JPH0641562A - Synthesis oil and motor oil, gear oil and hydraulic oil comprising same - Google Patents

Abstract

PURPOSE: To obtain synthetic oil useful for motor oil, etc., which contains a specific amount of cooligomer comprising specified proportions of a respectively specified alkene and alkyl (meth)acrylate, which has a specified viscosity behavior, and which is superior in shear stability and oxidation stability.

CONSTITUTION: This synthetic oil contains 5-50 pts.wt. of cooligomer comprising (A) 5-50%, by weight, of one or more 8-14C 1-alkene and (B) 50-95% of one or more (meth)acrylate of the formula (R₁ is H or methyl; R₂ is a 4-22C alkyl or cycloalkyl) and has a Newtonian viscosity behavior in a temp. range of 20-200°C at a shear gradient of 10-10⁷s^-1.

COPYRIGHT: (C)1994,JPO

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to synthetic oils with special properties, which are composed in part of cooligomers consisting of 1-alkenes and (meth) acrylic acid esters.

[0002]

BACKGROUND OF THE INVENTION Increasing demands on lubricating oils in machines, such as suitable viscosity ranges, high shear stability or oxidative stability, have led to the development of synthetic lubricants (synthetic oils). For example Kirk-
Othmer, “Encyclopedia of C
chemical Technology ", Volume 14,
Pp. 477-526, J. See Wiley, 1981). The above synthetic oil is also used as a hydraulic fluid (power transmission fluid). In general, synthetic oils have, for example, the following advantages over mineral oils: high thermal stability, long life, good cold flow properties, high viscosity index (VI), low friction loss,
Low volatility (for this "Kirk-Othme"
r ", vol. 12, p. 712-p. 733, J. Wil.
ey, 1980). Conventional synthetic oils belong to various classes of substances, polyethers, esters (monobasic and polybasic carboxylic acids with monohydric and polyhydric alcohols), phosphoric acids and phosphates, silicones, silicates. , Polyhalogenated hydrocarbons and fluorinated esters, as well as polyolefins and alkylaromatic compounds.

Different proportions of α-olefins, especially α-olefins having 8 to 12 carbon atoms, which can be prepared, for example, using Ziegler-Natta catalysts or by ionic polymerization.
Polymers with olefins are particularly important because of their good VI value and pour point. Mixtures of such α-olefin polymers, especially α-olefin oligomers and ester oils, have good miscibility with polar additives compared to the pure components. Furthermore, cooligomers or copolymers of α-olefin and (meth) acrylic acid ester are also of industrial interest as mineral oil additives. The copolymerized α-olefin significantly improves the thermal stability of the additive compared to pure polymethacrylate polymer.

US Pat. No. 4,419,106 discloses hydrocarbon oils and about 10 to 90% by weight of alkyl acrylate units having 8 to 20 carbon atoms in the alkyl group and .alpha.-olefin 90 to 10 having 12 to 40 carbon atoms. Consisting of copolymers from wt.%, Eg as determined by gel permeation chromatography or by light scattering 1
Pour point depressant having an average molecular weight Mw of 0 ³ -10 ⁵ Daltons (Stockpunktverbesser)
Described is a blended oil having a content. Oligomeric VI improvers consisting of three monomer groups are described in US Pat.
No. 8148 or German Patent (DE-A) 224
No. 3064. The improving agent is about 10 to 90% by weight of a 1-alkene having 4 to 32 carbon atoms, and about 1 kind or several kinds of alkyl (meth) acrylic acid ester having 8 to 34 carbon atoms in the alkyl group. ~ 35% by weight
And about 1 to 35% by weight of one or several alkyl esters of (meth) acrylic acid having 1 to 4 carbon atoms in the alkyl group or a homologous terminally unsaturated carboxylic acid. The molecular weight of such oligomers is preferably Mn = 10 ³ -4 × 10 ³ Daltons, underscoring the narrow molecular weight distribution achieved and the high unity of the products.

[0005] U.S. Patent No. 4,009,195 describes a oligomerization process, in the process C ₁ -C ₄ (meth) acrylic acid - alkyl ester 1-35% by weight percentage, C ₈ -C ₃₄ - With a proportion of 1 to 45% by weight of (meth) acrylic acid ester of alcohol, a polymerization initiator and 1-alkene 10 to 9 having 4 to 32 carbon atoms are continuously and simultaneously prepared.
To a mixture of 0% by weight, the molar ratio of acid derivative to 1-alkene in the reaction batch which occurs almost immediately is from 10 to ³ to.
Add it so that it remains relatively constant within the range of 0.2,
In that case, the addition is carried out at a temperature which does not impair the oligomerization. U.S. Pat. No. 3,994,958, derived from the same priority application as U.S. Pat. No. 4,091,195, describes reacting an oligomer according to U.S. Pat. ing. Furthermore, German patent (DE-A)
No. 3,232,694 describes copolymers of α-olefin and α, β-unsaturated dicarboxylic acid esters. At that time, the α, β-unsaturated dicarboxylic acid ester is, by definition, an alcohol component having 3 carbon atoms.
Containing 10 straight or branched chain monohydric alcohols,
Alpha-olefin has 10 to 16 carbon atoms. Optionally, the copolymer is crosslinked, the pour point of which should be between 0 and -60C. DE (DE-A) No. 3,245,298, can be produced by solution polymerization of (meth) C1 to C20 alkyl esters of acrylic acid, alpha-olefin and 1-alkenyl isocyanates, of 500 to ⁴ Dalton Copolymers having isocyanate groups within the molecular weight range are described. U.S. Pat. No. 4,526,950 discloses at least one α-olefin having at least 6 carbon atoms and at least one unsaturated carboxylic acid or α.
Starting from its derivatives copolymerizable with olefin
In the presence of a radical polymerization initiator, a mixture of the above components is heated to at least 135 ° C. in the absence of a solvent or diluent, in which case no excess of any of the reactive monomers is used to avoid the diluting action. Manufacturing methods are described.

Further, the claim of US Pat. No. 1,135,752 claims a copolymer of decyl methacrylate and 1-tetradecene having a molecular weight of 8,000 to 13,000 daltons as a lubricating oil thickener. From EP-A 217602, for example, ethylene copolymers with ethylenically unsaturated mono- or dicarboxylic acids or their esters (molecular weight Mn <1
Oil additives based on (having 000 Daltons) are known.

US Pat. No. 4,956,122 discloses poly alpha.
A lubricating oil composition is described which comprises olefins (PAO), synthetic hydrocarbons, esters of carboxylic acids and optionally further additives. This mixture has good shear stability, good oxidative stability and good viscosity-temperature behavior and can be used as compounded gear oil, motor oil and hydraulic oil. German Patent (DE-A) 40th
No. 25494 contains 4 to 3 in the molecule in addition to the usual components.
20-75% by weight of at least one 1-alkene having 2 carbon atoms, an alkyl (meth) acrylate having an unbranched and / or branched chain alkyl group or a cycloalkyl group having 4 to 32 carbon atoms 20 ˜100% by weight and (meth) acrylic acid ester having a hydroxyl group-containing or ether group-containing ester group 0-65% by weight
Synthetic oils containing 5 to 100% by weight of cooligomers composed of The process for producing these cooligomers is described in German Patent (DE-A) 4025493.

[0008]

As has been extended in the above state of the art, (meth) acrylate / α-olefin oligomers are preferably used as mineral oil additives, heretofore known as "synthetic oils". There was no physical relevance. State-of-the-art synthetic oils are usually composed of hydrocarbons and / or esters such as oligomers of 1-decene, for example dicarboxylic acid esters (for example "Ullmanns Enc").
yclopadie der Tochnische
n Chemie ", 4th edition, volume 20, page 503-
See page 530, Chemie Publishing, 1981).

However, both material classes mentioned above have drawbacks. Due to its non-polar structure, polyolefin has a cleaning component (DI-Pake) containing a polar component such as a metal.
te) packaging, extreme pressure additive (ED-Additione)
And shows too little solubility when used with antiwear additives (AW additives).

Owing to their polar structure, esters have, as is well known, significant drawbacks, such as poor miscibility with mineral and non-mineral oil based non-polar base oils and poor packing compatibility. Furthermore, the ester functional groups are susceptible to hydrolysis, with the possible result of promoting corrosion of metal parts. Previous attempts to compensate for the above drawbacks by admixing hydrocarbons and esters have always been associated with considerable development costs.

German Patent (DE-A) No. 402549
The cooligomers described in No. 4 are comparable with state-of-the-art synthetic oil components in terms of viscosity, VI index, low temperature properties, evaporation and oxidative stability and other practically important properties.
However, in comparison with the above-mentioned state of the art, the cooligomer has the following advantages. Based on a combination of polar and non-polar monomers, mineral oil, poly alpha-olefin (PAO),
There is no problem of miscibility with esters and other base solutions and compatibility with additives. Synthetic oil blends of the above-described cooligomers with, for example, polyolefins and / or esters have a significantly increased VI index relative to the individual components and a significantly lower low temperature viscosity than is possible with, for example, synthetic hydrocarbons. Have. This results in characterization data for various mineral oil specifications being achievable with or without a small proportion of polymeric VI modifier, which results in advantages in shear stability. Moreover, the risk of deposit formation is reduced.

By the way, German Patent (DE-A) No. 4
The co-oligomers generally described in 0254945 are comonomer components A): 1-alkenes having 8 to 14 carbon atoms in the molecule and B) 4 to 4 in the ester groups.
Admixture with a conventional synthetic oil component for a specified proportion of (meth) acrylic acid ester having 22 carbon atoms, in addition to the advantages described in German Patent (DE-A) 4025494, mixed synthetic oils. Was shear stable to the extent that it had a strict Newtonian viscous property in the temperature range of 20 to 200 ° C. with a shear gradient of 10 ⁷ s to ¹ .

[0013]

In addition to the usual constituents, the invention also comprises: A) 5-50% by weight of at least one 1-alkene having 8 to 14 carbon atoms in the molecule and B). Formula I:

[0014]

[Chemical 4]

[Wherein R ₁ represents hydrogen or methyl,
R ₂ has 4 to 22 carbon atoms in the ester group,
Optionally represents a branched chain alkyl group or a cycloalkyl group], a synthetic oil containing 5 to 40 parts by weight of a co-oligomer CM composed of 50 to 95% by weight of at least one (meth) acrylic acid ester Regarding

This synthetic oil has a strict Newtonian viscosity characteristic in the temperature range of 20 to 200 ° C. and a shear gradient of 10 ⁷ s to ¹ , that is, a viscosity of 10 to 10 ⁷ s ~.
It is constant at shear gradients between ¹ . In some cases
The cooligomer CM is in the proportion of 0 to 50% by weight and has the formula II:

[0017]

[Chemical 5]

[Wherein R ₃ represents hydrogen or methyl,
R ₄ is substituted with at least one hydroxyl group,
Represents an alkyl group having 2 to 6 carbon atoms or has the formula I
II:

[0019]

[Chemical 6]

Wherein R ₅ and R ₆ represent hydrogen or methyl, R ₇ represents hydrogen or, optionally, a branched alkyl group having 1 to 40 carbon atoms, in particular 1 to 20 carbon atoms, n represents an integer of 1 to 60, where n is 1
R ₇ is at the same time optionally exclusively branched,
Another group of (meth) acrylic acid ester represented by the formula (1) represents a group represented by C1-40 alkyl group)).

Cooligomer CM The average molecular weight Mw (weight average) of the cooligomer CM according to the invention is from 10 ^{3 to} 5 × 10 ⁴ Daltons, especially 1.5 ×.
In the molecular weight range between 10 ^{3 and} 2.5 × 10 ⁴ Daltons (Mw determination by gel permeation chromatography,
H. F. Mark et al., “Encyclopedia o
f Polymer Science and Tech
"Nology", Volume 10, pp. 1-19, J. Wil
et al., 1987). The total of components A), B) and optionally C) in the cooligomer CM is 100% by weight
Should be.

Examples of representatives of component A) include, for example: octene-1, nonane-1, decene-
1, dodecene-1, tridecene-1, tetradecene-
1, or branched chain alkenes such as vinylcyclohexane, 3,3-trimethyl-pentene-1, 4,4,5,5-tetramethyl-hexene-1 and the like. More ethylene,
Also suitable are 1-alkenes having 10 to 14 carbon atoms, which are formed during the polymerization of propylene or mixtures thereof, the educts themselves being produced from hydrocracking materials.

Embodiments in which the component A) of the cooligomer CM represents 1-decene, 1-dodecene or 1-tetradecene are particularly preferred. Particularly desirable is 1-decene, and when it is used, the best low temperature characteristics (pour point) can be confirmed. Component B) may, for example, consist of the following monomers: butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, hexyl acrylate, heptyl acrylate, octyl acrylate, nonyl acrylate, decyl acrylate,
Isodecyl acrylate, undecyl acrylate, dodecyl acrylate, tridecyl acrylate, tetradecyl acrylate, pentadecyl acrylate, hexadecyl acrylate, heptadecyl acrylate, octadecyl acrylate, oleyl acrylate, nonadecyl acrylate, eicosyl acrylate or corresponding methacrylate, alkyl Alkyl methacrylates with a high isomer content having 10 to 22 carbon atoms in the radical are prominent. For example, isomer content of about 6
C ₁₂ -C ₁₅ -Alkyl esters of methacrylic acid with 0 to 90% are mentioned, the high degree of branching having a favorable effect on the low temperature properties of cooligomers CM containing pour points and the determination of the number of carbon atoms. Distribution improves viscosity and temperature behavior. Examples of representatives of component C) optionally contained in cooligomers CM are those which have one OH group in the alkyl radical, in particular the OH group in the ω-position of the alkyl radical, for example 2
-Hydroxyethyl methacrylate and acrylate, 3-hydroxypropyl methacrylate and -acrylate, as well as 2-hydroxypropyl methacrylate and -acrylate, 2- and 3-hydroxypropyl methacrylate and -acrylate or a mixture of 4-hydroxybutyl methacrylate and -acrylate. Can be mentioned.

Further representatives of component C) in which R ₄ represents a radical having several alkoxy-, especially ethoxy substituents, are, for example, 2- (2-ethoxyethoxy) ethyl-methacrylate and -acrylate, or on average. (Meth) acrylic acid esters of alcohols from ethoxylated C ₁ -C ₁₈ fatty alcohol mixtures having a degree of ethoxylation of ₁ to 60, such as an average degree of ethoxylation of 11 to 25, such as Carbowax® and Marlipal. Methacrylates from corresponding industrial products of the registered trademark type, eg Carbowax 550, Maripal 1618/1
1, Maripal 1618/25, Maripal 013/20
0, Carbowax 2000 and Carbowax 75
0 methacrylic acid esters are used.

The co-oligomers CM can be prepared by radical-induced polymerization, for example by thermal polymerization, or by addition of suitable initiators or redox systems under certain prerequisites. The polymerization can be carried out in the absence as well as the presence of a suitable solvent. Accordingly, all conventional solvents which have been proven as polymerization media, as well as mineral oils, poly-α-
Olefins (PAO), ester oils or already produced oligomers can be used. In that case, for example, 1-alkene (component A)) can be charged into a suitable reaction vessel and brought to a suitable reaction temperature. In general,
A temperature range of 80 to 200 ° C., in particular 120 to 180 ° C., can be used as an advantageous range. To this is added component B) or optionally component B) + C) in the proportions specified therein, within the same temperature range, over a specific period of time, for example 0.25 to 10 hours. Advantageously, the complete polymerization is carried out in a batch for a few hours (6 hours as a rule). A polymerization initiator, for example about 30
It has proved to be advantageous to add in small amounts or continuously by the inflow method at minute intervals. Examples of the initiator include radical initiators known per se (for this, K
irk-Othmer, "Encyclopedia
of Chemical Technology ", Third Edition, Volume 12, Pages 355-373, J. Wil.
ey, 1981). The total amount of initiator used is usually
It is in the range of 0.1 to 10% by weight, preferably in the range of 0.1 to 5% by weight, based on the total amount of the monomers. Advantageously, an initiator is chosen whose decomposition properties are compatible with the type of polymerisation. Approximate values include a half-life of the initiator (in benzol) at reaction temperature of about 0.25 hours. This includes peroxide-based initiators such as di-t-butyl peroxide. As a guide, when added in a small amount, 10 to ^{3 to} 5 × 10 to ³ mol of the initiator is added once. As a result, sufficient reaction of the monomers (eg, 98%) occurs so that separation of the monomers is often unnecessary. For example, if flash point requirements are high, residual monomer must be removed. Oligomer CM is generally a colorless oily liquid, such as mineral oil, PAO.
And thoroughly mixed with the ester oil.

Other Components of Synthetic Oils Other examples of synthetic oils according to the present invention include, for example, Kirk-Othmer, Encyclopedia of Chemical Technology (Encyclo).
Pedia of Chemical Technology
No.), "3rd edition, vol. 14, p. 496-501.
Pp. (J. Wiley, 1981).

Industrially desirable are in particular poly α-olefins (PAO) as well as organic esters such as polyol esters of dicarboxylic acids (EI Wil).
Llamson, “J. Synth. Lubr.”, Volume 2 (4), Pages 329-341; Volume 3 (1), Pages 45-53 (1987); Plugge,
"Tribologie und Schmierun
gstechnik ", Vol. 34, pp. 148-15
6 (1987); "Ullmann", 4th edition, Volume 20, (supra), pp. 514-821).

The starting materials for PAO are primarily three
It is a decomposed olefin having a boiling point of 0 to 300 ° C. P
AO usually has an average molecular weight of usually 3 × 10 ^{2 to} 6 × 10 ³ daltons and has the general formula IV:

[0029]

[Chemical 7]

[Wherein R particularly represents an alkyl group having 6 to 10 carbon atoms]. As the organic ester (OE), on the one hand, a dicarboxylic acid having 3 to 17 carbon atoms,
Mention may be made, for example, of esters of adipic acid, azelaic acid or cepacic acid with primary alcohols (the most important alcohol component in this case being polyalkylene glycols), while monocarboxylic acid esters, in particular C ₆ -C ₂₂ - especially branched chain alcohols and carboxylic acids, in particular neopentyl alcohol, esters of as having a neopentyl basic structure, such as trimethylolpropane or pentaerythritol and the like.

OE oils have a high adsorption capacity for metal surfaces and thus a good lubricity, but are relatively unstable to decomposition (by hydrolysis) and may form corrosive decomposition products. is there. OE used as a synthetic oil component
Is typically ² to 500 mm ² s to ¹ at 100 ° C., especially ² to 20 mm ² s to ¹ kinematic viscosity (Kinematische Vi
skositaeten).

Advantageous Effects of the Invention The cooligomers according to the invention are based on the combination of polar and non-polar monomers and are superior to mineral oils, poly alpha-olefins (PAO), organic esters (OE) or other dispersions. It has good miscibility, and good compatibility (miscibility) with other oil additives. The sealing properties are absolutely neutral. Elastomers such as fluoro-, acrylate or nitrile-butadiene rubbers do not corrode. Corrosion due to acid formation can likewise be eliminated in the case of (meth) acrylic acid ester comonomers. The miscibility of cooligomers CM with synthetic oils such as PAO and / or OE has a distinctly higher VI index compared to the individual components, which can be attributed to the effects of cooligomers. Furthermore, the cooligomer component causes a significantly lower low temperature viscosity than is possible, for example, with synthetic hydrocarbons. The behavior under strong thermo-oxidative loading is excellent despite the partially present residual double bonds. The mixture containing cooligomers has good demulsification behavior even after strong thermooxidative loading. The air separation capacity of the above mixture is clearly superior to that of the pure (meth) acrylic acid alkyl ester.

A co-oligomer CM having a further comonomer component C) according to claim 2 has a good dispersing action, for example on black slurries, whereby oxygen-containing dispersible groups are present.

[0034]

[Chemical 8]

On the basis of the above, sealing problems are avoided and there is no loss of shear stability of the admixture, as is the case, for example, when using polymeric VI modifiers. As a result, it follows that characteristic data for various mineral oil grades can be achieved with or without apparently small amounts of polymeric VI modifiers.

Surprisingly, the cooligomer CM according to the invention
Synthetic oil containing is 1 within the temperature range of 20 to 200 ° C.
It has a strict Newtonian viscous behavior in shear gradients from 0 ⁷ s to ¹ . The VI index of the admixture is very high, preferably 150 or higher (calculated from a kinematic viscosity of 40 and 100 ° C.), particularly preferably 180 or higher. Therefore,
The synthetic oils according to the invention are used as: * High-loading multi-range motor oil * Gear with clearly good shear stability, good demulsification behavior, good behavior and good air separation capacity Oil * Hydraulic oil with good power transmission (= slight compressibility), neutral sealing behavior, extremely low corrosivity and large temperature range of use The following examples serve to illustrate the invention.

Physical data have been confirmed for the following standards (see for example Kirk-Othmer, supra, Vol. 14, pp. 477-526): Kinematic viscosity: DIN 51562 or ASTM D44.
5 by Ubbelohde viscometer VI index: calculated from kinematic viscosity of base oil at 40 ° C. and 100 ° C. according to ASTM D2270 Pour point: DIN 51583; average molecular weight Mw according to ASTM D97: Bromine by gel permeation chromatography (using PMMA as standard) Price: according to DIN 51774 Noack Price: according to DIN 51584

[0038]

【Example】

Example 1 Preparation of cooligomer CM 200 g of 1-decene are heated to 140 ° C. in a reaction vessel. 400 g of isodecyl methacrylate and C ₁₂ -C
_15- alkylmethacrylate (isomer content 60%) 40
A mixture of 0 g is run in for 5 hours. Polymerization is complete in batches for 6 hours after the end of the inflow. During the total reaction time of 11 hours (except the last hour) the initiator is added in the form of a second inflow (here eg t-butylperbenzoate, total amount, 2.2% by weight, based on monomers). To do.
After the reaction is complete, the conversion of monomer is about 98%.

The product is a colorless oily liquid, miscible with mineral oils, polyolefins or ester oils: Mw =
2.5 × 10 ⁴ Dalton, U = 3.74, Pour Point ASTM D
97: -18 ° C. Noack number: <5% by weight Example 2 Viscosity behavior of Newton of cooligomer CM in organic ester (= synthetic oil) Dynamic viscosity (dynamische Viscosita)
t) η can be measured up to a content of 35% by weight of co-oligomer CM in ester oil (trimethyladipate octyldecyl ester), independently of the shear gradient as shown in FIG. 1 (DIN 51382 or ASTM D
3945).

Example 3 Low Temperature Behavior of Cooligomers CM in Ester Oils The low temperature behavior of synthetic oils according to the invention was determined according to ASTM D260.
2 "Cold Cranking Simulator (Co
ld-Crankind-Simulator) ", ester oil and poly alpha-olefin (PAO 1
00: 1-decene oligomer having a kinematic viscosity of about 100 mm ² s ~ ¹ ). At the same kinematic viscosity ν at 100 ° C, the synthetic oil of the present invention has a temperature of -25 ° C.
Dynamic viscosity η at about 45% lower than the comparable synthetic oil consisting of ester oil and PAO 100 (FIG. 2).

Example 4 Use of Synthetic Oil as Motor Oil Cooligomer C as Synthetic Oil Component for Motor Oil
150 ° C. and shear rate to determine the suitability of M

[0042]

[Outer 1]

VW specifications (VW Spezify
kation) VW Tl 505.00 HT / HS
The various SAE classes are adjusted taking into account (High Temperature / High Shear-Value) ≧ 3.5, the advantages of the Newtonian viscous behavior being fully maintained. Table 1 shows a property summary and comparison with commercial products:

[0044]

[Table 1]

Example 5 Use of Synthetic Oils According to the Invention as Hydraulic Oils Due to the high viscosity of the cooligomers CM, the highest ISO VG class can be adjusted without problems for synthetic oils according to the invention. Even high viscosity formulations have good low temperature viscosity properties. Table 2 shows the properties of the formulations with cooligomer CM: Table 2: ISO-VG Ester oils Kinematic viscosity (mm ² s ~ ¹ ) flow in the content of parts (wt%) in the following temperatures: Point 100 ℃ 40 ℃ 0 ℃ -20 ℃ VI [℃] ISO 22 8 5.30 21.7 640 193 -66 ISO 46 22 9.96 47.4 1,755 204 -63 ISO 100 35 17.86 99.4 4,750 199 -57 ISO 150 42 24.60 152.9 8,900 194 -54 ISO 220 48 32.50 221.1 14,800 192 -51 ISO 320 55 45.20 344.3 3,260 190 -48 ISO 460 60 56.75 471.4 6,730 189 -51 ISO 680 65 72.64 660.0 10,790 189 -45 ISO 1000 71 94.00 945.0 16,181 189 -39 ISO 1500 76 127.80 1460.0 25,134 190 -36

[Brief description of drawings]

1 is a dynamic viscosity η / co-oligomer content diagram at 150 ° C. showing the Newtonian behavior of cooligomers CM in synthetic oils.

FIG. 2 is a dynamic viscosity η at −25 ° C./kinetic viscosity ν diagram at 100 ° C. showing a low temperature behavior of cooligomers CM in synthetic oil.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display area C10N 40:08

Claims (3)

[Claims] 1. In addition to the components customary per se, it contains 5 to 50 parts by weight of a co-oligomer CM consisting of alkyl (meth) acrylate and 1-alkene, the co-oligomer CM being 8 to 14 in the molecule A). 5-50% by weight of at least one 1-alkene having carbon atoms of and B) Formula I: At least R ₁ represents hydrogen or methyl, R ₂ represents an optionally branched alkyl or cycloalkyl group having 4 to 22 carbon atoms in the ester group, Seed (meth) acrylic acid ester
In a synthetic oil composed of 50 to 95% by weight,
Within the temperature range of 20 to 200 ° C., the synthetic oil is 10 to 10
A synthetic oil having a Newtonian viscous behavior in a shear gradient of ⁷ s- ¹ . 2. A co-oligomer CM comprises, in addition to the monomer components A) and B), a C) formula II: [Wherein R ₃ represents hydrogen or methyl, and R ₄ is substituted with at least one hydroxyl group and has 2 to 2 carbon atoms.
6 represents an alkyl group or has formula III: (In the formula, R ₅ and R ₆ represent hydrogen or methyl, and R ₇
Represents hydrogen or, optionally, a branched, alkyl group having 1 to 40 carbon atoms, n represents an integer of 1 to 60, provided that when n is 1, R ₇ is exclusively occupied at the same time. A (meth) acrylic acid ester of a branched chain, which represents an alkyl group having 1 to 40 carbon atoms) or
However, the total amount of the monomers A), B) and C) in the cooligomer CM is 100% by weight, the synthetic oil having a high dispersive effect according to claim 1. 3. The synthetic oil according to claim 1, which is used as a motor oil, a gear oil and a hydraulic oil.