, the points are formed at the intersection of cylindrical surfaces. The points are fabricated by a cylindrical cutting bit that has partial-cylinder grooves formed circumferentially in the bit. The outer surface of the bit is used to mill two intersecting planes, and the grooves result in cylindrical surfaces intersecting at the same angle as the intersecting planes. The resulting support points are true singular points, but with limited compressibility because of the shallow angle of the material just below the points.
Abstract:
An additive concentrate having a TBN greater than 300 suitable for incorporation into a finished lubricating oil composition comprising:(I) a lubricating oil soluble sulphurised or non-sulphurised alkaline earth metal hydrocarbyl phenate derived either from a hydrocarbyl phenate or its precursors and modified by reaction to incorporate:(i) an aldehyde, and(ii) from greater than 2 to less than 40% by weight based on the weight of the concentrate of either (a) at least one carboxylic acid having the formula: ##STR1## wherein R is a C.sub.10 to C.sub.24 alkyl or alkenyl group and R.sup.1 is either hydrogen, a C.sub.1 to C.sub.4 alkyl group or a --CH.sub.2 --COOH group, or an anhydride or ester thereof, or (b) a di- or polycarboxylic acid containing from 36 to 100 carbon atoms or an anhydride or ester thereof, and (II) a lubricating oil,wherein the amount of lubricating oil (II) in the additive concentrate is such that the ratio of the weight of the additive concentrate to the weight of the hydrocarbyl phenate or its precursors from which the modified sulphurised or non-sulphurised phenate is derived is at least 3.0.
Abstract:
A lubricating oil composition suitable for use in low- or medium-speed diesel engines comprising a fuel oil with a residual oil content characterised in that the lubricating oil composition further comprises a "black paint" reducing amount of the product obtained by the reaction at elevated temperature of a hydrocarbyl-substituted succinic anhydride with either serine or an aminosalicylic acid.
Abstract:
An additive concentrate having a TBN greater than 300 suitable for incorporation into a finished lubricating oil comprises: (I) a lubricating oil soluble overbased alkaline earth metal hydrocarbyl salicylate modified by reaction to incorporate (a) an aldehyde, and (b) from 2 to 40% by weight, based on the weight of the concentrate, of either (i) at least one carboxylic acid having the formula: ##STR1## wherein R.sup.3 is a C.sub.10 to C.sub.24 alkyl or alkenyl group and R.sup.4 is either hydrogen, a C.sub.1 to C.sub.4 alkyl group or a CH.sub.2 COOH group, or an anhydride or ester thereof, or (ii) a di- or poly-carboxylic acid containing from 36 to 100 carbon atoms or an acid anhydride, acid chloride or ester thereof, and (II) a lubricating oil.
Abstract:
Grounding technology is provided for a short-wire, circuit board test fixture. As a result of the grounding technology, the ground between a circuit board test system and a circuit board under test can be reliably controlled. The grounding technology provides testing at extremely higher speeds by minimizing ground bounce. An internal ground plane is situated in the test fixture. Pursuant to one embodiment of the invention, a coax assembly at ground potential surrounds critical signal paths between the internal ground plane and an alignment plate situated at the bottom of the test fixture. Either a conductive alignment plate or a conductive ground comb affixed to a non-conductive alignment plate is implemented to permit conduction of the ground signal between the board test system and the coax assembly. In another embodiment, an array of ground personality pins provides conduction of the ground signal between the internal ground plane and the board test system. The ground personality pins are clustered around critical signal paths to control impedance.