DE1148343B - Grease and process for its manufacture - Google Patents

Description

The invention relates to lubricating greases based on a mineral oil or synthetic oil a content of a mixture of calcium salts or soaps. The greases according to the invention have has a high degree of effectiveness over a wide range of difficult working conditions. Included the lubricating greases in equilibrium proportions of salts of fatty acids low and medium Molecular weight and soaps of fatty acids of high molecular weight and are thereby characterized in that the molar ratio of the high molecular weight acids to the medium acids Molecular weight is less than 1: 1.

It is known that greases lose some or all of their effectiveness, if they are subjected to difficult working conditions, especially if they are in the company exposed to high temperatures. This is the case, for example, with the lubrication of machine parts It is essential that a grease retains its structure during use. If this isn't the If so, there is a high consumption of grease and also the need for frequent renewal. In general, the known lubricating greases have the distinct disadvantage that they change their properties when used over a wide temperature range, in particular at high temperatures of the order of 120 to 180 ° C and higher. Some common ones Lubricating greases exhibit excessive softening properties when they are high in service Exposed to temperatures; this quickly removes them from the surfaces that are being lubricated should, ejected, so that no effective lubrication is obtained.

The effect of water, i.e. H. Both salt water and fresh water, can cause the The grease is diluted and leaks from the lubricated surfaces. This is a major factor in the lubrication of grease-lubricated machine parts in port facilities, on the deck of ships, in Steel rolling mills, water pumps of all kinds, in mining machines or oil drilling rigs. In many such In cases, relatively high temperatures are developed, so that even lime-based greases, which are very resistant to water, become unstable. You already have a number of Adding modifiers to the various types of grease to improve their stability; however, such modifiers are generally relatively expensive; also lead some of them to a detriment to individuals

Grease
and its method of manufacture

Applicant:
Socony Mobil Oil Company, Inc.,

New York, N.Y. (V. St. A.)

Representative:

Dr. E. Wiegand, Munich 15, Nussbaums ”. 10,

and Dipl.-Ing. W. Niemann, Hamburg 1,

Patent attorneys

Claimed priority:
V. St. v. America April 29, 1955 (No. 505 063)

Clarence Liddy, Brooklyn, NY (V. St. A.),
has been named as the inventor

or the various desirable properties of the fats.

Metal salts of low molecular weight carboxylic acids and soaps of high molecular weight carboxylic acids are used for production known from fat thickeners in the form of a mixture or a soap-salt complex. For the production this fat thickener one uses saturated or unsaturated high molecular weight fatty acids with about 18 to 24 carbon atoms together with low molecular weight carboxylic acids such as acetic acid, propionic acid, Alkoxypropionic acid.

According to a known process for the production of lubricating greases, salts are used as thickeners from the paraffin oxidation occurring trailing and leading fatty acids are used, whereby the leading fatty acids can be wholly or partially replaced by acetic acid. The thickeners of these well-known lubricating greases On the one hand, they also contain low molecular weight fatty acids if first-run fatty acids are used in addition to acetic acid Carboxylic acids with 3 to 7 carbon atoms in the molecule, but on the other hand they contain no main run fatty acids with 14 to 19 carbon atoms in the molecule. If according to a preferred Embodiment of the known method, the first run fatty acids are completely replaced by acetic acid the fat thickener consists exclusively of salts of acetic acid and high molecular weight carboxylic acids with 19 or more carbon atoms in the molecule. These known lubricating greases have a very

309 579/263

3 4

soft consistency and relatively low consumption. They are when used under high dropping points of no more than 210 ° C. Temperatures such as 120 to 180 ° C or more is already a lubricating grease consisting of higher, effective. They retain over a wide range of lubricating oil, e.g. B. a mineral lubricating oil, which from working conditions has its original ches through a mixture of metal salts of vinegar character. Furthermore, they are acidic in the presence of at least one fatty acid of medium molecular weight, even if they are brought into contact at high temperatures with water by weight and at least one fatty acid with high molar mass. A kular weight has been thickened, it has been proposed, with particular advantage of the invention that the salt mixture is anhydrous, the acids cial fatty acid salts or soaps with a large number of average molecular weights 7 to 10 carbon io of carriers which have comparable application own atoms and the acids of high molecular weight 14 are compatible,
to 30 carbon atoms in the molecule, according to the invention, these lubricating greases can be prepared in a molar ratio of acetic acid to medium acids by having the relevant acids and high molecular weights less than 5: 1 and a calcium compound in a larger and the molar ratio of Acids high to the acid 15 part of the oil heated, the amount of ren mean molecular weight in the range of 1: 1 calcium compound is such that it is 0.02 to 10: 1. 35%, preferably 4 to 12%, below that for the full The invention relates to a lubricant permanent neutralization stoichiometrically required fat based on a mineral oil or synthetic total amount of calcium compound, oil with a content of a mixture of Calcium - 20 whereupon the resulting acid mixture dehydrates, salt or soaps of (I) unsubstituted straight - the remaining chain saturated carboxylic acids required for the formation of the grease from a small amount of the oil and an additional amount of molecular weight with 1 to 6 carbon atoms each Calcium compound is added, which from molecule, (II) unsubstituted saturated, is sufficient to essentially completely neutralize the residual acidity in the case of monocarbon monocarbons having methyl side chains.

acids with an average molecular weight of 7 to 12, The invention is based on the knowledge that

in particular 7 to 10 carbon atoms per molecule of lubricating greases with excellent stability from the

and (III) saturated or unsaturated monocarbon combinations of calcium salts or

acids with no more than one double bond or soaps of different fatty acids in equilibrium

monooxy-substituted monocarboxylic acids with more than 30 standing fractions can be obtained, with

than 12 carbon atoms per molecule, in which the calcium among the alkaline earth metals

the molar ratio of the acids (III) to the acids (II) is particularly suitable for the formation of fatty acid salts

is less than 1: 1. For each of the groups I, and soaps with the desired properties,

II and III calcium salts or soaps of different types.

Acids of the group concerned be present. 35 The applied ratio of acids, especially according to A particular embodiment of the acids (II) and (III) is critical. Both of them Lubricating greases of the invention the acids in the following, for example, causes the application of an inadequate Have distribution: the amount of caprylic acid in general that the

Product hardens excessively on storage; an over-

Acid (I) ₄₀ addition of caprylic acid causes in the product

about 10 to 60 percent by weight, excess oil bleeds out during storage. An un-

in particular correct balance is also established when

about 25 to 46 percent by weight too little or too much acid of high molecular

Acid (II) weight, such as stearic acid, is used. Too little

"- t · -ο .r, · t +5 stearic acid results in oil bleeding during storage and

about 25 to 48 weight percent poor work stability, and excessive

Acid (III) amount of stearic acid is for undesirable changes

about 16 to 50 percent by weight wrestled with storage and a reduced dropping point responsible.

where the molar ratio of acids (III) to acids 50 typically for the straight (II) in question is always less than 1 and, for example, 0.3 to chain saturated monocarboxylic acids as low as 0.4 (cf.Examples and Table I) . Molecular weight are acetic acid, propionic acid, it can be used in the lubricating greases according to the invention butyric acid, valeric acid and caproic acid. Acetic acid is particularly desirable as a mixture of calcium salts or soaps in these, because it produces extremely good products in an amount of about 10 to 15%, based on the product.
Total weight of grease. Typical of the saturated monocarboxylic acids, the oil can also be made from a mineral oil with a viscosity of about 60 to 6000 SUS at 38 ° C, according to a further particular set of molecular weights that can be used - Capric acid, undecylenic acid, lauric acid and confess. According to the invention, there is also the possibility of mixed unsubstituted C ₈ , C _1n and C ₁₂ acids with the possibility that a naphthenic oil has methyl side chains which, according to the oxo method, have a viscosity of about 700 to 800 SUS are holding. Of these acids, those be -38 ° C are used. The oil may preferably contain 7 to 10 carbon atoms per molecule from about 70 to 95 percent by weight and the salt. Caprylic acid, capric acid and pelargon or soap mixture can be particularly advantageous in an amount of about 65 acid.
5 to 30 percent by weight. For the mono-greases to be used according to the invention, the lubricating greases according to the invention have a high molecular weight carboxylic acids are typical: special stability under difficult working conditions- saturated aliphatic acids, such as myristic, pahnitic,

Stearic, arachidic, behenic, lignoceric, cerotic acid; unsaturated aliphatic acids with a single double bond such as oleic acid; monooxy-substituted Monocarboxylic acids such as 9-oxystearic acid, 10-oxystearic acid and 12-oxystearic acid; and their corresponding isomers with side chains. Preferred are again the saturated acids, especially stearic and palmitic acids.

It should be noted that the high-molecular-weight acids

The temperature of the oil is sufficient to melt any acids that are added; in general the temperature is around 65 to 71 ° C. The acids, e.g. B. a mixture of acetic acid, caprylic-5 acid and stearic acid, are added to the kettle. Then a lime-oil-sludge is added. When the acids and lime are added, the temperature inside the kettle increases held between about 71 and 82 ° C. In order to

to use which contains an amount of high molecular weight acid that is within the above specified critical area.

In terms of their technical availability, calcium salts and soaps formed well in the oil To keep the form, in the pure state and in the form of their dispersed, it is desirable to keep the constituents appropriate Fats and oils and especially parts by a pump or another suitable one can be used in hydrogenated form. To let the device circulate in this stage, However, they are homely in their commercially available The Mixture of Oil and Fatty Acid Salt or

Available form for use. It is 15% soap, which can be considered a concentrated mixture necessary, that amount of a material can endeavor, is to a temperature of about

Heated at 149 ° C and higher so that it is dehydrated. After the temperature has been increased from about 71 to 82 ° C to about 104 ° C, care must be taken

The mineral oil components of the lubricating greases carried so that excessive foaming of the invention can be considerably prevented in theirs. Foaming can differ depending on the properties of a SiIi. In general, con or a similar additive is inhibited or such oils are prevented by a Saybold viscosity. In general, if one draws, which is about 40 seconds at 38 ⁰ C temperature of 138 ° C is reached is greater than that is water, and preferably containing about 60 to about 6000 seconds 25 of the concentrate sufficiently low such that at 38 ° C amounts to. However, it has been found that foaming is no longer a problem. If the concentrate essential to the nature of the mineral oil used is dehydrated, there is a tendency to lump the character of the grease composition and it is therefore essential that it be affected. For example, a naphthenic provides sufficient agitation applied to keep all oil (750 SUS at 38 ° C) greases of more fibrous 3c materials well dispersed. Consistency, while a paraffinic oil of when a temperature of approximately 154 ° C

The same viscosity as lubricating greases of smoother or higher is reached, the mixture begins to produce a Structure leads. Instead of the entire mineral oil, assume a thicker consistency. The mix is component or part of it can still be acidic at this stage. The rest of the oil components oils of lubricating viscosity are used. 35 nents, generally about two-thirds of the total Such oils include synthetic carriers, the oil batch is now added. During the addition Esters of aliphatic dibasic acids, SiIi- the remaining oil, it is necessary that the cone, silicate ester, ester of phosphorus-containing mixture is sufficiently stirred or homogenized, Acids, fluorocarbon compounds, etc. include. essentially complete dispersion Typical of such synthetic oils are: Di- (2-ethyl- 4.0 of the fatty acid salt or soap phase in the liquid hexyl) sebacate, dibutyl phthalate, di (2-ethylhexyl) oil carriers. It will then be enough adipate. Other suitable synthetic oils consist of lime powder added to the kettle to make the fat alka-esters of polyalcohols and monocarboxylic acids. Generally there is an excess such as polyethylene glycol di- (2-ethylhexoate). That of the alkali content of 0.3% (calculated as CaO) for Synthetic carriers are most suitable for making the finished fat desired. After adding the Positioning of lubricating greases for use with air-lime powder is the resulting mixture again vehicles, as such lubricating greases drain their lubricating value. For the entire duration of the addition Over a wide temperature range of roughly that of oil and lime powder, the mixture becomes one Maintain -73 to 260 ° C. Maintained temperature of 149 ° C or higher. To

The oil component - regardless of whether it is 50% of the final drainage will be with the cooling mineral oil or synthetic oil or started a grain cycle. There will be some additional combination is about it - is generally incorporated into substances or inhibitors, and the fat becomes Quantities in the range of about 70 to below about 82 ° C for withdrawal from the boiler, about 95% by weight of the finished grease together - A lubricating grease typical of the invention,

Settlement used. The calcium salts or soaps of 55 are described in the example below: aforementioned acids are used in such an oil component in amounts ranging from about 5 to example incorporated about 30 percent by weight.

Although the lubricating greases according to the invention according to 18 parts by weight of a naphthenic mineral oil

60 (750 SUS at 38 ° C) were prepared in a mixture with 3.5 Gewerden it has been found that parts by weight of acetic acid and 3.4 parts by weight of caprylic fats Extraordinary quality acid and 2.0 parts by weight of stearic acid are obtained in one can when a new working or process fat boiler is introduced. The mixture was on is properly followed. It is then heated to -71 ° C and (generally about 10 minutes) Measured worked: Part of the oil component, kept at this temperature until all acids are in generally a third of the oil required for the finished oil was dispersed. A lime flour sludge, the same amount, the 3.3 parts by weight of lime and 18.0 parts by weight of the and the kettle was heated in such a way that it contained mineral oil, was added to the kettle.

adds. The temperature of the contents of the boiler was finally increased to 154 ° C, and after lingering about 10 minutes at this temperature began to increase in the consistency of the mixture. It additional mineral oil - 51.5 parts by weight - was then added. After the mineral oil of the Mixture was intimately incorporated, a further 0.3 parts by weight of lime powder was added to the contents of the kettle. Heating of the mixture was continued at 154 ° C until all foaming had stopped and the mixture had taken on a thicker consistency again. At this stage the heating was stopped of the kettle and started to cool the mixture. After a temperature of 82 ° C was reached, the fat thus formed was withdrawn from the kettle.

The composition of the grease described in the example is shown in Table I below, in which it is referred to as lubricating grease 1. Various are also shown in the table for comparison purposes further lubricating greases according to the invention shown, which are designated with lubricating grease 2, 3 and 4, respectively, while the grease 5 only salts of fatty acids with low and soaps of fatty acids with high Contains molecular weight. Greases 2 to 4 were prepared in the same way as in Example is described. Grease 5 was prepared by a conventionally known method.

The values in Table I show various physical properties of the various greases. The consistency was determined in accordance with ASTM regulation D 217-48 “Cone Penetration of Lubricating Grease «definitely. The dropping point was determined according to ASTM regulation D 566-42. The properties of the grease as the wheel bearing grease were determined according to the method described in "Manual of ASTM Standards on Petroleum Products and Lubricants", Appendix I, pp. 619 to 624 described is.

The effect of water on grease stability was determined according to the following procedure: 90 g of fat was placed in a rolling stability tester as described in "The Institute Spokesman", Vol. 6, No. 12, p. 4, March 1943, described i &. It was also 1% water, based on the Weight of the fat batch added. The mixture of fat and water was at 160 rev / min. Rolled for 2 hours, after which the mixture was removed from the tester. The micro-penetration the mixture was then determined for comparison with the original micro-penetration, which was preserved with the dry fat in its original state. After the micro-penetration When the rolled fat was determined, the fat was placed in an oven at 71 ° C for 16 hours stored. After this storage time, the fat was cooled to room temperature (21 to 26 ° C) Micro-penetration value determined again. The change in micro-penetration values after the rolling period and after the storage period compared with the original micro-penetration value of the original Fats are referred to as "percent hardening" or "percent softening". It is desirable that a fat after a test of this type did not change more than about 25%, either softening or hardening, shows. When performing this test, 1% water was chosen as it was found has been that this amount of water pollution under actual working conditions is prevalent in this area.

Table I.

example
3

0.33

Molar ratio of acid (III) to acid (II)

Fatty acid mixture (%) *

Cottonseed fatty acids (° / o)

Purified montan wax (%)

Acetic acid (%)

Caprylic acid (%)

Pelargonic Acid (%)

Stearic acid (%>)

Oleic acid (° / o)

Lime flour (%)

Paraffinic oil, 100 SUS at 38 ° C (%) .... Naphthenic oil, 750 SUS at 38 ° C (Vo) .. Weight of fatty acids in the mixtures (%) ASTM penetration at 25 ° C,

raw

fulled

ASTM drop point ( ⁰ C)

CRC wheel bearing test

*) Fatty acid mixture of 85% stearic acid and 15% palmitic acid, obtained by hydrogenating vegetable oleic acids.

3.5 3.4

2.0 3.60

87.5 8.9

311 310 260 good 0.30

3.5
3.4

1.0
1.0
3.6

87.5
8.9

330
322
260
Well

0.40

3.5
3.0

2.4
3.6

87.5
8.9

260
250
260
Well

0.33

2.2

8.5
5.0

4.4

79.9
15.7

359
316
260

5.5
5.5
2.0
2.0

3.4
81.6

13.6

350
400
140
fails

Table I (continued)

10

1 I 2 example ^4th 5 120 I. 15th 25th 71 ° C. for 16 hours followed 132 1% water to fat ³ added and fat-water mixture Influence of water on fat stability Subjected to the rolling stability test for 2 hours, whereupon 154 70 135 a storage at 90 - 20th 97 Original micro-penetration 118 60 (dry fat) 85 Micro-penetration 155 15th after 2 hours of rolling 100 after 16 hours of storage at 71 ° C Change from the original state (Här tion) (° / o)

It can be seen from the values shown in Table I that greases 1 to 4 are excellent Have drop points (260 ° C). This is in contrast to the grease 5, which is one essential has a lower dropping point (140 ° C). It should also be noted that greases 1 to 3 pass the wheel bearing test suffice, while with grease 5 this is not the case. Furthermore, the greases 1 hardened up to 3 only by 15 to 25% when testing the fat stability to water as opposed to one 85% increase for grease 5. It should also be noted that greases 1 to 3 are only approximate Contain 65 to 70% of the acids which are required for lubricating grease 5, and that nevertheless the Greases 1 to 3 are superior to grease 5 in every respect.

The effect of the various mineral oil carriers on the fat structure is shown by comparing Grease 1 prepared with a naphthenic oil illustrated with grease 6 prepared with a paraffinic oil is prepared. The methods of manufacture and the quantities of materials used were the same in each case, only the type of oil was changed. A comparison of the greases 1 and 6 are given in Table II below.

Table II

Grease 1 Grease 6 Oil (750 SUS
at 38 ° C) naphthenic paraffinic penetration
at 25 ° C,
raw 311 366 fulled 310 309

As indicated above, fatty acid salts or soaps are of alkaline earth metals other than calcium not effective with the compositions. This fact is illustrated by Table III, which gives comparative values for barium salts and barium soaps (lubricating greases 7 to 15).

Table III

10 example
11

12th

14th

15th

Stearic acid (° / o)

oleic acid (%)

Caprylic acid (%)

Acetic acid (%)

Ba (OH) ₂ 8 H ₂ O (%) ...
Glycerine (%)

Naphthenic oil,

750 SUS at 38 ° C (%)

Characteristic of the end product

5.88 I 6.19

10.00

2.94

22.38

10.52

1.56

19.80

58.80 I 61.93

10.24

6.03

3.01

20.47

60.25

25.58

54.32

13.50 5.70 5.55 8.77 - 11.40 - - 3.07 2.85 9.43 5.15 3.07 2.85 2.77 5.15 19.00 20.20 21.15 24.24 - - 5.55 5.15 61.36 57.00 55.55 51.54

5.39 10.78

2.69

2.69 19.15

5.31

53.99

Separation *)

*) "Separation" means separation of the barium salt or barium soap from the oils; in other words, the soap etc. settled to the bottom of the fat kettle and the oil used formed a separate layer. Such compositions are not satisfactory.

The critical nature of calcium salts or soaps is further illustrated by the fact that Attempts to reduce the calcium salts and soaps in the compositions in question here by Al-

309 579/263

Replacing potash salts and soaps has not been successful. Grease 16, 17 and 18 different from the one in the table IV compositions have been found to show separation on standing. These Lubricating greases were prepared according to the procedure described in the example, with only one Change of metal component took place.

Table IV

18th

16 17th 3.9 2.6 7.9 7.7 3.9 7.7 5.6 ^a > 5.4 ») 78.7 76.6 15.7 18.0 separation

Fatty acid mixture * - - 11.5

Acetic acid (o / o) 3.9 2.6 1.9

Caprylic acid ("/") 7.9 7.7 5.7

Oleic acid (° / o)

Metal compound («/») .... 5.6 ^a > 5.4 ») 4.6 ^b >

Paraffinic oil,

100 "SUS at 38 ° C ..

Naphthenic oil,

750 "SUS at 38 ° C ° / o) 78.7 76.6 76.3

Weight in fatty acids in

the mixtures ( ^fl / o) ... 15.7 18.0 19.1

Characteristic of the end product

a) LiOH · H ₂ O.

D) NaOH.

*) Fatty acid mixture of 85% stearic acid and 15% palmitic acid, obtained by hydrogenation of vegetable oleic acids.

With regard to the calcium component of the fatty acid salts or soaps in the lubricating greases according to the invention it can be seen that calcium oxide, calcium hydroxide or calcium carbonate with the aforementioned Acids can be reacted to create the desired products.

It should be noted that the type of grease used in the manufacture of the invention is the type Acid is very critical. For example, the acids are medium molecular weight from 7 to 12 carbon atoms on those acids that have a straight hydrocarbon chain and on theirs Methyl isomers, d. H. those acids with a single carbon atom in one or more side chains limited. It has been found that when the side chain increases to only 2 carbon atoms becomes, the resulting acid for the grease 5 <> composition is no longer suitable. In this context, a mixture of 2-ethylhexanoic acid, Stearic acid and acetic acid exactly with a mixture of caprylic acid, and stearic acid Compare acetic acid in the manufacture of a calcium fat composition. It has been found that the use of 2-ethylhexanoic acid in a calcium stearate-calcium acetate fat causes that the resulting products are less likely to disperse in mineral oil than a caprylate grease. Following the procedure used in preparing the compositions described above, however, if the caprylic acid is replaced by 2-ethylhexanoic acid, there is generally no fat structure. After dehydration, the fatty acid salts or soaps separate from the oil. With In other words, the salts or soaps settle on the bottom of the fat kettle, and so does the oil used formed a separate top layer. This settled material did not disperse in the oil, even as later reheated a small amount in a coastal oil from SUS at 38 ° C to over 260 ° C became.

The lubricating greases according to the invention can also contain small amounts of other known additives and Contain fillers, for example antioxidants such as amines (e.g. phenyl-a-naphthylamine), Phe-

nols (e.g. 2,6-di-t.-butyl-4-methylphenol), agents for Improvement of the lubricity, such as free fat, free fatty acids, esters of alkyl and / or aryl acids, sulfurized fats, lead salts or soaps, etc. The lubricating greases according to the invention are for

suitable for a wide range of technical applications. For example, some are considered general-purpose automotive greases suitable to serve as chassis, wheel bearing and water pump lubricants; typical for one such grease is grease 1 described above. Others are general-purpose technical greases, as slide bearing and friction-reducing lubricating greases for normally and heavily loaded Machines or plants are used. In general, the greases according to FIG

Invention a range of semi-liquid types useful as textile machine lubricants to to solid block-like greases, such as those used in the lubrication of machines in steel rolling mills, paper mills, Cement mills, etc. can be used.

Claims (7)

PATENT CLAIMS: 1. Lubricating grease based on a mineral oil or synthetic oil with a content of a mixture of calcium salts or soaps of (I) unsubstituted straight-chain saturated carboxylic acids with 1 to 6 carbon atoms per molecule, (II) unsubstituted, saturated monocarboxylic acids with 7 methyl side chains up to 12, in particular 7 to 10 carbon atoms per molecule and (III) saturated or unsaturated monocarboxylic acids with no more than one double bond or monooxy-substituted monocarboxylic acids with more than 12 carbon atoms per molecule, characterized in that the molar ratio of the acids (ΓΠ) to the acids (II) is less than 1: 1. 2. Lubricating grease according to claim 1, characterized in that the acids are distributed as follows exhibit: Acid (I) about 10 to 60 percent by weight, in particular about 25 to 46 percent by weight Acid (II) about 25 to 48 percent by weight
Acid (III) about 16 to 50 percent by weight 3. Lubricating grease according to claim 1 or 2, characterized in that the oil in an amount from about 70 to 95 percent by weight and the Salzbzw. Soap mix in an amount of about 5 to 30 weight percent is present. 4. Lubricating grease according to one of claims 1 to 3, characterized by a content of about 10 to 15 percent by weight, based on the total weight of the grease, of the mixture the calcium salts or soaps. 5. Lubricating grease according to claim 1 to 4, characterized in that the oil base with a mineral oil a viscosity of about 60 to 6000 SUS at 38 ° C. 6. Lubricating grease according to claim 1 to 5, characterized in that the oil base is a naphthenic Is mineral oil with a viscosity of about 700 to 800 SUS at 38 ° C. 7. A method for producing a lubricating grease according to claim 1 to 6, characterized in that draws that the acid mixture and a basic calcium compound in a larger one Part of the oil is heated, the amount of calcium compound used being 0.02 to 35%, preferably 4 to 12% below that stoichiometrically required for complete neutralization Total amount, the acidic mixture dehydrates, is the amount required for the formation of grease The remaining amount of the oil is added and the remaining acidity is achieved by further adding the calcium compound completely neutralized. Legacy Patents Considered:
German Patent No. 1 040 164. © 309 579/263 4.63