Shell Oil Comapny

Henricus P Tomassen

Marinus Johannes Reynhout

Eit Drent

Janet A Day

Jian Lin

Keith Reading

Madelinde G Van Grieken

Christinus Cornelis Van De Kamp

The present invention provides a copolymer of at least one n-(C.sub.8 -C.sub.30 -alkyl) (meth)acrylate with maleic anhydride, which contains alternating (meth)acrylate and maleic anhydride monomeric units, characterized in that the copolymer has a degree of alternation of at least 85%, a process for preparing the copolymer, a hydrocarbon oil composition containing the copolymer and the use of the copolymer as a flow improver additive.

Polymeric flow improver additives

This invention provides hydrocarbon oil compositions comprising a major amount of a hydrocarbon oil and, as active ingredients, minor amounts of a copolymer of at least one n-(C.sub.8 -C.sub.40 -alkyl) (meth)acrylate with maleic anhydride, and at least one additive selected from the group consisting of a homopolymer or copolymer derived from an unsaturated hydrocarbon monomer, an ester and a wax anti-settling additive; additive concentrates containing the active ingredients and use of the latter in improving the cold flow properties of hydrocarbon oils.

Hydrocarbon oil compositions having improved cold flow properties

A hydrocarbon oil composition comprising a paraffinic hydrocarbon oil and as an additive, at least one linear polymer of carbon monoxide with one or more .alpha.-olefins having at least 10 carbon atoms per molecule said polymer comprising of substantially alternating monomer units of carbon monoxide and olefins is disclosed. Optionally, the composition may also contain one or more C.sub.9+ or less olefin polymer comprising of substantially alternating monomer units of carbon monoxide and olefins. This composition has and exhibits improved pour point, cloud point, and cold filter plugging point properties. These polymer additives are novel compounds, and a process for their synthesis is also disclosed.

Hydrocarbon oil compositions

Hydrocarbon oil compositions of improved low temperature properties comprise intimate mixtures of hydrocarbon oil and a linear alternating polymer of carbon monoxide and at least one straight-chain .alpha.-olefin of relatively high carbon number.

Oil compositions

The invention provides a diesel fuel additive for reducing fouling of injectors in diesel engines consisting of at least an effective concentration of a nitrogen-containing compound of general formula

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Amsterdam, Netherlands

Henricus P Tomassen