JPH04296393A - Gasoline composition - Google Patents

Abstract

PURPOSE: To provide a gasoline composition having relatively low viscosity and reduced tendency to adhere to a valve by incorporating a minor amount of an alkali metal salt of a partial ester of an alkylpolyether with a succinic acid derivative.

CONSTITUTION: There is provided the objective composition prepared by incorporating 1-1,000 ppmw (desirably 100-400 ppmw) of an alkali metal salt (desirably, a potassium salt) of a partial ester of an alkyl polyether alcohol represented by the formula (n is an integer of 4-25; R is a 6-20C alkyl; and R¹ is H or a 1-10C alkyl) with a succinic acid derivative [having a 15-200C (substituted) aliphatic hydrocarbon as the substituent at the α carbon atom, and this sometimes bonds to another α-carbo atoms through a 1-6C hydrocarbon moiety to show a ring structure] in a gasoline suitable for use in spark-ignition engines.

COPYRIGHT: (C)1992,JPO

Description

[Detailed description of the invention]

0001

FIELD OF THE INVENTION The present invention relates to gasoline suitable for use in spark ignition engines as a major component and at least one additive as a minor component.

0002

[Prior Art] U.S. Patent No. 3,632,510
Lubricating and fuel oil compositions are disclosed comprising a lubricating oil as a major component and ester derivatives of hydrocarbon-substituted succinic acids (including mixed ester metal salts) as a minor component. The hydrocarbon substituent has at least about 50% aliphatic hydrocarbons and no more than about 5% olefinic bonds based on the total number of carbon-carbon covalent bonds in the substituent. Sources of hydrocarbon substituents include substantially saturated olefin polymers, especially those from monoolefins of 2 to 30 carbon atoms. Polyisobutylene is said to be the most preferred source of hydrocarbon substituents. Alcohols suitable for obtaining ester derivatives include those of the general formula: HO-(-R1-O-)n-R2-OR3, where R3 is hydrogen; aryl; lower alcohols such as ethyl, propyl, t-butyl, pentyl, etc. alkyl; or aralkyl; n is from 0 to about 150; and R1 and R2
is a lower alkylene of up to 8 carbon atoms]. Addition of this ester derivative to fuel increases the cleanliness of the fuel delivery system by preventing deposits in fuel tanks, oil lines, carburetors, and fuel injectors; in addition, in many cases, combustion chamber deposits, It is also said to reduce spark plug fouling and exhaust valve deposits. It also functions effectively as a screen clogging prevention agent.

US Pat. No. 4,846,848 discloses that a minor component having a viscosity of 2 to 20 cSt (
2 x 10-6 to 2 x 10-5 m2/s) of a poly-α-olefin, optionally further containing an aliphatic polyamine, an alkali metal or alkaline earth metal salt of a succinic acid derivative as a combustion rate improver, and/or a polyolefin. A composition comprising: The succinic acid derivative has at least one α
A carbon atom has as a substituent an unsubstituted or substituted aliphatic hydrocarbon having 20 to 200 carbon atoms, or one of the alpha carbon atoms is substituted with an unsubstituted or substituted aliphatic hydrocarbon having 20 to 200 carbon atoms. have as a group, which is 1 to 6
It is said that it is bonded to another α carbon atom via a hydrocarbon moiety having a carbon atom to form a ring structure. The salt of this succinic acid derivative is a monobasic salt, and the remaining carboxyl group may be aminated or esterified. However, it is not stated which amines or alcohols are suitable for this amination or esterification, respectively. Preferred salts are stated to be dibasic salts.

British Patent Publication No. 2,177,418 (
Applicant's internal designation K6240 GBR) is a gasoline composition consisting of a gasoline suitable for use in spark ignition engines as a major component and an alkali metal or alkaline earth metal salt burn rate improver of a succinic acid derivative as a minor component. is disclosed. This succinic acid derivative has as a substituent an unsubstituted or substituted aliphatic hydrocarbon having 20 to 200 carbon atoms on at least one alpha carbon atom, or has 20 to 200 carbon atoms on one of the alpha carbon atoms. It has an unsubstituted or substituted aliphatic hydrocarbon as a substituent, which is bonded to another α carbon atom via a hydrocarbon moiety having 1 to 6 carbon atoms to form a ring structure. The salt of this succinic acid derivative is a monobasic salt, and the remaining carboxyl group may be aminated or esterified. However, it is not stated which amines or alcohols are suitable for this amination or esterification, respectively. Preferred salts are stated to be dibasic salts.

British Patent No. 1,306,233 discloses a composition suitable for use in fuels consisting of an oil-soluble carboxyl dispersion and a thermally stable, relatively low volatility petroleum fraction. There is. Carboxyl dispersions are carboxylic acids, or their anhydrides, esters, metal salts or acylated nitrogen derivatives. Succinic acids and anhydrides substituted with substantially saturated aliphatic hydrocarbons are said to be particularly preferred dispersions.

[0006]

[Problems to be Solved by the Invention] It is an object of the present invention that certain alkali metal salts of succinic acid derivatives are useful as ignition aids (burning speed improvers), and that they have lower ignition aids than conventionally known ignition aids. It has now been found that the viscosity has a low tendency to agglomerate. The latter is particularly problematic because it can lead to valve sticking.

[0007]

[Means for Solving the Problems] Therefore, according to the present invention,
Gasoline suitable for use in spark ignition engines as the main component and the general formula as a minor component:

[0008]

[C4]

[0009] An alkyl of the formula, where n is an integer from 4 to 25, R is a C6-C20 alkyl group, and each R1 independently represents a hydrogen atom or a C1-C10 alkyl group. Succinic acid derivatives of polyether alcohols [15 to at least one alpha carbon atom]
having as a substituent an unsubstituted or substituted aliphatic hydrocarbon having 200 carbon atoms, which is optionally bonded to another alpha carbon atom via a hydrocarbon moiety having 1 to 6 carbon atoms to form a ring structure and an alkali metal salt of a partial ester.

The present invention further provides a method of operating a spark ignition internal combustion engine in which the gasoline composition described above is introduced into the engine.

The alkali metal salt of the partial ester is preferably a sodium salt, particularly preferably a potassium salt.

The alkyl or aliphatic hydrocarbon substituent may be either linear or branched.

Preferably, n is an integer of 4 to 20, more preferably 4 to 15, and specifically 5 or 6.

R preferably contains at least 6 carbon atoms, more preferably at least 7 carbon atoms. Desirable R is a C9 to C15 alkyl group, and more preferably a C12 to C15 alkyl group.

Each R1 is independently a hydrogen atom or C
It is preferable to use a 1-C5 alkyl group, preferably a methyl group or an ethyl group.

The compound of general formula (I) is a known compound or can be synthesized by operations analogous to known reactions.

The nature of the substituent on at least one α carbon atom of the succinic acid derivative is important because it has a decisive effect on the solubility of the alkali metal salt of the partial ester in gasoline.

The aliphatic hydrocarbons are conveniently obtained from monomeric polyolefins having 2 to 6 carbon atoms, such as polyethylene, polypropylene, polybutylene, polypentene, polyhexene or mixed polymers. Among them,
Preference is given to aliphatic hydrocarbon groups obtained from polyisobutylene.

[0019] The aliphatic hydrocarbon preferably has 15 to
It has 150 carbon atoms, more preferably 15 to 100 carbon atoms, even more preferably 15 to 45 carbon atoms. Aliphatic hydrocarbons having 20 to 30 carbon atoms have been found to be particularly effective.

The aliphatic hydrocarbon group may have a substituent, ie, one or more hydrogen atoms may be substituted by another element, such as halogen, or by a non-aliphatic organic group, ie, for example (
unsubstituted phenyl group, hydroxy, ether, ketone,
It may also be substituted with an aldehyde or ester group.

[0021] The succinic acid derivative has one or more C15-C
200 It may have an aliphatic hydrocarbon group on one or both α carbon atoms. The succinic acid preferably has one C15-C200 aliphatic hydrocarbon group on one of its alpha carbon atoms. The other α carbon atom is left unsubstituted or has a relatively short substituent, e.g.
A C6 group is attached. The latter group is the above-mentioned C15-C2
00 May be combined with an aliphatic hydrocarbon group to form a ring structure.

The above-mentioned substituted succinic acid derivatives can be synthesized by conventional methods. When a polyolefin is used as a substituent, a polyolefin such as polyisobutylene and maleic acid or maleic anhydride are mixed and chlorine is passed through the mixture. This conveniently yields hydrogen chloride and polyolefin-substituted succinic acid derivatives (UK Patent No. 949,981).
.

[0023] In British Patent No. 1,483,729,
By heating and reacting polyolefin and maleic anhydride,
It is known to obtain hydrocarbon-substituted succinic anhydrides.

This partial ester from the polyolefin-substituted succinic acid has the general formula (
It is obtained by reacting I) with the alkyl polyether alcohol in a conventional manner. alkyl polyether alcohol,
For example, when n is 5, R is a mixture of C12 to C15 alkyl, and R1 is a methyl group, "Oxilube-500" is available from a company belonging to the Royal Dutch Shell Group.
''. From this partial ester, the corresponding alkali metal salt can be prepared by reaction with an alkali metal hydroxide such as potassium hydroxide.

In the gasoline composition of the present invention, the alkali metal salt of the partial ester is contained in an amount of 1 to 1000 ppm.
w, preferably 100 to 400 ppmw. Particularly preferably, the concentration of alkali metal such as potassium is 4 to 16 ppmw.

Those skilled in the art will appreciate that the presence of alkali metals in the gasoline composition of the present invention can be expected to prevent valve seat deformation in engines.

Other additives may also be incorporated into the gasoline composition of the present invention. That is, lead compounds can be included as antiknock agents, and the gasoline compositions of the present invention include both leaded and unleaded gasoline. Gasoline compositions also include phenolics such as 2,6-di-t-butylphenol or N,N'-di-sec-butylphenol.
- phenylenediamine antioxidants, such as phenylenediamine, and other than lead compounds, i.e. U.S. Pat.
No. 77,261 and European Patent Publication No. 151,621
Anti-knocking agents such as the polyether amino additives described in No. 3 can be included.

Among the additives to be added in addition to the alkali metal salts of the partial esters in the gasoline compositions of the invention, particularly preferred are polyolefins of C2 to C6 monomers. Preferably the polyolefin is polyisobutylene having from 20 to 175 carbon atoms, preferably from 35 to 150 carbon atoms. The amount of this polyolefin in the gasoline composition of the invention is preferably from 100 to 1200 ppmw. Alternatively, some or all of the polyolefins from C2 to C6 monomers may have the general formula: R
2 O-[(EO)m (PO)t ]-H
(II) [wherein EO represents ethyleneoxy; PO represents propyleneoxy; R2
represents C1-C20 alkyl; m and t represent the average number of ethyleneoxy and propyleneoxy in each hemiether molecule; m/(m+t) ranges from 0 to 0.5; t/(m+t) ranges from 0.5 to 1; the number average molecular weight (Mn) of the hemiether is 500
to 3000] may be substituted by polyoxyalkylene glycol hemiether. Preferably in formula II, R2 is a mixture of C12-C15 alkyl groups and the hemiether has a kinematic viscosity at 20°C (according to ASTM D445) of about 80 mm2/
It is s. Such a hemiether is available from a company belonging to the Royal Dutch Shell Group as “Oxilube-9”.
49". The amount of this hemiether in the gasoline composition of the present invention is preferably 100".
~1200 ppmw. In the gasoline composition of the present invention, in addition to the alkali metal salt of the partial ester, particularly preferred additions include C20 to C15
0 There is an alkyl- or alkenyl-containing polyamine. The polyamine is preferably N-polyisobutylene-N′,
N'-dimethyl-1,3-diaminopropane. The amount of this polyamine in the gasoline composition of the invention is preferably between 5 and 200 ppmw.

Particularly suitable additions other than the alkali metal salts of the partial esters to the gasoline compositions of the present invention are described in US Pat. No. 4,357,148. The additive composition consists of an oil-soluble aliphatic polyamine and a hydrocarbon polymer. This additive composition suppresses octane rating increase (ORI). Reducing ORI is associated with the prevention or removal of deposits from the combustion chamber and adjacent exposed parts of the spark ignition engine. Although various polyamines and various polymers can be used, polyolefins from monomers of 2 to 6 carbon atoms are
Preferably, it is used with a 20-C150 alkyl- or alkenyl-containing polyamine, and such combinations are desirable in the gasoline compositions of the present invention. Particularly preferably, the polyolefin is polyisobutylene,
It has 175 carbon atoms, preferably 35 to 150 carbon atoms. The polyamine used is preferably N-polyisobutylene-N',N'-dimethyl-1,3
- diaminopropane. The amount of said polyolefin and alkyl- or alkenyl-containing polyamine in the gasoline composition of the present invention is preferably 100% each.
~1200 ppmw and 5-200 ppmw. Suitably, the composition further contains a nonionic surfactant such as an alkylphenol or an alkyl alkoxylate. Examples of this type of activator include C4 to C18
Alkylphenols and C2-C6 alkyl ethoxylates or C2-C6 alkyl propoxylates or mixtures thereof. The amount of activator is preferably 10-1000 ppmw. The composition may also include detergents such as polyolefin-substituted succinimides. Suitable examples of such detergents include the polyolefin-substituted succinimides described in EP-A-271,937. The amount of detergent is preferably between 10 and 10
00 ppmw.

The gasoline composition of the present invention contains as a main component a gasoline suitable for use in spark ignition engines (base fuel). This includes 30 to 2 of the gasoline boiling point range.
Includes hydrocarbon base fuels that boil at 30°C. The base fuel may be a mixture of saturated, olefinic and aromatic hydrocarbons. These are obtained by straight-run gasoline, synthetic aromatic hydrocarbon mixtures, thermal or catalytic cracking of hydrocarbon feedstocks, hydrocracking of petroleum fractions or catalytic reforming of hydrocarbons. The octane number of the base fuel is not particularly critical, but is generally 65 or higher. In this gasoline, considerable amounts can be replaced by alcohols, ethers, ketones or esters. The base fuel should, of course, be substantially anhydrous since water would interfere with smooth combustion.

The alkali metal salt of the partial ester may be added to gasoline individually or mixed with other additives and added to gasoline. A preferred method of adding these salts to gasoline is to first make a concentrated composition of these salts, then calculate the desired amount of the concentrated composition and add it to the gasoline.

The invention thus further provides a gasoline-miscible diluent and 20 to 50% by weight of the diluent of the general formula:

[0033]

[C5]

[0034] An alkyl group in which n is an integer from 4 to 25, R is a C6-C20 alkyl group, and each R1 independently represents a hydrogen atom or a C1-C10 alkyl group] Succinic acid derivatives of polyether alcohols [15 to at least one alpha carbon atom]
having as a substituent an unsubstituted or substituted aliphatic hydrocarbon having 200 carbon atoms, which is optionally bonded to another alpha carbon atom via a hydrocarbon moiety having 1 to 6 carbon atoms to form a ring structure ] and an alkali metal salt of a partial ester.

Suitable gasoline-miscible diluents are hydrocarbons such as heptane, alcohols or ethers such as methanol, ethanol, propanol, 2-butoxyethanol or methyl tert-butyl ether. Preferably, the diluent is an aromatic hydrocarbon solvent, such as toluene, xylene, a mixture thereof or a mixture of toluene or xylene with an alcohol. The concentrated composition may further include antifogging agents, particularly ethoxylated alkylphenol-formaldehyde resins of the polyether type. When the antifogging agent is used in a concentrated composition, the amount thereof is preferably 0.01 to 1% by weight based on the diluent.

The present invention further provides a gasoline composition suitable for use in a spark ignition engine comprising gasoline as a main component, having the general formula:

[0037]

[C6]

an alkyl group in which n is an integer from 4 to 25, R is a C6-C20 alkyl group, and each R1 independently represents a hydrogen atom or a C1-C10 alkyl group] Succinic acid derivatives of polyether alcohols [15 to at least one alpha carbon atom]
having as a substituent an unsubstituted or substituted aliphatic hydrocarbon having 200 carbon atoms, which is optionally bonded to another alpha carbon atom via a hydrocarbon moiety having 1 to 6 carbon atoms to form a ring structure Also provided is the use of the alkali metal salts of partial esters with as ignition aids or valve antiblocking agents.

[0039]

EXAMPLES The invention may be better understood by the following examples.

Example 1 Number average molecular weight (Mn
) 280 and maleic anhydride were heated to 180° C. and stirred in a nitrogen atmosphere. Chlorine was then passed through the reaction mixture for 5 hours, during which time the reaction mixture was kept at 180° C. for an additional 4 hours. The polyisobutylene/maleic anhydride/chlorine molar ratio in the reaction mixture was 1.0/1.5/1.12. Polyisobutenyl succinic anhydride obtained by distilling off excess maleic anhydride has an acid value of 5.9 mmol/g.
Met.

[0041] A mixture of the polyisobutenyl succinic anhydride (100 g) obtained above and general formula (I) in which n is 5, R is C12 to C15 alkyl, and R1
is a methyl group, alkyl polyether alcohol (
“Oxi” from a company belonging to the Royal Dutch Shell Group
lube-500”) (148
g) for 5 hours under atmospheric pressure for a further 20 m
Heated at 200 °C for 1 hour at mHg, acid value 2.1 m
mol/g of partial ester was obtained. After cooling, the partial ester thus obtained (100 g) was dissolved in xylene (
The resulting solution was mixed with a methanol solution of potassium hydroxide (8.5 g of 83% by weight potassium hydroxide dissolved in 21.2 g of methanol). After heating the reaction mixture to 65° C. for 3 hours, the reaction mixture was filtered, leaving a filtrate. Purification of this yielded the desired salt (potassium ratio 4.4 mol%).

Example 2 Number average molecular weight (Mn
) Polyisobutylene with 340 (280 g)
and maleic anhydride (196 g) for 16 hours 20
Heated to 0°C. Thereafter, excess maleic anhydride was distilled off to yield polyisobutenyl succinic anhydride with an acid value of 5.3 mmol/g.

[0043] The polyisobutenyl succinic anhydride (303.9 g) obtained above and the general formula (I
) of alkyl polyether alcohol (405.5 g
) was heated to 200°C under atmospheric pressure for 3.5 hours and then at 20 mmHg for 1 hour. The acid value of the obtained partial ester was 1.04 mmol/g. The partial ester (681 g) thus obtained was mixed with xylene (50 g).
This was heated to 65°C for 3 hours with a methanol solution of potassium hydroxide (8.5 g of 83% by weight potassium hydroxide dissolved in 21.2 g of methanol), and the reaction mixture was filtered and purified. By doing so, the desired salt (potassium ratio: 4.0 mol%) was obtained.

Example 3 In the same manner as described in Example 2, in general formula (I), n
is 5, R is a mixture of C9-C11 alkyl, R1 is a hydrogen atom, and the alkyl polyether alcohol has a number average molecular weight (Mn) of 380 by gel permeation chromatography (from a company belonging to the Royal Dutch Shell Group). “Dobanol 91-5”
The alkyl polyether alcohol described in Example 2 was synthesized from the potassium salt of the partial ester (available under the trade name .

Example 4 In a similar manner as described in Example 2, a 1:4 mixture of C12-C15 alkanol, propylene oxide and ethylene oxide was prepared.
．． 2:5.6 molar ratio condensate (ASTM D12
Density at 20°C 0.98 according to 98; ASTM D227
Viscosity index by 0 186; number average molecular weight (Mn)
700; available under the trade name "Oxilube-501" from a company affiliated with the Royal Dutch Shell Group) and polyisobutenyl succinic acid, the alkyl polyether alcohol described in Example 2 was converted into the above condensate. Synthesized instead.

Example 5 Number average molecular weight (Mn
) 353 polyisobutylene (45 kg) and maleic anhydride (25 kg) were heated at 200 °C for 16 hours.
It was heated to Excess maleic anhydride was distilled off to obtain polyisobutenyl succinic anhydride (acid value 4.04 mmol/g; residual maleic anhydride 0.1% by weight or less; polyisobutylene 21.7% by weight).

A mixture of the polyisobutenyl succinic anhydride (35 kg) obtained above and the alkyl polyether alcohol of general formula (I) described in Example 1 (35.2 kg) was heated under atmospheric pressure for 4.5 hours. It was heated to ℃. The obtained partial ester had an acid value of 1.04 mmol/g. This partial ester (69 kg) was mixed with xylene (3
0 kg) and a methanol solution of potassium hydroxide (
The 25% by weight solution was reacted with 17 kg) at 65° C. for 3 hours. When this material is filtered and purified, the potassium ratio is 2.10.
% of the desired salt by weight was obtained. The non-volatile content concentration is 61
．． It was 1% by weight.

EXAMPLE 6 One method of predicting what is likely to occur in a vehicle engine under specific operating conditions is to remove light components (ie, components that boil below 350° C.) from an additive package (blend). ), and examine the appearance and viscosity characteristics. In this sense, additive packages A~ shown in Table 1
H was distilled on a rotary evaporator for 1 hour at 140° C. and 1.3 Pa to remove light components. The viscosity of the remaining residue was measured by ASTM D445. The results are shown in Table I. The additive used here was Additive I (N-polyisobutylene-N',N'-dimethyl-1
, 3-diaminopropane; this polyisobutylene has an average molecular weight of 1350 by gas phase osmometry); Additive II (polyisobutenylpotassium succinate; this polyisobutylene has an average molecular weight of 950 by gas phase osmometry); Additive III (Polyisobutylene having a number average molecular weight of 650 by gel permeation chromatography; Additive IV (Formula II, where R2 is C12-C
ASTM D445
The kinematic viscosity at 20℃ is approximately 80mm2/s
a polyoxyalkylene glycol hemiether;
“Oxi” from a company belonging to the Royal Dutch Shell Group
(commercially available under the trade name "lube-949").

It is well known that there is a direct correlation between the viscosity of the additive package residue and the valve sticking tendency of the additive package; the higher the viscosity of the additive package residue, the more likely the valve sticking tendency is. big. According to Table I, the residues of additive packages C to H containing the products of Examples 1, 2 and 4 are the same as those of conventionally known additive packages A and B.
It is clear that it has a lower viscosity compared to that of . Therefore, it follows that additive packages C-H will also have less tendency to valve sticking than that of additive packages A and B.

[0050]

[Table 1]

Example 7 For additive packages A, B and C, Volksw
An intake valve adhesion test was conducted using an Agen Transporter (VW) according to the following procedure.

[0052] First, the vehicle was run for 50 km on basic fuel,
Flushed the fuel system. Then, in place of the mixture of base fuel and any of additive packages A, B and C, 112
I did a mileage test. During this distance run, the vehicle was subjected to a high temperature soak period, an idling period, and a period of driving at 24, 40, and 56 km/hr in second, third, and fourth gears, respectively. During the high temperature soak period, stop the vehicle engine and
Leave for 0 minutes. Also, during the idling period, the engine of the vehicle is left running and stopped for 30 seconds.

After the running test, the vehicle is parked overnight in a refrigerated trailer at -16°C. The next morning, determine the maximum compression pressure for each cylinder to assess valve stickiness.

Similarly, additive packages A, B and C are placed in the Vauxhall Cavalier (VAUX).
Tested with.

The results are shown in Table II, and the average maximum compression pressure of additive package C was higher than that of conventional additive package A.
When compared with the conventional additive package B, it was high for both VW and VAUX, and when compared with the conventional additive package B, it was also high for VW.

[0056]
Table II Additives Storage temperature Vehicle type Compression pressure (bar) Package (℃)
No. 1 No. 2 No
．． 3 No. 4 Average A
-16 VW
9.1 0 9.0 9
．． 3 6.9 A
-16 VAUX 0
10.8 10.8 0
5.4 B-16
VW 9.4 0
8.5 9.5 6.9
B-16 VA
UX 10.5 10.5 10.
6 10.3 10.5 C
-16 VW 10.1
9.5 8.5 10.0
9.5 C-16
VAUX 10.3 8.5
10.9 11.0 10.2 Example 8 For the purpose of performance test of additive auxiliary agent (Spark Ader),
1. An optical observation means is provided in the combustion chamber of one of the cylinders.
Tested using a 3 liter Astra engine. The compression ratio of the cylinder considered in the test was 5.8:1. For each test, the engine was operated at 2000 rpm.
It was operated for a certain period of time, and measurements were taken continuously during this period. From the measurements obtained, it was possible to determine the periodic fluctuation reduction of the apparent mean effective pressure (IMEP) for each additive auxiliary. This test tested unleaded gasoline with no potassium additive;
It was carried out with unleaded gasoline containing 4 and 8 ppmw of potassium. This potassium component consists of polyisobutenyl succinic acid (the polyisobutylene portion has a number average molecular weight of 280 as determined by gel permeation chromatography) and the general formula (
In I), n is 5, R is a mixture of C12 to C15 alkyl, and R1 is a methyl group (available under the trade name "Oxilube-500" from a company belonging to the Royal Dutch Shell Group) ) was added in the form of a partial ester salt. Test results are shown in Table III.

[0057]

Claims (10)

[Claims] Claim 1: Gasoline suitable for use in spark ignition engines as the main component and the general formula as a minor component:
] [In the formula, n is an integer from 4 to 25, and R is C6
-C20 alkyl group, and each R1
succinic acid derivatives of alkyl polyether alcohols [where at least one alpha carbon atom is substituted with an unsubstituted or substituted aliphatic hydrocarbon having 15 to 200 carbon atoms] a gasoline composition comprising an alkali metal salt of a partial ester of a compound having as a group, optionally bonded to another alpha carbon atom to form a ring structure via a hydrocarbon moiety having 1 to 6 carbon atoms. . 2. The gasoline composition according to claim 1, wherein the alkali metal is potassium. 3. Gasoline composition according to claim 1, wherein said aliphatic hydrocarbon is obtained from a polyolefin of monomers having 2 to 6 carbon atoms. 4. A gasoline composition according to claim 1, wherein the aliphatic hydrocarbon has 15 to 45 carbon atoms. 5. A gasoline composition according to claim 1, wherein R is a C9-C15 alkyl group. 6. Furthermore, as minor components, polyolefins from monomers of 2 to 6 carbon atoms and/or of the general formula:
R2 O-[(EO)m (PO
)t ]-H (II
) [where EO represents ethyleneoxy; PO represents propyleneoxy; R2 represents C1-C20 alkyl; m and t represent the average number of ethyleneoxy and propyleneoxy in each hemiether molecule; m /(m+
t) is in the range from 0 to 0.5; t/(m+t) is in the range from 0.5 to 1; the number average molecular weight (Mn) of the hemiether is from 500 to 3000]. ether, and C20
˜C150 alkyl- or alkenyl-containing polyamine. 7. The gasoline composition of claim 6, comprising 100 to 1200 ppmw of polyolefin and/or polyoxyalkylene glycol hemiether and 5 to 200 ppmw of alkyl- or alkenyl-containing polyamine. 8. A gasoline-miscible diluent and 20 to 50% by weight of the diluent having the general formula: [Image Omitted] where n is an integer from 4 to 25 and R is C6
-C20 alkyl group, and each R1
succinic acid derivatives of alkyl polyether alcohols [where at least one alpha carbon atom is substituted with an unsubstituted or substituted aliphatic hydrocarbon having 15 to 200 carbon atoms] alkali metal salts of partial esters of esters of esters, which are bonded to other α carbon atoms to form ring structures via hydrocarbon moieties having 1 to 6 carbon atoms, as the case may be. A concentrated composition suitable for the addition of. 9. A method for operating a spark-ignition internal combustion engine, which comprises introducing the gasoline composition according to any one of claims 1 to 7 into the engine. 10. In a gasoline composition suitable for use in a spark ignition engine comprising gasoline as a main component, the general formula: [wherein n is an integer from 4 to 25 and R is C6
-C20 alkyl group, and each R1
succinic acid derivatives of alkyl polyether alcohols [where at least one alpha carbon atom is substituted with an unsubstituted or substituted aliphatic hydrocarbon having 15 to 200 carbon atoms] ignition aids or alkali metal salts of partial esters, which are optionally bonded to other alpha carbon atoms via a hydrocarbon moiety having 1 to 6 carbon atoms to form a ring structure. Use as a valve anti-stick agent.