A copolymer with high chemical homogeneity, consisting of (A) 50 to 30% by weight of ethylene, (B) 50 to 70% by weight of C.sub.4- to C.sub.24-hydrocarbyl ester of (meth)acrylic acid, (C) 0 to 5% by weight of (meth)acrylic acid and (D) 0 to 10% by weight of copolymerizable monomers, obtainable by polymerizing a mixture of 80 to 60% by weight of ethylene, 20 to 40% by weight of (meth)acrylic acid and 0 to 10% by weight of copolymerizable monomers in a backmixing, continuous polymerization apparatus, and subsequently polymer-analogously esterifying the resulting copolymer with C.sub.4- to C.sub.24-hydrocarbinols. The inventive copolymer is suitable for improving the cold flow properties of fuel oils, for lowering the lower mixing temperature of cold flow improver additives into fuel oils, and for improving the filterability of fuel oils comprising cold flow improver additives.

The present invention discloses a homo-polymeric and co-polymeric wax inhibitor (WI) useful for the flow of waxy crude oil and their synthesis thereof. The WI(s) comprises of any one of C14 to C24 fatty alcohol or mixture thereof in 2 mol % to 50 mol %, and an unsaturated organic acid i.e. acrylic acid, and poly alpha olefins i.e. poly alpha hexene, poly alpha octene, poly alpha decene, poly alpha dodecene of composition ranging from about 0.01 wt % to 20 wt % wherein the average molecular weight of poly alpha olefins used ranged from 1000 to 10000. A method of preparing a series of WI(s) with varying compositional ratios of the fatty alcohols, acrylic acid and polyalpha olefins targeting a wide range (C17 to C65 or beyond) of wax present in waxy crude oil is also disclosed.

Concentrates containing specific functionalised diblock copolymers serve as effective additives for improving the cold flow behaviour of fuels and oils, the copolymers being derived from a terminally-unsaturated intermediate polymer obtained via a metallocene process involving hydrogen.

The present invention relates to novel uses of corrosion inhibitors in fuels and lubricants.

The use is described of polymers which contain, in copolymerized form, an -olefin, a vinyl ester and an ester of an ,-unsaturated carboxylic acid as an additive for fuel oils and lubricants and in particular as a cold flow improver in fuel oils. In addition, the fuel oils and lubricants additized with these polymers; and also additive packages comprising such polymers are described.

The present invention provides a lubricating oil composition including a viscosity index improver (A) containing a comb-shaped polymer and having an SSI (shear stability index) of 30 or less together with a base oil, wherein an HTHS viscosity (high temperature high shear viscosity) at 150 C. (T.sub.150) is 1.6 to 2.9 mPa.Math.s, and a ratio of a kinematic viscosity at 40 C. (V.sub.40) [mm.sup.2/s] to the HTHS viscosity at 150 C. (T.sub.150) [mPa.Math.s] (V.sub.40/T.sub.150) is 12.4 or less. The lubricating oil composition of the present invention is excellent in fuel consumption reducing properties in a low-temperature region assuming the time of starting an engine while making various properties, such as a viscosity, etc., in a high-temperature region assuming the time of high-speed operation of an engine favorable.

The use is described of polymers which contain, in copolymerized form, an -olefin, a vinyl ester and an ester of an ,-unsaturated carboxylic acid as an additive for fuel oils and lubricants and in particular as a cold flow improver in fuel oils. In addition, the fuel oils and lubricants additized with these polymers; and also additive packages comprising such polymers are described.

The present invention is a polymer having structural units, units of formula I, units of formula II and units of either formula IIIa or formula IIIb:

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The polymer improves the low-temperature properties of fuel oils from petroleum sources and especially from vegetable or animal sources.

Sodium Polyacrylate mixture buffer tank solution for fuel quality and tank protection of fuel storage is disclosed. This invention uses a Sodium Polyacrylate mixture to remove water from fuel which is more efficient because it works without the use of filters, power, or fuel additives. This system also uses an off-line buffer tank that does not interfere with the on-site operations and allows the Sodium Polyacrylate mixture to extract water from fuel without power, agitation, filtration, or mixing.

Sodium Polyacrylate mixture buffer tank solution for fuel quality and tank protection of fuel storage is disclosed. This invention uses a Sodium Polyacrylate mixture to remove water from fuel which is more efficient because it works without the use of filters, power, or fuel additives. This system also uses an off-line buffer tank that does not interfere with the on-site operations and allows the Sodium Polyacrylate mixture to extract water from fuel without power, agitation, filtration, or mixing.