DE10109260A1 - Fuel additive for spark-ignition engines, useful for increasing motor octane number, comprises high molecular weight polyalkene and detergent additive - Google Patents

Abstract

Fuel additive for spark-ignition engines comprises a high molecular weight polyalkene, a detergent additive and optionally other additives in a solvent. An Independent claim is also included for a fuel composition for spark-ignition engines, comprising a major amount of a hydrocarbon fuel and a motor octane number (MON)-increasing amount of a high molecular weight polyalkene.

Description

The invention relates to novel fuel additive compositions gen with an effect increasing the engine octane number (MOZ); Ver drive to manufacture such improved compositions; thus additive fuels for gasoline engines; as well as procedures to improve the running properties of a gasoline engine.

Petrol is usually added to the inlet valves and the entire intake system of gasoline engines hold. The additive packages used consist of complex Ge mix several components that have different functions in within the overall effect of the additive package. As examples of important components of such additive packages can detergent additives, carrier oils, lubricity improvers and the like.

The octane number is a measure of the knock resistance of an engine fuel. Knock is caused by irregular and / or premature induced combustion processes. These lead to one considerable thermal and mechanical additional stress on the Mo tors. In practice there are different methods of determination for the Octane number common, which for one and the same fuel under different octane values result. The most used The octane number is the engine octane number (MOZ) and the Research octane number (RON). While the measurement conditions for the RON rather the operating conditions of the engine at low speed speed and changing speed (city traffic), the measurement conditions of the MOZ rather reflect the behavior at con constant speed and high load. The RON value is there always above the MOZ value. The minimum requirements are according to EN 228 for regular gasoline at 91.0 RON and 82.5 MOZ and for Eurosu per at 95.0 RON and 85.0 MOZ. The difference between RON and MOZ is referred to as so-called "fuel sensitivity". ever the lower this value, the cheaper the property profile of the fuel.

The knock resistance of petrol used to be particularly which is improved by adding lead tetraetyl as an anti-knock agent sert. The required octane number is there in newer fuels set by that during the petrochemical workup the crude oil with the help of special processes the share of knock resistance  improving branched hydrocarbons increased becomes.

WO 97/12014 suggests the use of high molecular weight poly mer to improve the mechanical efficiency of combustion motors. In particular, an improvement of the Fuel consumption can be observed. An investigation of the The octane number was only influenced by very small ones Additive amounts an increase in RON. In the entire tested menu In contrast, no change in the MOZ was observed.

So far, no additive systems are known that exclusively based on purely organic-chemical components and minimal Most concentrations in petrol increase the moto effect number of MOZ. In particular, no such ad ditive has been described, which in combination with the above ge called detergent additive packages can be used.

The object of the present invention was therefore to provide it of additives, which he the engine octane number of petrol heights and / or improve fuel sensitivity and can also be used in detergent additive packages.

Surprisingly, it was found to be high when used molecular polyalkenes in petrol have significant MOZ is increased, and thus the fuel properties significantly ver be improved. In contrast, the RON remains essentially unchanged changed. In addition, it was surprisingly found that such high molecular weight compounds in an advantageous manner Detergent additive packages can be incorporated without the we other parts of the package, especially the detectors gene additives and the carrier oils negatively affect.

A first subject of the invention therefore relates to a force substance additive composition for gasoline engines, characterized by it is that they, in solution, at least one highly mot molecular polyalkene in combination with at least one detergent additive and, if appropriate, further customary fuel additive includes components.

Preferred fuel additive compositions are those which, as high molecular weight polyalkene, comprise a polyalkene with a viscosimetrically determined average molecular weight Mv (determined via the Staudinger index in isooctane as solvent, at a temperature of about 20 to 35 ° C., in particular about 20 ° C.; see Ullmann Encyclopedia of Industrial Chemistry, 5th ed., 1992 A20, pp. 509 ff.) from about 20,000 to 9,000,000, such as e.g. B. about 300,000 to 9,000,000. The M _w value of suitable polyalkenes is approximately in the same range of values.

Preferably the polyalkene used is a polyisobutene such as z. B. ultra-high molecular weight polyisobutene, which is among the Han Oppanol ® B 246 or B50 from BASF AG ver is driven.

Particularly preferred fuel additive compositions according to the invention further comprise at least one detergent additive which has at least one hydrocarbon radical with a number average molecular weight M _N of about 85 to 20,000 and which carries at least one polar group as the end group.

Another object of the invention relates to fuel together Settings for gasoline engines, which are in a main quantity of a Common hydrocarbon fuel an engine octane number (MOZ) increasing amount of at least one high molecular weight polyalkene as defined above, possibly in combination with a effective amount of at least one detergent additive.

Fuel compositions containing additives according to the invention the high molecular weight polyalkene in a proportion of about 1 to 30 mg / kg fuel, such as B. about 2 to 25 mg / kg.

In addition, the high molecular weight polyalkene and the detergent addi tiv preferably in a weight ratio in the range of about 1: 5000 to 3: 1, preferably about 1: 1000 to 2: 1 are included.

Another object of the invention relates to the use of at least one high molecular weight polyalkene according to the above definition tion, preferably in combination with at least one detergent additive and optionally at least one carrier oil, as Fuel additive for gasoline engines to increase engine octane number.

Another object of the invention relates to a method for Production of a fuel additive composition according to the invention tongue, where one can use high molecular weight polyalkene mecha nisch crushed, e.g. B. in an organic, fuel-compatible union solvent, with stirring, if necessary with a light Heating, e.g. B. up to about 50 ° C, in solution and with we at least one detergent additive and optionally with others usual additive components at room temperature or under light heating, such as B. up to about 50 ° C, mixes.  

Finally, the invention relates to a method for improvement the running characteristics of a gasoline engine, which is characterized by it The net thing is that you run the engine on petrol, comprising an MOZ-increasing amount of an additive a polyalkene as defined above is additive.

There now follows a more detailed description of the invention a) Polyalkenes

The high molecular weight polyalkenes used according to the invention are known compounds. They can either be manufactured in a manner known per se or are commercially available as such. The polyalkenes are composed in particular of C ₂ -C ₆ , in particular C ₂ -C ₄ alkene monomers, such as, in particular, ethylene, propylene, 1-butene, 2-butene or isobutene, or mixtures of these monomers.

The preparation of suitable polyalkenes is familiar to the person skilled in the art and described, for example, in Ullmann's encyclopedia of Technical Chemistry, 4th ed., 1980, volume 19.

Useful commercial products include the polyisobutenes marketed under the name Op panol® B246 with an M _v of approximately 8,000,000, or Oppanol® B50 with an Mv of approximately 400,000, Oppa nol® B80 with an M _v of approximately 800,000, Oppanol® 8100 with an M _v of approximately 1,100,000, Oppanol® B150 with an M _v of approximately 2,600,000 and Oppanol® B200 with an M _v of approximately 4,000,000.

b) solvents

The high molecular weight polyalkenes are pre-used preferably in suitable, fuel-compatible organic solvents solvents solved. Examples include: liquid alkanes, such as in particular isooctane; Aromatics such as toluene or xylene; aromatics-containing refinery products such as solvent naph tha heavy; Kerosene fractions; Base oils, such as solvent neutral Viscosity classes SN 100 to SN 500; as well as mixtures thereof.

c) detergent additives

The polyalkenes according to the invention are preferably combined with at least one gasoline additive with detergent action or with valve seat wear-inhibiting action (hereinafter referred to as detergent additive). This detergent additive has at least one hydrophobic hydrocarbon residue with a number average molecular weight (M _N ) of 85 to 20,000 and at least one polar group selected from:

• a) Mono- or polyamino groups with up to 6 nitrogen atoms men, where at least one nitrogen atom is basic has;
• b) nitro groups, optionally in combination with hydroxyl groups;
• c) hydroxyl groups in combination with mono- or polyamino groups, with at least one nitrogen atom basic egg has properties;
• d) carboxyl groups or their alkali metal or alkaline earth metal metal salts;
• e) sulfonic acid groups or their alkali metal or alkaline earth limetallsalzen;
• f) polyoxy-C ₂ - to C ₄ -alkylene groupings which are terminated by hydroxyl groups, mono- or polyamino groups, at least one nitrogen atom having basic properties, or by carbamate groups;
• g) Carbonsäureestergruppen;
• h) groups derived from succinic anhydride Hydroxy and / or amino and / or amido and / or imido groups; and
• i) by Mannich reaction with substituted phenols Aldehydes and mono- or polyamines generated groupings gene;

The hydrophobic hydrocarbon residue in the above detergent additives, which ensures sufficient solubility in the fuel, has a number average molecular weight (M _N ) from 85 to 20,000, in particular from 113 to 10,000, especially from 300 to 5000. As a typical hydrophobic hydrocarbon residue, in particular those in conjunction with the polar groups (a), (c), (h) and (i), the polypropenyl, polybutenyl and polyisobutyl nyl radical each having M _N = 300 to 5000, in particular 500 to 2500, especially 700 until 2300.

The following are examples of the above groups of detergent additives:
Additives containing mono- or polyamino groups (a) are preferably polyalkene mono- or polyalkene-polyamines based on polypropene or highly reactive (ie with predominantly terminal double bonds - mostly in the alpha and beta positions) or conventional (ie with predominantly central double bonds) ) Polybutene or polyisobutene with M _N = 300 to 5000. Such additives based on highly reactive polyisobutene, which units from the polyisobutene, which can contain up to 20% by weight of n-butene units, by hydroformylation and reductive amination Ammonia, monoamines or polyamines such as dimethylamino propylamine, ethylenediamine, diethylenetriamine, triethylenetetramine or tetraethylenepentamine can be produced in particular are known from EP-A-244 616. If one starts with the manufacture of the additives of polybutene or polyisobutene with predominantly central double bonds (mostly in the beta and gamma position), the production route by chlorination and subsequent amination or by oxidation of the double bond with air or ozone to form carbonyl or carboxyl compound and subsequent amination under reductive (hydrogenating) conditions. The same amines as above for the reductive amination of the hydroformylated, highly reactive polyisobutene can be used here for the amination. Corresponding additives based on polypropene are described in particular in WO-A-94/24231.

Other preferred additives containing monoamino groups (a) are the hydrogenation products of the reaction products from polyisobutenes with an average degree of polymerization P = 5 to 100 with Sticko xides or mixtures of nitrogen oxides and oxygen, as they ins are particularly described in WO-A-97/03946.

Other preferred additives containing monoamino groups (a) are the polyisobutene epoxides by reaction with amines and after following dehydration and reduction of the amino alcohols union compounds, as be particularly in DE-A-196 20 262 are written.

Nitro groups, optionally in combination with hydroxyl groups, (b) ent holding additives are preferably reaction products made of poly isobutenes of average degree of polymerization P = 5 to 100 or 10 to 100 with nitrogen oxides or mixtures of nitrogen oxides and Oxygen, as described in particular in WO-A-96/03367 and WO-A-96/03479 are described. These implementation products provide usually mixtures of pure nitropolyisobutanes (e.g. ", $ - dinitropolyisobutane) and mixed hydroxynitropolyisobutanes (e.g. "-Nitro - $ - hydroxypolyisobutane).  

Additives containing hydroxyl groups in combination with mono- or polyamino groups (c) are, in particular, reaction products of polyisobutene epoxides, obtainable from polyisobutene preferably having predominantly double bonds with M _N = 300 to 5000, with ammonia, mono- or polyamines, as described in particular in EP A -476,485.

Additives containing carboxyl groups or their alkali metal or alkaline earth metal salts (d) are preferably copolymers of C ₂ -C ₄₀ olefins with maleic anhydride with a total molecular weight of 500 to 20,000, the carboxyl groups of which are wholly or partly to the alkali metal or alkaline earth metal salts and a remain the rest of the carboxyl groups are reacted with alcohols or amines. Such additives are known in particular from EP-A-307 815. Such additives are mainly used to prevent valve seat wear and, as described in WO-A-87/01126, can advantageously be used in combination with conventional fuel detergents such as poly (iso) butenamines or polyetheramines.

Sulphonic acid groups or their alkali metal or alkaline earth metal additives containing salts (s) are preferably alkali metal or alkaline earth metal salts of an alkyl sulfosuccinic acid ester, as described in particular in EP-A-639 632. Derar additives are mainly used to prevent valves seat wear and can be used in combination with usual Fuel detergents such as poly (iso) butenamines or polyethera mines are used.

Additives containing polyoxy-C ₂ -C ₄ -alkylene groups (f) are preferably polyethers or polyetheramines which are obtained by reacting C ₂ -C ₆₀ -alkanols, C ₆ -C ₃₀ -alkanediols, mono- or di-C ₂ -C ₃₀ alkylamines, C ₁ -C ₃₀ alkylcyclohexanols or C ₁ -C ₃₀ alkyl phenols with 1 to 30 mol ethylene oxide and / or propylene oxide and / or butylene oxide per hydroxyl group or amino group and, in the case of the polyetheramines, by subsequent reductive amination Ammonia, monoamines or polyamines are available. Such products are described in particular in EP-A-310 875, EP-A-356 725, EP A-700 985 and US-A-4 877 416. In the case of polyethers, such products also meet carrier oil properties. Typical examples are tridecanol or isotridecenol butoxylates, isononylphenol butoxylates and polyisobutenol butoxylates and propoxylates, and the corresponding reaction products with ammonia.

Additives containing carboxylic acid ester groups (g) are preferably esters of mono-, di- or tricarboxylic acids with long-chain alkanols or polyols, in particular those with a minimum viscosity of 2 mm ² / s at 100 ° C., as described in particular in DE-A-38 38 918 are described. Aliphatic or aromatic acids can be used as mono-, di- or tricarboxylic acids, and long-chain representatives with, for example, 6 to 24 carbon atoms are particularly suitable as ester alcohols or polyols. Typical representatives of the esters are adipates, phthalates, isophthalates, terephthalates and trimellitates of iso-octanol, iso-nonanols, iso-decanols and iso-tridecanol. Such products also have carrier oil properties.

Groups derived from succinic anhydride and containing hydroxyl and / or amino and / or amido and / or imido groups (h) are preferably corresponding derivatives of polyisobutenylsuccinic anhydride which can be obtained by reacting conventional or highly reactive polyisobutene with M _N = 300 to 5000 with maleic anhydride are available thermally or via the chlorinated polyisobutene. Of particular interest are derivatives with aliphatic polyamines such as ethylene diamine, diethylene triamine, triethylene tetramine or tetraethylene pentamine. Such gasoline fuel additives are described in particular in US-A-4,849,572.

Groups (i) containing additives produced by Mannich reaction of substituted phenols with aldehydes and mono- or polyamines are preferably reaction products of polyisobutene-substituted phenols with formaldehyde and mono- or polyamines such as ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylene pentamine or dimethylaminopropylamine. The polyisobutenyl-substituted phenols can originate from conventional or highly reactive polyisobutene with M _N = 300 to 5000. Such "poly isobutene Mannich bases" are described in particular in EP-A-831 141 be.

For a more precise definition of the individual listed Otto powers Toffadditive is based on the disclosures of the above Writings of the prior art expressly referenced.

d) carrier oils and other components

The fuel additive compositions according to the invention can in addition, other common components and additives ent hold. Here are primarily carrier oils without pronounced de to name effects.  

Suitable mineral carrier oils are used in petroleum processing resulting fractions, such as kerosene or naphtha, Brightstock or Base oils with viscosities such as those from the SN class 500-2000; but also aromatic hydrocarbons, paraffini hydrocarbons, and alkoxyalkanols. It is useful if one known as "hydrocrack oil" and in refining mineral oil fraction (vacuum distillate cut with egg nem boiling range of about 360 to 500 ° C, available from under High pressure catalytically hydrogenated and isomerized and entpa refined natural mineral oil). Wed are also suitable mineral carrier oils mentioned above.

Examples of synthetic carrier oils which can be used according to the invention are selected from: Polyolefins (Polyalphaolefine or Poly internal olefins), (poly) esters, (poly) alkoxylates, polyethers, aliphatic polyetheramines, alkylphenol-started polyethers, long alkylphenol-started polyetheramines and carboxylic acid esters chain alkanols.

Examples of suitable polyolefins are olefin polymers with M _N = 400 to 1800, especially based on polybutene or polyisobutene (hydrogenated or non-hydrogenated).

Examples of suitable polyethers or polyetheramines are compounds which preferably contain polyoxy-C ₂ -C ₄ -alkylene groups and which are obtained by reacting C ₂ -C ₆₀ -alkanols, C ₆ -C ₃₀ -alkanediols, mono- or di-C ₂ -C ₃₀ alkylamines, C ₁ -C ₃₀ alkylcyclohexano len or C ₁ -C ₃₀ alkylphenols with 1 to 30 mol ethylene oxide and / or propylene oxide and / or butylene oxide per hydroxyl group or amino group and, in the case of the polyetheramines, by subsequent reductive Amination with ammonia, monoamines or polyamines are available. Such products are described in particular in EPA-310 875, EP-A-356 725, EP-A-700 985 and US-A-4,877,416. For example, poly-C ₂ -C ₆ -alkylene oxide mines or functional derivatives thereof can be used as polyetheramines. Typical examples are tridecanol or isotridecanol butoxylates, isononylphenol butoxylates and polyisobutenol butoxylates and propoxylates as well as the corresponding reaction products with ammonia.

Examples of carboxylic acid esters of long-chain alkanols are in particular special esters of mono-, di- or tricarboxylic acids with langketti gene alkanols or polyols, as described in particular in DE-A-38 38 918 are described. As mono-, di- or tricarboxylic acids NEN aliphatic or aromatic acids are used as Ester alcohols or polyols are particularly suitable for long-chain ones Representatives with, for example, 6 to 24 carbon atoms. Typical representatives  the esters are adipates, phthalates, isophthalates, terephthalas latex and trimellitate of isooctanol, isononanol, isodecanol and the isotridecanol, such as. B. Di- (n- or isotridecyl) phtha lat.

Other suitable carrier oil systems are described, for example in, DE-A-38 26 608, DE-A-41 42 241, DE-A-43 09 074, EP-A-0 452 328 and EP-A-0 548 617, to which express reference is hereby made men will.

Examples of particularly suitable synthetic carrier oils are alcohol-initiated polyethers with about 5 to 35, such as. B. about 5 to 30, C ₃ -C ₆ alkylene oxide units, such as. B. selected from propyl oxide, n-butylene oxide and i-butylene oxide units, or mixtures thereof. Non-limiting examples of suitable starter alcohols are long-chain alkanols or phenols substituted with long-chain alkyl, the long-chain alkyl radical in particular representing a straight-chain or branched C ₆ -C ₁₈ - C ₈ -C ₁₅ alkyl radical. Preferred examples are tridecanol and nylphenol.

Other suitable synthetic carrier oils are alkoxylated alkyl phenols as described in DE-A-10 10 2913.6

Other common additives are corrosion inhibitors, for example wise based on ammonium salts or film ganic carboxylic acids or heterocyclic aromatics Nonferrous metal corrosion protection; Antioxidants or stabilizers, for example based on amines such as p-phenylenediamine, dicy clohexylamine or derivatives thereof or of phenols such as 2,4-di tert-butylphenol or 3,5-di-tert-butyl-4-hydroxyphenylpro propionic acid; demulsifiers; Antistatic agents; Metallocenes like Ferro opportunities; methylcyclopentadienyl; lubricity improvers (lubricity additives) such as certain fatty acids, alkene nylsuccinic acid ester, bis (hydroxyalkyl) fatty amines, hydroxyaceta mide or castor oil; and dyes (markers). Possibly are also amines to lower the pH of the fuel added.

The components or additives can be the petrol individually or together as a previously prepared concentrate (additive package) added with the high molecular weight polyalkene according to the invention become.

The detergent additives mentioned with the polar groupings (a) to (i) are usually used in an amount of petrol from 10 to 5000 ppm by weight, in particular 50 to 1000 ppm by weight, are added.  The other components and additives mentioned are if desired, added in the usual amounts for this.

d) petrol

The additive compositions according to the invention are in all conventional petrol, such as those found in Ullmann's Encyclopedia of Industrial Chemistry, 5th ed. 1990, volume A16, P. 719 ff. Can be used.

For example, use in a petrol with one Aromatic content of up to 42 vol.% And a sulfur content of maximum 150 ppm by weight possible.

The aromatic content of the petrol is, for example, 30 up to 42% by volume, in particular 32 to 40% by volume.

The sulfur content of petrol is 5, for example up to 150 ppm by weight, in particular at 10 to 100 ppm by weight.

For example, petrol has an olefin content of 6 up to 21 vol .-%, in particular at 7 to 18 vol .-%.

The petrol can have a benzene content of 0.5, for example have up to 1.0 vol .-%, in particular at 0.6 to 0.9 vol .-%.

The petrol has an oxygen content, for example from 1.0 to 2.7% by weight, in particular from 1.2 to 2.0% by weight.

In particular, such gasoline fuels can be mentioned as examples which also have an aromatic content of maximum 38 Vol.%, An olefin content of at most 21 vol.%, A sulfur content of a maximum of 50 ppm by weight, a benzene content of a maximum of 1.0% by volume and an oxygen content of 1.0 to 2.7% by weight sen.

The alcohol and ether content in petrol is normal relatively low. Typical maximum levels are for Me ethanol 3 vol.%, for ethanol 5 vol.%, for isopropanol 10 vol.%, for tert-butanol 7 vol.%, for isobutanol 10 vol.% and for Ether with 5 or more carbon atoms in the molecule 15 vol .-%.

The summer vapor pressure of petrol is usually maximum 70 kPa, especially 60 kPa (each at 37 ° C).  

The RON of petrol is usually 90 to 100. On The usual range for the corresponding MOZ is 80 to 90.

The specifications are based on customary methods true (DIN EN 228).

e) production of the fuel additive according to the invention together subsidence

First, the high molecular weight polyalkene in Lö is required bring solution. For this purpose, the mostly solid polyalkene is added otherwise crushed (particle size e.g. about 1 to 2 mm). The shredded material is then in a suitable organi added solvent and optionally with heating until completely dissolved (1 h to 48 h). To this In this way, stock solutions with a polymer content of approximately 0.5 up to 5 wt .-% can be obtained. This stock solution is then given if necessary with other additive components, such as detergents or Mixed carrier oils, e.g. B. by further stirring at room temperature structure or with gentle heating, and as such a mixture the Ot Fuel added.

The invention will now be described on the basis of the following exemplary embodiments explained in more detail.

Production Example 1

• a) 20 g of crushed (granules with an edge length of about 1-2 mm) commercially available high molecular weight polyisobutene (PIB) with an average molecular weight M _v of about 8,000,000 are added to 980 g of isook tan and stirred at room temperature for several hours.
• b) 20 g of high molecular weight polyisobutene (PIB) according to a) become 980 g Given xylene and stirred at room temperature for several hours.
• c) 20 g of high molecular weight polyisobutene (PIB) according to a) become 980 g Solvent naphtha given heavily and several at room temperature Hours stirred.
• d) 20 g of high molecular weight polyisobutene (PIB) according to a) become 980 g Given kerosene and stirred at room temperature for several hours.

Production Examples 2a) to d)

Carried out as in production examples 1a) to d) using commercially available high molecular weight PIB with an M _v of approximately 400,000.

Production Example 3

• a) 1000 g of the products from preparation example 1a) at Room temperature with 1000 g of the base oil Solvent Neutral SN 100 mixed and stirred for several hours.
• b) 1000 g of the products from preparation example 1b) are added Room temperature with 1000 g of the base oil Solvent Neutral SN 100 mixed and stirred for several hours.
• c) 1000 g of the products from preparation example 1c) are Room temperature with 1000 g of the base oil Solvent Neutral SN 1600 mixed and stirred for several hours.
• d) 1000 g of the products from preparation example 1d) are Room temperature with 1000 g of the base oil Solvent Neutral SN 1600 mixed and stirred for several hours.

Production Example 4

• a) 870 g of the additive from preparation example 3a) are added Room temperature with 130 g of a fully synthetic detergent addi tivpakets (PURADD® AP 97-10 from BASF), consisting predominantly from the detergent polyisobutene monoamine (Kerocom® PIBA from BASF) and a propylene oxide-containing carrier oil.
• b) 670 g of the additive from preparation example 1a) are added Room temperature with 330 g of a fully synthetic detergent addi tivpakets (Keropur® 3458 from BASF), consisting mainly of the detergent polyisobutene monoamine (Kerocom® PIBA from BASF) and a propylene oxide-containing carrier oil.

Application example 1 Determination of the influence on the octane number len

The determination of the octane numbers RON (Research octane number) and MOZ (Engine octane number) was carried out in a knock engine provided for this purpose according to the methods EN 25164 (RON) or EN 25163 (MOZ). The Messun were carried out with Eurosuper fuels according to EN228. The results for various additive formulations according to the invention stanchions are summarized in Table 1.  

Table 1

The experimental data in Table 1 clearly show that the Mo Toroct number (MOZ) when using the additives according to the invention si can be significantly increased without the research octane number (RON) is influenced

Example of use 2 Behavior with intake valve cleanliness in Combination with detergent additive packages

The check of intake valve cleanliness in gasoline engines was carried out with the Mercedes Benz M102E test engine according to CEC F-05-A-93 guided. The base fuel was OK 1, a Eurosuper power material according to EN 228. The deposits are measured on the input let valves, from which the mean is formed. The results are summarized in Table 2 below.

Table 2

The results in Table 2 clearly show that at Use of combinations of octane number improvers according to the invention plus detergent additive the formation of deposits on the one valve of gasoline engines is effectively reduced.

Claims (13)

1. Fuel additive composition for gasoline engines, characterized in that it comprises, in dissolved form, at least one high molecular weight polyalkene in combination with at least one detergent additive and optionally other conventional fuel additive components. 2. Fuel additive composition according to claim 1, characterized in that the high molecular weight polyalkene is a polyalkene with a viscosimetrically determined average molecular weight M _v of about 20,000 to 9,000,000. 3. Fuel additive composition according to one of the preceding the claims, characterized in that the polyalkene Is polyisobutene. 4. Fuel additive composition according to claim 3, characterized ge indicates that the polyisobutene is a high molecular weight poly isobutene. 5. Fuel additive composition according to one of the preceding claims, characterized in that the detergent additive has at least one hydrocarbon residue with a number average molecular weight M _N of about 85 to 20,000, which carries at least one polar grouping. 6. Fuel composition for gasoline engines, characterized records that they are in a bulk of a hydro fuel increases the engine octane number (MOZ) Amount of at least one high molecular weight polyalkene according to the Definition defined in one of the preceding claims. 7. Fuel composition according to claim 6, characterized records that they are the high molecular weight polyalkene in Kombina tion with an effective amount of at least one detergent add ditivs includes. 8. Fuel composition according to claim 6 or 7, characterized ge indicates that it is the high molecular weight polyalkene in one Contains about 1 to 30 mg / kg of fuel.   9. Fuel composition according to one of claims 6 to 8, characterized in that high molecular weight polyalkene and Detergent additive in a weight ratio in the range of about 1: 5000 to 3: 1 are included. 10. Use of at least one high molecular weight polyalkene as defined in one of claims 1 to 4 as a force Additive for gasoline engines to increase the number of engine octets. 11. Use according to claim 10 in combination with at least egg nem detergent additive and optionally at least one carrier transfer oil. 12. A method of making a fuel additive composition tongue according to one of claims 1 to 5, characterized in net that you can mecha high molecular weight polyalkene nisch crushed, in an organic, fuel-compatible Chen solvent in solution and with at least one Detergent additive and optionally with other customary ad ditive components mixes. 13. Process for improving the running properties of an Otto motors, characterized in that the engine with a Petrol operates with one that increases the MOZ Amount of an additive comprising a polyalkene as defined nition in one of claims 1 to 4, is additive.