[0001]The present invention relates to a lubricating oil composition comprising an ethylene•α-olefin copolymer and a 10 method for manufacturing thereof.
Background Art [0002]
Oil products have temperature dependency of viscosity,
15 which is a characteristic that viscosity largely changes when temperature changes. For example, the temperature dependency of viscosity is preferably small. For the purpose of lessening the temperature dependency of viscosity, a certain polymer that is soluble in a lubricating oil base is used in a lubricating
20 oil as a viscosity-modifying agent. In recent years, α-olefin copolymers are widely used as such viscosity-modifying agents, and various improvements have been performed in order to further improve the balance of characteristics of lubricating oils (as exemplified in Patent Literature 1).

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The viscosity index-improving agents described above are
generally used for keeping proper viscosity upon high
temperatures. However, in recent years, viscosity-modifying
agents that suppress viscosity increase upon especially low
5 temperatures (that have excellent low-temperature property)
and that have excellent durability and thermal and oxidation stability are demanded in the situation that energy conservation and resources saving are strongly intended as part of reducing loads for environments. In general applications of
10 lubricating oils, in order to obtain an excellent low-
temperature property, a method for using polymers having molecular weights as high as possible is known because suppressing polymer concentration as low as possible is advantageous, and because it is also advantageous in terms of
15 economic aspects. On the other hand, there is a problem that
the higher the molecular weight is, the worse the shear stability is. In the application of an industrial lubricating oil, especially an oil for gears for wind power generation, higher low-temperature property and shear stability are
20 demanded, and the quality considering the balance of both
characteristics is required.
Citation List
Patent Literature

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[0003]
Patent Literature 1: WO 00/34420 A1
Summary of Invention
5 Technical Problem
[0004]
In lubricating oil bases, mineral oils are classified in three classes of the Groups (I) to (III) by API quality classification, and further poly•α-olefin (PAO) is classified
10 in the Group (IV), and others are classified in the Group (V).
In various applications of lubricating oils for automobiles, in order to cope with advancement of required characteristics and reduction of environmental loads, the use is shifting from the mineral oils of Group (I), which is conventionally and
15 widely used, to mineral oils of Groups (II) and (III) or
synthetic oils such as poly•α-olefin, and the used ratio of the latter is becoming higher. On the other hand, longer duration of use and high durability are also required in the application of an industrial lubricating oil, and the mineral
20 oils of Group (III) or poly•α-olefin as described above is used.
Especially, in the recent oil for gears for wind power generation, shearing stability is strongly required as the main parameter of durability. It is difficult to adjust the shearing stability required here by viscosity adjusting agents of the

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conventional high molecular weight-type, so α-olefin polymers having relatively lower molecular weights such as polybutene are used. However, depending on applications, there has been room for improving viscosity characteristics, especially 5 adequate fluidity in low temperatures of polybutene. Also, in the oil for gears for wind power generation, in addition to conventionally required characteristics, a high micro-pitching prevention property is required. Micro-pitching is a fatigue process caused just before gear damage by excess stress cycles
10 in the area of rolling elastohydrodynamic lubrication (EHL) under a high load. In such a situation, the present inventors have intensively studied and have found that the problems described above are solved by combining an ethylene•α-olefin copolymer having a certain range of ethylene content, viscosity,
15 and molecular weight distribution and one or more synthetic oils and/or mineral oils having a certain viscosity, viscosity index and pour point with a base, and have accomplished the present invention. [0005]
20 The object to be achieved by the present invention is to
provide an industrial lubricating oil having excellent balance of low-temperature viscosity properties and shear stability, and having high thermal and oxidation stability and high micro-pitching prevention performance.

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Solution to Problem [0006]
The specific embodiments of the present invention include 5 the following aspects:
[1] A lubricating oil composition containing 30 to 90% by weight of a liquid random copolymer (A) of ethylene and α-olefin, the liquid random copolymer (A) being prepared by the below method (α), and 10 to 70% by weight of a lubricating oil 10 base consisting of one or more components selected from a synthetic oil (B) having the properties of (B1) to (B3) or a mineral oil (C) having the properties of (C1) to (C3) (note that the sum total of the components (A), (B) and (C) is 100% by weight) 15 (B1) The synthetic oil has a kinematic viscosity at 100°C of 2 to 20 mm2/s
(B2) The synthetic oil has a viscosity index of 130 or more (B3) The synthetic oil has a pour point of -30°C or lower (C1) The mineral oil has a kinematic viscosity at 100°C of 2 20 to 10 mm2/s
(C2) The mineral oil has a viscosity index of 120 or more (C3) The mineral oil has a pour point of -10°C or lower (Method (α))
a method (α) for preparing a liquid random copolymer of

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ethylene and α-olefin,
comprising a step of carrying out solution polymerization of ethylene and α-olefin having 3 to 20 carbon atoms, under a catalyst system containing 5 (a) a bridged metallocene compound represented by the following Formula 1 and
(b) at least one compound selected from a group consisting of (i) an organoaluminum oxy-compound, and
(ii) a compound which reacts with the bridged metallocene 10 compound to form ion pairs. [0007] [Chem. 1]

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Ry Rtt ... (Formula 1)
[In Formula 1, R1, R2, R3, R4, R5, R8, R9 and R12 are
respectively and independently hydrogen atom, hydrocarbon
group or silicon-containing hydrocarbon group, and adjoining
5 groups are optionally connected to each other to form a ring
structure,
R6 and R11, being the same, are hydrogen atom, hydrocarbon group or silicon-containing hydrocarbon group,
R7 and R10, being the same, are hydrogen atom, hydrocarbon 10 group or silicon-containing hydrocarbon group,

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R6 and R7 are optionally connected to hydrocarbon having 2 to 3 carbon atoms to form a ring structure,
R11 and R10 are optionally connected to hydrocarbon having
2 to 3 carbon atoms to form a ring structure,
5 R6, R7, R10 and R11 are not hydrogen atom at the same time;
Y is a carbon atom or silicon atom;
R13 and R14 are independently aryl groups;
M is Ti, Zr or Hf;
Q is independently halogen, hydrocarbon group, an anionic
10 ligand or a neutral ligand which can be coordinated to a lone
pair of electrons; and
j is an integer of 1 to 4.]
[2] The lubricating oil composition of the aforementioned
[1], wherein in the metallocene compound represented by the
15 above Formula 1, at least one among substituents (R1, R2, R3
and R4) bonded to cyclopentadienyl group is a hydrocarbon group having 4 or more carbon atoms.
[3] The lubricating oil composition of the aforementioned [1]
or [2], wherein R6 and R11, being the same, are hydrocarbon
20 groups having 1 to 20 carbon atoms.
[4] The lubricating oil composition according to any of the aforementioned [1] to [3], wherein in the metallocene compound represented by Formula 1, the substituent (R2 or R3) bonded to the 3-position of the cyclopentadienyl group is a hydrocarbon

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group.
[5] The lubricating oil composition of the aforementioned
[4], wherein in the metallocene compound represented by Formula 1, the hydrocarbon group (R2 or R3) bonded to the 3-position of 5 the cyclopentadienyl group is an n-butyl group.
[6] The lubricating oil composition according to any of the aforementioned [1] to [5], wherein in the metallocene compound represented by Formula 1, substituents (R6 and R11) bonded to the 2-position and 7-position of the fluorenyl group are all 10 tert-butyl groups.
[7] The lubricating oil composition according to any of the aforementioned [1] to [6], wherein the compound which reacts with the bridged metallocene compound to form ion pairs is a compound represented by the following Formula 6: 15 [0008]
[Chem. 2]
+e Rf—B
R9 -Rh
R'
[In Formula 6, Re+ is
* " • (Formula 6)
H+, a carbenium cation, an oxonium

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cation, an ammonium cation, a phosphonium cation, a cycloheptyltrienyl cation, or a ferrocenium cation having a transition metal, and Rf to Ri each is independently a hydrocarbon group having 1 to 20 carbon atoms.] 5 [8] The lubricating oil composition according to the aforementioned [7], wherein the ammonium cation is a dimethylanilinium cation.
[9] The lubricating oil composition according to the aforementioned [7] or [8], wherein the catalyst system further
10 comprises an organoaluminum compound selected from a group consisting of trimethyl aluminum and triisobutyl aluminum. [10] The lubricating oil composition according to any of the aforementioned [1] to [9], wherein the copolymer (A) is a copolymer consisting of ethylene and α-olefin having 3 to 10
15 carbon atoms.
[11] The lubricating oil composition according to any of the aforementioned [1] to [10], wherein the synthetic oil (B) is a lubricating oil base selected from a poly•α-olefin (PAO) or an ester oil.
20 [12] The lubricating oil composition according to any of the aforementioned [1] to [11], wherein the lubricating oil composition further contains a pour point lowering agent. [13] The lubricating oil composition according to any of the aforementioned [1] to [12], wherein the viscosity of the

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lubricating oil composition at 40°C is in the range of 190 to 750 mm2/s.
[14] A lubricating oil composition containing from 30 to 90% by weight of a liquid random copolymer of ethylene and α-olefin 5 having the properties of (A1) to (A5) below, and from 10 to 70% by weight of a lubricating oil base consisting of one or more components selected from a synthetic oil (B) having the properties of (B1) to (B3) or a mineral oil (C) having the properties of (C1) to (C3) (note that the sum total of the 10 components (A), (B) and (C) is 100% by weight):
(A1) The liquid random copolymer contains 40 to 60 mol% of the ethylene unit and 60 to 40 mol% of an α-olefin unit having 3 to 20 carbon atoms
(A2) The liquid random copolymer has the number average
15 molecular weight (Mn) of 500 to 10,000 and the molecular weight
distribution of 3 or less (note that Mw/Mn and Mw are the
weight average of the molecular weight) measured by gel
permeation chromatography (GPC)
(A3) The liquid random copolymer has 100°C kinetic viscosity 20 of 30 to 5,000 mm2/s
(A4) The copolymer has a pour point of 30 to -45°C
(A5) The copolymer has the bromine number of 0.1g/100g or less
(B1) The synthetic oil has a kinematic viscosity at 100°C of 2 to 20 mm2/s

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(B2) The synthetic oil has a viscosity index of 130 or more (B3) The synthetic oil has a pour point of -30°C or lower (C1) The mineral oil has a kinematic viscosity at 100°C of 2 to 10 mm2/s 5 (C2) The mineral oil has a viscosity index of 120 or more (C3) The mineral oil has a pour point of -10°C or lower [15] The lubricating oil composition for industrial use according to any of the aforementioned [1] to [14], wherein the lubricating oil composition is an oil composition for gears
10 for wind power generation.
[16] A method for producing a lubricating oil composition comprising the steps of
preparing a liquid random copolymer (A) of ethylene and α-olefin by the method (α) below, and
15 mixing 30 to 90% by weight of the liquid random copolymer
(A), and from 10 to 70% by weight of a lubricating oil base consisting of one or more components selected from a synthetic oil (B) having the properties of (B1) to (B3) or a mineral oil (C) having the properties of (C1) to (C3) (note that the sum
20 total of the components (A), (B) and (C) is 100 parts by weight) (B1) The synthetic oil has a kinematic viscosity at 100°C of 2 to 20 mm2/s
(B2) The synthetic oil has a viscosity index of 130 or more (B3) The synthetic oil has a pour point of -30°C or lower

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(C1) The mineral oil has a kinematic viscosity at 100°C of 2 to 10 mm2/s
(C2) The mineral oil has a viscosity index of 120 or more (C3) The mineral oil has a pour point of -10°C or lower 5 (Method (α))
a method (α) for preparing a liquid random copolymer of ethylene and α-olefin,
comprising a step of carrying out solution polymerization of ethylene and α-olefin having 3 to 20 carbon atoms, under a 10 catalyst system containing
(a) a bridged metallocene compound represented by the following Formula 1 and
(b) at least one compound selected from a group consisting of
(i) an organoaluminum oxy-compound, and
15 (ii) a compound which reacts with the bridged metallocene
compound to form ion pairs. [0009] [Chem. 3]

SF-3422

14


,(Formula 1)

[In Formula 1, R1, R2, R3, R4, R5, R8, R9 and R12 are

respectively

and

independently

hydrogen

atom,

hydrocarbon

group or silicon-containing hydrocarbon group, and adjoining
5 groups are optionally connected to each other to form a ring
structure,
R6 and R11, being the same, are hydrogen atom, hydrocarbon group or silicon-containing hydrocarbon group,
R7 and R10, being the same, are hydrogen atom, hydrocarbon
10 group or silicon-containing hydrocarbon group,

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15
R6 and R7 are optionally connected to hydrocarbon having 2 to 3 carbon atoms to form a ring structure,
R11 and R10 are optionally connected to hydrocarbon having
2 to 3 carbon atoms to form a ring structure,
5 R6, R7, R10 and R11 are not hydrogen atom at the same time;
Y is a carbon atom or silicon atom;
R13 and R14 are independently aryl groups;
M is Ti, Zr or Hf;
Q is independently halogen, hydrocarbon group, an anionic
10 ligand or a neutral ligand which can be coordinated to a lone
pair of electrons; and
j is an integer of 1 to 4.]
Advantageous Effects of Invention
15 [0010]
Because of excellent low-temperature viscosity properties and shear stability, and further thermal and oxidation stability, the lubricating oil composition of the present invention is excellent for such as energy conservation
20 and resources saving, and it is suitably effective as an
industrial lubricating oil, especially a lubricating oil for wind power generation.
Description of Embodiments

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[0011]
Liquid Random Copolymer (A)
The liquid random copolymer (A) of ethylene and α-olefin in the present invention (that is also described herein as 5 “ethylene•α-olefin copolymer (A)”) is prepared by the method (α) below: (Method (α))
a method (α) for preparing a liquid random copolymer of ethylene and α-olefin, 10 comprising a step of carrying out solution polymerization of ethylene and α-olefin having 3 to 20 carbon atoms, under a catalyst system containing
(a) a bridged metallocene compound represented by the following Formula 1 and 15 (b) at least one compound selected from a group consisting of (i) an organoaluminum oxy-compound, and
(ii) a compound which reacts with the bridged metallocene compound to form ion pairs. [0012] 20 [Chem. 4]

SF-3422

17


-(Formula 1)
[In Formula 1, R1, R2, R3, R4, R5, R8, R9 and R12 are
respectively and independently hydrogen atom, hydrocarbon
group or silicon-containing hydrocarbon group, and adjoining
5 groups are optionally connected to each other to form a ring
structure,
R6 and R11, being the same, are hydrogen atom, hydrocarbon group or silicon-containing hydrocarbon group,
R7 and R10, being the same, are hydrogen atom, hydrocarbon
10 group or silicon-containing hydrocarbon group,

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R6 and R7 are optionally connected to hydrocarbon having 2 to 3 carbon atoms to form a ring structure,
R11 and R10 are optionally connected to hydrocarbon having
2 to 3 carbon atoms to form a ring structure,
5 R6, R7, R10 and R11 are not hydrogen atom at the same time;
Y is a carbon atom or silicon atom;
R13 and R14 are independently aryl groups;
M is Ti, Zr or Hf;
Q is independently halogen, hydrocarbon group, an anionic
10 ligand or a neutral ligand which can be coordinated to a lone
pair of electrons; and
j is an integer of 1 to 4.]
Here, the hydrocarbon group has 1 to 20 carbon atoms,
preferably 1 to 15 atoms, and more preferably 4 to 10 carbon
15 atoms, and means for example an alkyl group, aryl group etc.
The aryl group has 6 to 20 carbon atoms, and preferably 6 to 15 carbon atoms. [0013]
Examples of the silicon-containing hydrocarbon group
20 include an alkyl or aryl group having 3 to 20 carbon atoms
which contains 1 to 4 silicon atoms, and in more detail includes trimethylsilyl group, tert-butyldimethylsilyl group, triphenylsilyl group etc. [0014]

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19
In the bridged metallocene compound represented by
Formula 1, cyclopentadienyl group may be substituted or
unsubstituted.
[0015]
5 In the bridged metallocene compound represented by
Formula 1,
(i) it is preferable that at least one among substituents
(R1, R2, R3 and R4) bonded to cyclopentadienyl group is a
hydrocarbon group,
10 (ii) it is more preferable that at least one among
substituents (R1, R2, R3 and R4) is a hydrocarbon group having 4 or more carbon atoms,
(iii) it is most preferable that substituent (R2 or R3)
bonded to the 3-position of the cyclopentadienyl group is a
15 hydrocarbon group having 4 or more carbon atoms (for example
an n-butyl group). [0016]
In case where at least two among R1, R2, R3 and R4 are
substituents (that is, being not hydrogen atom), the above-
20 mentioned substituents may be the same or be different, and it
is preferable that at least one substituent is a hydrocarbon
group having 4 or more carbon atoms.
[0017]
In the metallocene compound represented by Formula 1, R6

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20
and R11 bonded to fluorenyl group are the same, R7 and R10 are
the same, but R6, R7, R10 and R11 are not hydrogen atom at the
same time. In high-temperature solution polymerization of poly-
α-olefin, in order to improve the polymerization activity,
5 preferably neither R6 nor R11 is hydrogen atom, and more
preferably none of R6, R7, R10 and R11 is hydrogen atom. For
example, R6 and R11 bonded to the 2-position and 7-position of
the fluorenyl group are the same hydrocarbon group having 1 to
20 carbon atoms, and preferably all tert-butyl groups, and R7
10 and R10 are the same hydrocarbon group having 1 to 20 carbon
atoms, and preferably all tert-butyl groups. [0018]
The main chain part (bonding part, Y) connecting the
cyclopentadienyl group and the fluorenyl group is a cross-
15 linking section of two covalent bonds comprising one carbon
atom or silicon atom, as a structural bridge section imparting
steric rigidity to the bridged metallocene compound represented
by Formula 1. Cross-linking atom (Y) in the cross-linking
section has two aryl groups (R13 and R14) which may be the same
20 or different. Therefore, the cyclopentadienyl group and the
fluorenyl group are bonded by the covalent bond cross-linking
section containing an aryl group. Examples of the aryl group
include a phenyl group, naphthyl group, anthracenyl group, and
a substituted aryl group (which is formed by substituting one

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21
or more aromatic hydrogen (sp2-type hydrogen) of a phenyl group, naphthyl group or anthracenyl group, with substituents). Examples of substituents in the aryl group include a hydrocarbon group having 1 to 20 carbon atoms, a silicon-5 containing hydrocarbon group having 1 to 20 carbon atoms, a halogen atom etc., and preferably include a phenyl group. In the bridged metallocene compound represented by Formula 1, preferably R13 and R14 are the same in view of easy production. [0019]
10 In the bridged metallocene compound represented by
Formula 1, Q is preferably a halogen atom or hydrocarbon group having 1 to 10 carbon atoms. The halogen atom includes fluorine, chlorine, bromine or iodine. The hydrocarbon group having 1 to 10 carbon atoms includes methyl, ethyl, n-propyl, isopropyl,
15 2-methylpropyl, 1,1-dimethylpropyl, 2,2-dimethylpropyl, 1,1-diethylpropyl, 1-ethyl-1-methylpropyl, 1,1,2,2-tetramethylpropyl, sec-butyl, tert-butyl, 1,1-dimethylbutyl, 1,1,3-trimethylbutyl, neopentyl, cyclohexyl methyl, cyclohexyl, 1-methyl-1-cyclohexyl etc. Further, when j is an integer of 2
20 or more, Q may be the same or different. [0020]
Examples of such bridged metallocene compounds (a) include:
ethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)]

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(η5-fluorenyl) zirconium dichloride, ethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] [η5-(3,6-di-tert-butyl fluorenyl)] zirconium dichloride, ethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] [η5-(2,7-di-tert-butyl 5 fluorenyl)] zirconium dichloride, ethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] (octamethyl
octahydrodibenzfluorenyl) zirconium dichloride, ethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] (benzofluorenyl) zirconium dichloride, ethylene [η5-(3-tert-butyl-5-methyl
10 cyclopentadienyl)] (dibenzofluorenyl) zirconium dichloride, ethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] (octahydrodibenzofluorenyl) zirconium dichloride, ethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] [η5-(2,7-diphenyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride,
15 ethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] [η5-(2,7-dimethyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride;
ethylene [η5-(3-tert-butyl cyclopentadienyl)] (η5-fluorenyl) zirconium dichloride, ethylene [η5-(3-tert-butyl
20 cyclopentadienyl)] [η5-(3,6-di-tert-butyl fluorenyl)] zirconium dichloride, ethylene [η5-(3-tert-butyl cyclopentadienyl)] [η5-(2,7-di-tert-butyl fluorenyl)] zirconium dichloride, ethylene [η5-(3-tert-butyl cyclopentadienyl)] (octamethyl octahydrodibenzfluorenyl)

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zirconium dichloride, ethylene [η5-(3-tert-butyl cyclopentadienyl)] (benzofluorenyl) zirconium dichloride, ethylene [η5-(3-tert-butyl cyclopentadienyl)] (dibenzofluorenyl) zirconium dichloride, ethylene [η5-(3-5 tert-butyl cyclopentadienyl)] (octahydrodibenzofluorenyl) zirconium dichloride, ethylene [η5-(3-tert-butyl cyclopentadienyl)] [η5-(2,7-diphenyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride, ethylene [η5-(3-tert-butyl cyclopentadienyl)] [η5-(2,7-dimethyl-3,6-di-tert-butyl
10 fluorenyl)] zirconium dichloride;
ethylene [η5-(3-n-butyl cyclopentadienyl)] (η5-fluorenyl) zirconium dichloride, ethylene [η5-(3-n-butyl cyclopentadienyl)] [η5-(3,6-di-tert-butyl fluorenyl)] zirconium dichloride, ethylene [η5-(3-n-butyl
15 cyclopentadienyl)] [η5-(2,7-di-tert-butyl fluorenyl)] zirconium dichloride, ethylene [η5-(3-n-butyl cyclopentadienyl)] (octamethyl octahydrodibenzfluorenyl) zirconium dichloride, ethylene [η5-(3-n-butyl cyclopentadienyl)] (benzofluorenyl) zirconium dichloride,
20 ethylene [η5-(3-n-butyl cyclopentadienyl)] (dibenzofluorenyl) zirconium dichloride, ethylene [η5-(3-n-butyl cyclopentadienyl)] (octahydrodibenzofluorenyl) zirconium dichloride, ethylene [η5-(3-n-butyl cyclopentadienyl)] [η5-(2,7-diphenyl-3,6-di-tert-butyl fluorenyl)] zirconium

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dichloride, ethylene [η5-(3-n-butyl cyclopentadienyl)] [η5-(2,7-dimethyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride;
diphenylmethylene [η5-(3-tert-butyl-5-methyl 5 cyclopentadienyl)] (η5-fluorenyl) zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] [η5-(3,6-di-tert-butyl fluorenyl)] zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] [η5-(2,7-di-tert-butyl fluorenyl)]
10 zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] (octamethyl octahydrodibenzfluorenyl) zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] (benzofluorenyl) zirconium dichloride,
15 diphenylmethylene [η5-(3-tert-butyl-5-methyl
cyclopentadienyl)] (dibenzofluorenyl) zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] (octahydrodibenzofluorenyl) zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl-5-methyl
20 cyclopentadienyl)] [η5-(2,7-diphenyl-3,6-di-tert-butyl
fluorenyl)] zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] [η5-(2,7-dimethyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride;
diphenylmethylene [η5-(3-tert-butyl cyclopentadienyl)]

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(η5-fluorenyl) zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl cyclopentadienyl)] [η5-(3,6-di-tert-butyl fluorenyl)] zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl cyclopentadienyl)] [η5-(2,7-di-tert-butyl 5 fluorenyl)] zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl cyclopentadienyl)] (octamethyl octahydrodibenzfluorenyl) zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl cyclopentadienyl)] (benzofluorenyl) zirconium dichloride, diphenylmethylene [η5-
10 (3-tert-butyl cyclopentadienyl)] (dibenzofluorenyl) zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl cyclopentadienyl)] (octahydrodibenzofluorenyl) zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl cyclopentadienyl)] [η5-(2,7-diphenyl-3,6-di-tert-butyl
15 fluorenyl)] zirconium dichloride, diphenylmethylene [η5-(3-tert-butyl cyclopentadienyl)] [η5-(2,7-dimethyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride;
diphenylmethylene [η5-(3-n-butyl cyclopentadienyl)] (η5-fluorenyl) zirconium dichloride, diphenylmethylene [η5-(3-n-
20 butyl cyclopentadienyl)] [η5-(3,6-di-tert-butyl fluorenyl)] zirconium dichloride, diphenylmethylene [η5-(3-n-butyl cyclopentadienyl)] [η5-(2,7-di-tert-butyl fluorenyl)] zirconium dichloride, diphenylmethylene [η5-(3-n-butyl cyclopentadienyl)] (octamethyl octahydrodibenzfluorenyl)

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zirconium dichloride, diphenylmethylene [η5-(3-n-butyl cyclopentadienyl)] (benzofluorenyl) zirconium dichloride, diphenylmethylene [η5-(3-n-butyl cyclopentadienyl)] (dibenzofluorenyl) zirconium dichloride, diphenylmethylene 5 [η5-(3-n-butyl cyclopentadienyl)] (octahydrodibenzofluorenyl) zirconium dichloride, diphenylmethylene [η5-(3-n-butyl cyclopentadienyl)] [η5-(2,7-diphenyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride, diphenylmethylene [η5-(3-n-butyl cyclopentadienyl)] [η5-(2,7-dimethyl-3,6-di-tert-butyl
10 fluorenyl)] zirconium dichloride;
di(p-tolyl) methylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] (η5-fluorenyl) zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] [η5-(3,6-di-tert-butyl fluorenyl)]
15 zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] [η5-(2,7-di-tert-butyl fluorenyl)] zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] (octamethyl octahydrodibenzfluorenyl) zirconium dichloride, di(p-tolyl)
20 methylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)]
(benzofluorenyl) zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] (dibenzofluorenyl) zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)]

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27
(octahydrodibenzofluorenyl) zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl-5-methyl cyclopentadienyl)] [η5-(2,7-diphenyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl-5-methyl 5 cyclopentadienyl)] [η5-(2,7-dimethyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride;
di(p-tolyl) methylene [η5-(3-tert-butyl cyclopentadienyl)] (η5-fluorenyl) zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl cyclopentadienyl)] [η5-
10 (3,6-di-tert-butyl fluorenyl)] zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl cyclopentadienyl)] [η5-(2,7-di-tert-butyl fluorenyl)] zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl cyclopentadienyl)] (octamethyl octahydrodibenzfluorenyl) zirconium dichloride,
15 di(p-tolyl) methylene [η5-(3-tert-butyl cyclopentadienyl)]
(benzofluorenyl) zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl cyclopentadienyl)] (dibenzofluorenyl) zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl cyclopentadienyl)] (octahydrodibenzofluorenyl) zirconium
20 dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl
cyclopentadienyl)] [η5-(2,7-diphenyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride, di(p-tolyl) methylene [η5-(3-tert-butyl cyclopentadienyl)] [η5-(2,7-dimethyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride; and

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di(p-tolyl) methylene [η5-(3-n-butyl cyclopentadienyl)] (η5-fluorenyl) zirconium dichloride, di(p-tolyl) methylene [η5-(3-n-butyl cyclopentadienyl)] [η5-(3,6-di-tert-butyl fluorenyl)] zirconium dichloride, di(p-tolyl) methylene [η5-5 (3-n-butyl cyclopentadienyl)] [η5-(2,7-di-tert-butyl
fluorenyl)] zirconium dichloride, di(p-tolyl) methylene [η5-(3-n-butyl cyclopentadienyl)] (octamethyl
octahydrodibenzfluorenyl) zirconium dichloride, di(p-tolyl) methylene [η5-(3-n-butyl cyclopentadienyl)] (benzofluorenyl)
10 zirconium dichloride, di(p-tolyl) methylene [η5-(3-n-butyl cyclopentadienyl)] (dibenzofluorenyl) zirconium dichloride, di(p-tolyl) methylene [η5-(3-n-butyl cyclopentadienyl)] (octahydrodibenzofluorenyl) zirconium dichloride, di(p-tolyl) methylene [η5-(3-n-butyl cyclopentadienyl)] [η5-(2,7-diphenyl-
15 3,6-di-tert-butyl fluorenyl) zirconium dichloride, di(p-
tolyl) methylene [η5-(3-n-butyl cyclopentadienyl)] [η5-(2,7-dimethyl-3,6-di-tert-butyl fluorenyl)] zirconium dichloride. [0021]
Although compounds whose zirconium atoms were
20 substituted with hafnium atoms, or compounds whose chloro ligands were substituted with methyl groups etc. are exemplified in these compounds, the bridged metallocene compound (a) is not limited to these exemplifications. [0022]

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As the organoaluminum oxy-compound used in the catalyst

system

according

to

the

present

invention,

conventional

aluminoxane can be used. For example, linear

or

ring type

aluminoxane represented by the following Formulas 2 to 5 can

5

be used. A small amount of organic aluminum compound may be

contained in the organoaluminum oxy-compound.
[0023]
[Chem. 5]

R—(-A1

O-)—A1R2 'n

R

(Formula 2)

(-A1—0

n

R

•' (Formula 3)

{-M—o-)^—(-AI—o-)

m

Me

Rx

(Formula 4)

10

In Formulae 2 to 4, R is independently

a

hydrocarbon

group having

1 to 10

carbon atoms,

Rx is

independently

a

SF-3422
30
hydrocarbon group having 2 to 20 carbon atoms, m and n are
independently an integer of 2 or more, preferably 3 or more,
more preferably 10 to 70, and most preferably 10 to 50.
[0024]
5 [Chem. 6]

Rdx f0 Rd
Al—O—B—O—Al'
Rd Rd

■ - (Formula 5)

In Formula 5, Rc is a hydrocarbon group having 1 to 10
carbon atoms, and Rd is independently a hydrogen atom, halogen
10 atom or hydrocarbon group having 1 to 10 carbon atoms.
[0025]
In Formula 2 or Formula 3, R is a methyl group (Me) of
the organoaluminum oxy-compound which is conventionally
referred to as "methylaluminoxane".
15 [0026]
The methylaluminoxane is easily available and has high
polymerization activity, and thus it is commonly used as an
activator in the polyolefin polymerization. However, the
methylaluminoxane is difficult to dissolve in a saturated
20 hydrocarbon, and thus it has been used as a solution of aromatic

SF-3422
31
hydrocarbon such as toluene or benzene, which is
environmentally undesirable. Therefore, in recent years, a
flexible body of methylaluminoxane represented by Formula 4
has been developed and used as an aluminoxane dissolved in the
5 saturated hydrocarbon. The modified methylaluminoxane
represented by Formula 4 is prepared by using a trimethyl aluminum and an alkyl aluminum other than the trimethyl aluminum as shown in US Patent 4960878 and US Patent 5041584, and for example, is prepared by using trimethyl aluminum and
10 triisobutyl aluminum. The aluminoxane in which Rx is an
isobutyl group is commercially available under the trade name of MMAO and TMAO, in the form of a saturated hydrocarbon solution. (See Tosoh Finechem Corporation, Tosoh Research & Technology Review, Vol 47, 55 (2003)).
15 [0027]
As (ii) the compound which reacts with the bridged metallocene compound to form ion pairs (hereinafter, referred to as "ionic compound" as required) which is contained in the present catalyst system, a Lewis acid, ionic compounds, borane,
20 borane compounds and carborane compounds can be used. These
are described in Korean Patent No. 10-551147, Japanese Unexamined Publication H01-501950, Japanese Unexamined Publication H03-179005, Japanese Unexamined Publication H03-179006, Japanese Unexamined Publication H03-207703, Japanese

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Unexamined Publication H03-207704, USP 5321106 and so on. If
needed, heteropoly compounds, and isopoly compound etc. can be
used, and the ionic compound disclosed in Japanese Unexamined
Publication 2004-051676 can be used. The ionic compound may be
5 used alone or by mixing two or more. In more detail, examples
of the Lewis acid include the compound represented by BR3 (R is fluoride, substituted or unsubstituted alkyl group having 1 to 20 carbon atoms (methyl group, etc.), substituted or unsubstituted aryl group having 6 to 20 carbon atoms (phenyl
10 group, etc.), and also includes for example, trifluoro boron,
triphenyl boron, tris(4-fluorophenyl) boron, tris(3,5-difluorophenyl) boron, tris(4-fluorophenyl) boron, tris(pentafluorophenyl) and boron tris(p-tolyl) boron. When the ionic compound is used, its use amount and sludge amount
15 produced are relatively small in comparison with the
organoaluminum oxy-compound, and thus it is economically advantageous. In the present invention, it is preferable that the compound represented by the following Formula 6 is used as the ionic compound.
20 [0028]
[Chem. 7]

SF-3422

33

Rg
pe R B"~~"R
R
i (Formula 6)
In Formula 6, Re+ is H+, a carbenium cation, an oxonium cation, an ammonium cation, a phosphonium cation, a cycloheptyltrienyl cation, or a ferrocenium cation having a 5 transition metal, and Rf to Ri each is independently an organic group, preferably a hydrocarbon group having 1 to 20 carbon atoms, and more preferably an aryl group, for example, a penta-fluorophenyl group. Examples of the carbenium cation include a tris(methylphenyl)carbenium cation and a
10 tris(dimethylphenyl)carbenium cation, and examples of the ammonium cation include a dimethylanilinium cation. [0029]
Examples of compounds represented by the aforementioned Formula 6 preferably include N,N-dialkyl anilinium salts, and
15 specifically include N,N-dimethylanilinium tetraphenylborate, N,N-dimethylanilinium tetrakis (pentafluorophenyl) borate, N,N-dimethylanilinium tetrakis (3,5-ditrifluoro methylphenyl) borate, N,N-diethyl anilinium tetraphenylborate, N,N-diethyl

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anilinium tetrakis (pentafluorophenyl) borate, N,N-diethyl anilinium tetrakis (3,5-ditrifluoro methylphenyl) borate, N,N-2,4,6-penta methylanilinium tetraphenylborate, and N,N-2,4,6-penta methylanilinium tetrakis (pentafluorophenyl) borate. 5 [0030]
The catalyst system used in the present invention further
includes a (c) organoaluminum compound when it is needed. The
organoaluminum compound plays a role of activating the bridged
metallocene compound, the organoaluminum oxy-compound, and the
10 ionic compound, etc. As the organoaluminum compound, preferably
an organoaluminum represented by the following Formula 7, and
alkyl complex compounds of the Group 1 metal and aluminum
represented by the following Formula 8 can be used.
[0031]
15 RamAl(ORb)nHpXq … Formula 7
In Formula 7, Ra and Rb each is independently a hydrocarbon group having 1 to 15 carbon atoms, preferably 1 to 4 carbon atoms, and X is a halogen atom, m is an integer of 0 0.03
(II) Mineral Oil 80 to 120 ≥ 90 ≤ 0.03
(III) Mineral Oil ≥ 120 ≥ 90 ≤ 0.03
(IV) Poly-α-olefin
(V) Lubricating oil bases other than those described above
10 *1: Measured in accordance with ASTM D445 (JIS K2283) *2: Measured in accordance with ASTM D3238 *3: Measured in accordance with ASTM D4294 (JIS K2541) *4: Mineral oils, whose saturated hydrocarbon content is less than 90 (vol%) and sulfur content is less than 0.03% by weight,
15 or whose saturated hydrocarbon content is 90 (vol%) or more and sulfur content exceeds 0.03% by weight are included in the Group (I)
Poly α-olefin belonging to the Group (IV) in Table 1 is

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a hydrocarbon polymer obtained by polymerizing an α-olefin having 8 or more carbon atoms as at least a source monomer, and examples include such as polydecene obtained by polymerizing decene-1. Such an α-olefin oligomer can be 5 prepared by cationic polymerization, thermal polymerization or free radical polymerization using a Ziegler catalyst or Lewis acid as a catalysts. [0046]
Examples of the lubricating oil bases belonging to the
10 Group (V) in Table 1 include alkylbenzenes, alkylnaphthalenes and ester oils. [0047]
Most of the alkyl benzenes and alkyl naphthalenes are usually dialkyl benzene or dialkyl naphthalene whose alkyl
15 chain length has 6 to 14 carbon atoms, where such alkyl benzenes or alkyl naphthalenes are produced by the Friedel-Crafts alkylation reaction of benzene or naphthalene with olefin. In the production of alkyl benzenes or alkyl naphthalenes, the alkylated olefin to be utilized may be a linear or branched
20 olefin, or may be a combination of these. These production processes are described in e.g. US Patent 3909432. [0048]
Examples of ester oils include monoesters prepared from a monobasic acid and alcohol; diesters prepared from dibasic

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42
acid and alcohol, or from a diol with a monobasic acid or an
acid mixture; or polyolesters prepared by reacting a monobasic
acid or an acid mixture with a diol, triol (e.g.,
trimethylolpropane), tetraol, (e.g., pentaerythritol), hexol
5 (e.g., dipentaerythritol) etc. Examples of these esters include
tridecyl pelargonate, di-2-ethyl hexyl adipate, di-2-ethyl
hexyl azelate, trimethylolpropane triheptanoate,
pentaerythritol tetraheptanoate.
[0049]
10 The synthetic oil (B) according to the present invention
is a lubricating oil base having the properties (B1) to (B3)
below and belonging to the Groups (IV) or (V) according to the
API quality classification, and among them, a poly α-olefin
belonging to the Group (IV) is preferable. Furthermore, the
15 synthetic oil (b) according to the present invention may also
contain 20% by weight or less of a synthetic oil such as a
polyol ester or a diester having similar kinetic viscosity and
belonging to the Group (V).
[0050]
20 (B1) The synthetic oil has a kinematic viscosity at 100°C
of 2 to 20 mm2/s, preferably 4 to 10 mm2/s
(B2) The synthetic oil has a viscosity index of 120 or more, preferably 130 or more
(B3) The synthetic oil has a pour point of -30°C or lower,

SF-3422
43
preferably -40°C or lower
In addition, the mineral oil (C) is a lubricating oil
base having the properties of (C1) to (C3) below, and a
lubricating oil base classified into the Group (III) in the
5 API quality classification.
[0051]
The lubricating oil base classified in the Group (III)
is a lubricating oil base having high purification level due
to such as hydrogenolysis method, and having a high viscosity
10 index.
[0052]
(C1) The mineral oil has a kinematic viscosity at 100°C of 2 to 10 mm2/s, preferably 4 to 8 mm2/s
(C2) The mineral oil has a viscosity index of 120 or more,
15 preferably 125 or more
(C3) The mineral oil has a pour point of -10°C or lower, preferably -15°C or lower
The lubricating oil base in the present invention
consists of one or more components selected from the synthetic
20 oil (B) or the mineral oil (C), and may consist of one type or
two or more types of only the synthetic oil (B), and of one type or two or more types of only the mineral oil (C), or may be prepared or may be prepared by mixing one type or two or more types of the synthetic oil(s) (B) and one type or two or

SF-3422
44
more types of the mineral oil(s) (C). [0053]
In addition, each property described above was measured by the following methods. 5 [0054]
(B1, C1): Measured in accordance with ASTM D445 (JIS K2283)
(B2, C2): Measured in accordance with ASTM D2270 (JIS
K2283)
10 (B3, C3): Measured in accordance with ASTM D97 (JIS
K2269)
[0055]
Lubricating Oil Composition
15 The lubricating oil composition in the present invention
is a composition that comprises 10 to 70% by weight of a lubricating oil base consisting of one or more components selected from the synthetic oil (B) or the mineral oil (C), and 30 to 90% by weight of the ethylene•α-olefin copolymer (A)
20 (note that the sum total of the components (A), (B) and (C) is 100% by weight). In addition, the lubricating oil composition in the present invention is preferably a composition comprising 40 to 80% by weight, more preferably 40 to 70% by weight of the ethylene•α-olefin copolymer (A) .

SF-3422
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[0056]
Such a lubricating oil composition is characterized by having excellent shear stability, and it exhibits a good low-temperature property and shear stability by containing 5 synthetic oils such as a poly α-olefin and/or mineral oils which is highly purified and has high-viscosity index as the lubricating oil base, and further has thermal and oxidation stability. [0057]
10 The lubricating oil composition in the present invention
can, as required, mix additives such as pour point lowering agents, extreme pressure agents, friction modifying agents, oiliness agents, antioxidants, anti-foamers, anticorrosive agents, and corrosion preventing agents in, generally a ratio
15 of 20 weight parts or less, for the sum total of 100 weight parts of the components of (A), (B), and (C). Among these additives, it is preferable to add extreme pressure agents and pour point lowering agents, (especially in the case containing 20% by weight or more of the mineral oil (C)) and it is more
20 preferable to add10% by weight or less of two components, namely extreme pressure agents and pour point lowering agents), with respect to 100 weight parts of (A)+(B)+(C). [0058]
Here, additives used in combination as required are

SF-3422
46
explained.
Pour Point lowering agent
Examples of pour point lowering agents can include such
as polymers or copolymers of alkyl methacrylate, polymers or
5 copolymers of alkyl acrylate, polymers or copolymers of alkyl
fumarate, polymers or copolymers of alkyl maleate, and alkyl aromatic-based compounds. Among these, a polymethacrylate-based pour point lowering agents that is a pour point lowering agents comprising polymers or copolymers of alkyl methacrylate
10 is especially preferable, the carbon atoms of the alkyl group
of the alkyl methacrylate are preferably 12 to 20, and the addition amount thereof is preferably 0.05 to 2 parts by weight with respect to the total 100 parts by weight of the components (A), (B) and (C). These can be obtained from those commercially
15 available as pour point lowering agents. Examples of commercial
brands include ACLUBE 146 and ACLUBE 136 made by Sanyo Chemical Industries, Ltd. and LUBRAN 141 and LUBRAN 171 made by TOHO Chemical Industry Co., Ltd. [0059]
20 Extreme Pressure Agent
Examples of extreme pressure agents include sulfide oils and fats, olefin sulfide, sulfides, phosphate ester, phosphite ester, phosphate ester amine salt, and phosphite ester amine salt.

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[0060]
Friction Modifying Agent
Examples of friction modifying agents include organic
metal-based friction modifying agents, which are represented
5 by organic molybdenum compounds such as molybdenum
dithiophosphate and molybdenum dithiocarbamate. [0061]
Moreover, examples of oiliness agents include fatty acids,
fatty acid esters, and higher alcohols, having alkyl groups of
10 8 to 22 carbon atoms.
[0062] Antioxidant
Specific examples of antioxidant include phenol-based
antioxidants such as 2,6-di-t-butyl-4-methylphenol; and amine-
15 based antioxidants such as dioctyl diphenylamine. Examples of
anti-foamers can include silicon-based anti-foamers such as
dimethylsiloxane and silica gel dispersion; and alcohol- and
an ester-based anti-foamers.
[0063]
20 Anticorrosive agent
Examples of anticorrosive agents include carboxylic acids, carboxylate salts, esters, and phosphoric acids. Examples of corrosion preventing agents can include benzotriazole and derivatives thereof, and thiazole-based compounds.

SF-3422
48
[0064]
Moreover, examples of corrosion preventing agents include
benzotriazole-based, thiadiazole-based, and imidazole-based
compounds.
5 [0065]
Because of especially having excellent shear stability
and low-temperature viscosity properties, the lubricating oil
composition in the present invention is effective as an
industrial lubricating oil. Examples of industrial lubricating
10 oils include those having the viscosity range of ISO 220 to
ISO 680, and it is especially effective as oil for gears for wind power generation.
EXAMPLES
15 [0066]
The present invention is specifically explained based on
the below Examples. Various physical properties in Examples
were measured as explained below.
[0067]
20 • Ethylene content
Ethylene content was measured under the conditions of
120°C, pulse width of 45° pulse, and pulse repeating time of
5.5 seconds in a mixed solvent of ortho dichlorobenzene and
benzene-d6 (ortho dichlorobenzene/benzene-d6 = 3/1 to 4/1

SF-3422
49
(volume ratio) using LA500 nuclear magnetic resonance apparatus made by JEOL Ltd.
[0068]
• B-value
5 Employing o-dichlorobenzene / benzene-d6 (4/1 [vol/vol%])
as a measurement solvent, the 13C-NMR spectrum was measured under the measuring conditions (100 MHz, ECX 400P, made by JEOL Ltd) of temperature of 120°C, spectral width of 250 ppm, pulse repeating time of 5.5 seconds, and a pulse width of 4.7 μsec 10 (45o pulse), or under the measuring conditions (125 MHz, AVANCE III Cryo-500 made by Bruker Biospin Inc) of temperature of 120°C, spectral width of 250 ppm, pulse repeating time of 5.5 seconds, and a pulse width of 5.0 μsec (45o pulse), and the B-value was calculated based on the following Formula [1].
15 [0069]
[Formula 1]

In Formula [1], PE indicates the molar fraction contained
in the ethylene component, PO indicates the molar fraction
20 contained in the α-olefin component, and POE indicates the molar

SF-3422
50
fraction of the ethylene-α-olefin sequences of all dyad sequences.
• Kinematic viscosity (40°C, 100°C)
The measurements were performed according to ASTM D 445.
5 In Examples, the viscosity of the compounding oil was adjusted
as follows based on each ISO classification. [0070]
• ISO220: The kinematic viscosity (40°C) was adjusted to
be 220+/-22 mm2/s by compounding.
10 [0071]
• ISO320: The kinematic viscosity (40°C) was adjusted to
be 320+/-32 mm2/s by compounding.
[0072]
• ISO460: The kinematic viscosity (40°C) was adjusted to
15 be 460+/-46 mm2/s by compounding.
[0073] •
• Weight average molecular weight (Mw), Molecular weight
distribution (Mw/Mn)
20 Weight average molecular weight (Mw) and molecular weight
distribution (Mw/Mn) were measured at 140°C in ortho dichlorobenzene solvent using GPC (gel permeation chromatography). [0074]

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• Low-temperature viscosity (-30°C)
Measurement was performed according to ASTM D341 using
BF (Brookfield) viscometer.
[0075]
5 • Viscosity index
The viscosity index was measured and calculated by the method described in JIS K2283. [0076]
• Shear stability (viscosity decreasing ratio %)
10 Tests were performed according to CEC-L-45 (CEC: The
Coordinating European Council, the management institute of test methods for automobile fuel and lubricating oil in Europe) using KRL shear tester, and viscosity decreasing ratio at 40°C was assessed.
15 [0077]
Shear stability is a measure of kinematic viscosity loss by copolymeric components of the lubricating oil sheared at the metal slide portion with molecular chains being cut. [0078]
20 • Micro-pitching failure-load stage
The load is increased from state 5 to 10 stepwise, micro-pitching generation area on gear tooth flank is expressed in % on each load stage, and weight loss on whole gear is also measured by FVA-54 micro-pitching tester according to the

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standard of Flender GmbH. (rotation speed: 1500 rpm, temperature: 90°C) [0079]
• Thermal and oxidation stability
5 The thermal and oxidation stability was based on the
method of stability test for acid number of lubricating oil for internal combustion engine described in JIS K2514, and lacquer level 72 hours after the test time was assessed. [0080]
10 [Polymerization Example 1]
760 ml of heptane and 120 g of propylene were charged into a stainless steel autoclave with a volume of 2 L sufficiently substituted with nitrogen, and the temperature in the system was raised to 150°C, and then 0.85 MPa of hydrogen
15 and 0.19 MPa of ethylene were supplied to raise the total
pressure to 3 MPaG. Then, 0.4 mmol of triisobutyl aluminum,
0.0002 mmol of [diphenylmethylene(η5-(3-n-butyl
cyclopentadienyl) (η5-(2,7-di-t-butyl fluorenyl)] zirconium dichloride, and 0.002 mmol of N,N-dimethylanilinium tetrakis
20 (pentafluorophenyl) borate were injected with nitrogen, and
polymerization was started by stirring with a rotation of 400 rpm. Ethylene was then continuously supplied to keep the total pressure at 3 MPaG, and polymerization took place at 150°C for 5 minutes. Polymerization was stopped by adding a small amount

SF-3422
53
of ethanol in the system, and the unreacted ethylene, propylene
and hydrogen were purged. The resulting polymer solution was
washed 3 times with 1000 ml of a 0.2 mol/L solution of
hydrochloric acid, further washed 3 times with 1000 ml of
5 distilled water, dried with magnesium sulfate, and the solvent
was then distilled off under reduced pressure. The resulting polymer was dried at 80°C under reduced pressure for 10 hours. The ethylene content of the resulting polymer (polymer 1) was 49.5 mol%, Mw was 5,100, Mw/Mn was 1.7, B-value was 1.2, and a
10 kinematic viscosity at 100°C was 150 mm2/s.
[0081] [Polymerization Example 2]
760 ml of heptane and 120 g of propylene were charged into a stainless steel autoclave with a volume of 2 L
15 sufficiently substituted with nitrogen, and the temperature in
the system was raised to 150°C, and then 0.85 MPa of hydrogen and 0.19 MPa of ethylene were supplied to raise the total pressure to 3 MPaG. Then, 0.4 mmol of triisobutyl aluminum, 0.0002 mmol of dimethylsilyl bis(indenyl)zirconium dichloride,
20 and 0.059 mmol of MMA were injected with nitrogen, and
polymerization was started by stirring with a rotation of 400 rpm. Ethylene was then continuously supplied to keep the total pressure at 3 MPaG, and polymerization took place at 150°C for 5 minutes. Polymerization was stopped by adding a small amount

SF-3422
54
of ethanol in the system, and the unreacted ethylene, propylene and hydrogen were purged. The resulting polymer solution was washed 3 times with 1000 ml of a 0.2 mol/L solution of hydrochloric acid, further washed 3 times with 1000 ml of 5 distilled water, dried with magnesium sulfate, and the solvent was then distilled off under reduced pressure. The resulting polymer was dried at 80°C under reduced pressure for 10 hours. The ethylene content of the resulting polymer (Polymer 2) was 48.5 mol%, Mw was 5,000, Mw/Mn was 1.8, B-value was 1.2, and a 10 kinematic viscosity at 100°C was 150 mm2/s. [0082] [Polymerization Example 3]
250 mL of heptane was charged into a glass polymerization
vessel with a volume of 1 L sufficiently substituted with
15 nitrogen, and the temperature in the system was raised to 130°C,
and then 25 L/hr of ethylene, 75 L/hr of propylene, and 100
L/hr of hydrogen were continuously supplied into the
polymerization vessel, and stirred with a rotation of 600 rpm.
Then, 0.2 mmol of triisobutyl aluminum was charged into a
20 polymerization vessel, and 1.213 mmol of MMAO and 0.00402 mmol
of [[diphenylmethylene(η5-(3-n-butyl cyclopentadienyl) (η5-
(2,7-di-t-butyl fluorenyl)] zirconium dichloride, which were
pre-mixed in toluene for 15 minutes or more, were charged into
a polymerization vessel to start the polymerization. Ethylene,

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55
propylene and hydrogen were then continuously supplied, and
polymerization took place at 130°C for 15 minutes.
Polymerization was stopped by adding a small amount of isobutyl
alcohol in the system, and the unreacted monomers were purged.
5 The resulting polymer solution was washed 3 times with 100 mL
of a 0.2 mol/L solution of hydrochloric acid, further washed 3 times with 100 mL of distilled water, dried with magnesium sulfate, and the solvent was then distilled off under reduced pressure. The resulting polymer was dried overnight at 80°C
10 under reduced pressure to obtain 0.77 g of an ethylene-
propylene copolymer. The ethylene content of the resulting polymer (Polymer 3) was 48.8 mol%, Mw was 4,100, Mw/Mn was 1.7, B-value was 1.2, and kinematic viscosity at 100°C was 100 mm2/s. [0083]
15 [Polymerization Example 4]
250 mL of heptane was charged into a glass polymerization vessel with a volume of 1 L sufficiently substituted with nitrogen, and the temperature in the system was raised to 130°C, and then 25 L/hr of ethylene, 75 L/hr of propylene, and 100
20 L/hr of hydrogen were continuously supplied into the
polymerization vessel, and stirred with a rotation of 600 rpm. Then, 0.2 mmol of triisobutyl aluminum was charged into a polymerization vessel, and 1.213 mmol of MMAO and 0.00402 mmol of dimethylsilyl bis(indenyl)zirconium dichloride, which were

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56
pre-mixed in toluene for 15 minutes or more, were charged into
a polymerization vessel to start the polymerization. Ethylene,
propylene and hydrogen were then continuously supplied, and
polymerization took place at 130°C for 15 minutes.
5 Polymerization was stopped by adding a small amount of isobutyl
alcohol in the system, and the unreacted monomers were purged. The resulting polymer solution was washed 3 times with 100 mL of a 0.2 mol/L solution of hydrochloric acid, further washed 3 times with 100 mL of distilled water, dried with magnesium
10 sulfate, and the solvent was then distilled off under reduced
pressure. The resulting polymer was dried overnight at 80°C under reduced pressure to obtain 0.77 g of an ethylene-propylene copolymer. The ethylene content of the resulting polymer (Polymer 4) was 48.7 mol%, Mw was 4,200, Mw/Mn was 1.8,
15 B-value was 1.2, and kinematic viscosity at 100°C was 100 mm2/s.
[0084] [Example 1]
54.0% by weight of Polymer 3 obtained in Polymerization Example 3 as the ethylene•propylene copolymer (A), 33.3% by
20 weight of poly•α-olefin (NEXBASE 2006 made by NESTE OIL) whose
kinematic viscosity at 100°C is 5.825 mm2/s and classified in API Group (IV) as lubricating oil base, 10.0% by weight of fatty acid ester DIDA (made by DAIHACHI CHEMICAL INDUSTRY CO., LTD) classified in API Group (V), and 2.7 parts by weight of

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57
extreme pressure agent HITEC307 (made by AFTON) were compounded
and the viscosity was adjusted to correspond to ISO220.
Physical properties of the lubricating oil of the compounding
oil are shown in Table 2.
5 [0085]
[Example 2]
The components were compounded similarly to Example 1 except that 47.0% by weight of Polymer 1 obtained in Polymerization Example 1 was used instead of 54.0% by weight
10 of Polymer 3 and the compounded amount of the poly•α-olefin
(NEXBASE 2006) was 40.3% by weight, and the viscosity of the compound was adjusted to correspond to ISO220. Physical properties of the lubricating oil of the compounding oil are shown in Table 2.
15 [0086]
[Example 3]
The components were compounded similarly to Example 1 except that the compounded amount of Polymer 3 was 64.0% by weight and the compounded amount of poly•α-olefin (NEXBASE
20 2006) was 23.3% by weight, and the viscosity of the compound
was adjusted to correspond to ISO320. Physical properties of the lubricating oil of the compounding oil are shown in Table 2. [0087]

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[Example 4]
The components were compounded similarly to Example 2
except that the compounded amount of Polymer 1 was 55.0% by
weight and the compounded amount of poly•α-olefin (NEXBASE
5 2006) was 32.3% by weight, and the viscosity of the compound
was adjusted to correspond to ISO220. Physical properties of
the lubricating oil of the compounding oil are shown in Table
2.
[0088]
10 [Example 5]
The components were compounded similarly to Example 1
except that the compounded amount of Polymer 3 was 75.0% by
weight and the compounded amount of poly•α-olefin (NEXBASE
2006) was 12.3% by weight, and the viscosity of the compound
15 was adjusted to correspond to ISO460. Physical properties of
the lubricating oil of the compounding oil are shown in Table
2.
[0089] [Example 6]
20 The components were compounded similarly to Example 2
except that the compounded amount of Polymer 1 was 64.0% by
weight and the compounded amount of poly•α-olefin (NEXBASE
2006) was 23.3% by weight, and the viscosity of the compound
was adjusted to correspond to ISO460. Physical properties of

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59
the lubricating oil of the compounding oil are shown in Table 2.
[0090]
[Example 7]
5 48.0% by weight of Polymer 3 obtained in Polymerization
Example 3 as the ethylene•propylene copolymer (A), 48.8% by
weight of mineral oil YUBASE-6 classified as API Group (III)
as a lubricating oil base, 2.7 parts by weight of extreme
pressure agent HITEC307, and 0.5 parts by weight of pour point
10 lowering agents ACLUBE 146 were compounded, and the viscosity
of the compound was adjusted to correspond to ISO220. Physical
properties of the lubricating oil of the compounding oil are
shown in Table 2.
[0091]
15 [Example 8]
The components were compounded similarly to Example 7
except that 41.0% by weight of Polymer 1 obtained in
Polymerization Example 1 was used instead of 48.0% by weight
of Polymer 3 and the compounded amount of mineral oil YUBASE-
20 6 was 55.8% by weight, and the viscosity of the compound was
adjusted to correspond to ISO220. Physical properties of the
lubricating oil of the compounding oil are shown in Table 2.
[0092]
[Example 9]

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60
The components were compounded similarly to Example 7
except that the compounded amount of Polymer 3 was 59.0% by
weight and the compounded amount of mineral oil YUBASE-6 was
37.8% by weight, and the viscosity of the compound was adjusted
5 to correspond to ISO320. Physical properties of the lubricating
oil of the compounding oil are shown in Table 2. [0093] [Example 10]
The components were compounded similarly to Example 8
10 except that the compounded amount of Polymer 1 was 50.0% by
weight and the compounded amount of mineral oil YUBASE-6 was 46.8% by weight, and the viscosity of the compound was adjusted to correspond to ISO220. Physical properties of the lubricating oil of the compounding oil are shown in Table 2.
15 [0094]
[Example 11]
The components were compounded similarly to Example 7 except that the compounded amount of Polymer 3 was 69.0% by weight and the compounded amount of mineral oil YUBASE-6 was
20 27.8% by weight, and the viscosity of the compound was adjusted
to correspond to ISO460. Physical properties of the lubricating oil of the compounding oil are shown in Table 2. [0095] [Example 12]

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61
The components were compounded similarly to Example 8
except that the compounded amount of Polymer 1 was 59.0% by
weight and the compounded amount of mineral oil YUBASE-6 was
37.8% by weight, and the viscosity of the compound was adjusted
5 to correspond to ISO220. Physical properties of the lubricating
oil of the compounding oil are shown in Table 2. [0096] [Comparative Example 1]
The components were compounded similarly to Example 1
10 except that 54.0% by weight of Polymer 4 obtained in
Polymerization Example 4 was used instead of 54.0% by weight of Polymer 3, and the viscosity of the compound was adjusted to correspond to ISO220. Physical properties of the lubricating oil of the compounding oil are shown in Table 2.
15 [0097]
[Comparative Example 2]
The components were compounded similarly to Example 1 except that 47.0% by weight of Polymer 2 obtained in Polymerization Example 2 was used instead of 54.0% by weight
20 of Polymer 3 and the compounded amount of the poly•α-olefin
(NEXBASE 2006) was 40.3% by weight, and the viscosity of the compound was adjusted to correspond to ISO220. Physical properties of the lubricating oil of the compounding oil are shown in Table 2.

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[0098]
[Comparative Example 3]
The components were compounded similarly to Example 1
except that 64.0% by weight of Polymer 2 obtained in
5 Polymerization Example 2 was used instead of 54.0% by weight
of Polymer 3 and the compounded amount of the poly•α-olefin (NEXBASE 2006) was 23.3% by weight, and the viscosity of the compound was adjusted to correspond to ISO220. Physical properties of the lubricating oil of the compounding oil are
10 shown in Table 2.
[0099] [Comparative Example 4]
The components were compounded similarly to Example 11 except that 69.0% by weight of Polymer 4 obtained in
15 Polymerization Example 4 was used instead of 69.0% by weight
of Polymer 3, and the viscosity of the compound was adjusted to correspond to ISO460. Physical properties of the lubricating oil of the compounding oil are shown in Table 2. [0100]
20 [Comparative Example 5]
The components were compounded similarly to Example 12 except that 59.0% by weight of Polymer 2 obtained in Polymerization Example 2 was used instead of 59.0% by weight of Polymer 1, and the viscosity of the compound was adjusted

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to correspond to ISO220. Physical properties of the lubricating oil of the compounding oil are shown in Table 2. [0101] [Table 2]

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64

Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 Ex. 8 Ex. 9 Ex. 10 Ex. 11 Ex. 12
Polymer 1 % by weight 47.0 55.0 64.0 41.0 50.0 59.0
Polymer 2 % by weight
Polymer 3 % by weight 54.0 64.0 75.0 48.0 59.0 69.0
Polymer 4 % by weight
Poly-α-olefin % by weight 33.3 40.3 23.3 32.3 12.3 23.3
fatty acid ester % by weight 10.0 10.0 10.0 10.0 10.0 10.0
Mineral Oil % by weight 48.8 55.8 37.8 46.8 27.8 37.8
Extreme Pressure Agent % by weight 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7
Pour Point Lowering Agent % by weight 0.5 0.5 0.5 0.5 0.5 0.5
Kinematic Viscosity at 40°C Mm2/s 225 218 325 319 456 455 232 220 321 318 458 470
Viscosity Index - 162 164 162 166 162 164 151 156 154 161 162 166
Viscosity at -30°C mPa•s 79,000 68,000 170,000 140,000 260,000 200,000 79,000 61,000 140,000 110,000 240,000 180,000
Viscosity
decreasing ratio at Shear
test % <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
Micro-pitching failure-load stage Stage >10 >10 >10 >10 >10 >10 >10 >10 >10 >10 >10 >10
ISOT Lacquer level Attachment Attachment Attachment Attachment Attachment Attachment Attachment Attachment Attachment Attachment Attachment Attachment (thin) (thin) (thin) (thin) (thin) (thin) (thin) (thin) (thin) (thin) (thin) (thin)

65

Comp. ex. 1 Comp. ex. 2 Comp. ex. 3 Comp. ex. 4 Comp. ex. 5
Polymer 1 % by weight
Polymer 2 % by weight 47.0 64.0 59.0
Polymer 3 % by weight
Polymer 4 % by weight 54.0 69.0
Poly-α-olefin % by weight 33.3 40.3 23.3
fatty acid ester % by weight 10.0 10.0 10.0
Mineral Oil % by weight 27.8 37.8
Extreme Pressure Agent % by weight 2.7 2.7 2.7 2.7 2.7
Pour Point Lowering Agent % by weight 0.5 0.5
Kinematic Viscosity at 40°C Mm2/s 223 220 460 455 465
Viscosity Index - 161 164 166 160 163
Viscosity at -30°C mPa•s 78,000 69,000 220,000 220,000 170,000
Viscosity
decreasing ratio at Shear
test % <1.0 <1.0 <1.0 <1.0 <1.0
Micro-pitching failure-load stage Stage >10 >10 >10 >10 >10
ISOT Lacquer level Attachment (thick) Attachment (thick) Attachment (thick) Attachment (thick) Attachment (thick)

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Industrial Applicability [0102]
Because of having excellent low-temperature viscosity
properties and shear stability, as well as thermal and
5 oxidation stability, the lubricating oil composition of the
present invention is excellent for energy conservation and resource saving, and it is suitably effective as an industrial lubricating oil, especially a lubricating oil for wind power generation. 10

CLAIMS

1.A lubricating oil containing 30 to 90% by weight of a liquid random copolymer (A) of ethylene and α-olefin prepared 5 by the below method (α), and 10 to 70% by weight of a
lubricating oil base consisting of one or more components selected from a synthetic oil (B) having the properties of (B1) to (B3) or a mineral oil (C) having the properties of (C1) to (C3) (note that the sum total of the components (A),
10 (B) and (C) is 100% by weight).
(B1) The synthetic oil has a kinematic viscosity at 100°C of 2 to 20 mm2/s
(B2) The synthetic oil has a viscosity index of 130 or more (B3) The synthetic oil has a pour point of -30°C or lower
15 (C1) The mineral oil has a kinematic viscosity at 100°C of 2 to 10 mm2/s
(C2) The mineral oil has a viscosity index of 120 or more (C3) The mineral oil has a pour point of -10°C or lower (Method (α))
20 a method (α) for preparing a liquid random copolymer of
ethylene and α-olefin,
comprising a step of carrying out solution polymerization of ethylene and α-olefin having 3 to 20 carbon atoms, under a catalyst system containing

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(a) a bridged metallocene compound represented by the following Formula 1 and
(b) at least one compound selected from a group consisting of
(i) an organoaluminum oxy-compound, and
5 (ii) a compound which reacts with the bridged
metallocene compound to form ion pairs. [Chem. 1]

R R •■■ (Formula 1)
[In Formula 1, R1, R2, R3, R4, R5, R8, R9 and R12 are 10 respectively and independently hydrogen atom, hydrocarbon

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group or silicon-containing hydrocarbon group, and adjoining groups are optionally connected to each other to form a ring structure,
R6 and R11, being the same, are hydrogen atom,
5 hydrocarbon group or silicon-containing hydrocarbon group,
R7 and R10, being the same, are hydrogen atom, hydrocarbon group or silicon-containing hydrocarbon group,
R6 and R7 are optionally connected to hydrocarbon having
2 to 3 carbon atoms to form a ring structure,
10 R11 and R10 are optionally connected to hydrocarbon
having 2 to 3 carbon atoms to form a ring structure,
R6, R7, R10 and R11 are not hydrogen atom at the same time;
Y is a carbon atom or silicon atom;
15 R13 and R14 are independently aryl groups;
M is Ti, Zr or Hf;
Q is independently halogen, hydrocarbon group, an
anionic ligand or a neutral ligand which can be coordinated
to a lone pair of electrons; and
20 j is an integer of 1 to 4.]
2. The lubricating oil composition according to Claim 1, wherein in the metallocene compound represented by the above Formula 1, at least one among substituents (R1, R2, R3 and

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R4) bonded to a cyclopentadienyl group, is a hydrocarbon group having 4 or more carbon atoms.
3. The lubricating oil composition according to Claim 1 or
5 2, wherein R6 and R11, being the same, are hydrocarbon groups
having 1 to 20 carbon atoms.
4. The lubricating oil composition according to any one of
Claims 1 to 3, wherein in the metallocene compound
10 represented by the above Formula 1, substituent (R2 or R3)
bonded to the 3-position of the cyclopentadienyl group is a hydrocarbon group.
5. The lubricating oil composition according to Claim 4,
15 wherein in the metallocene compound represented by the above
Formula 1, the hydrocarbon group (R2 or R3) bonded to the 3-position of the cyclopentadienyl group is an n-butyl group.
6. The lubricating oil composition according to any one of
20 Claims 1 to 5, wherein in the metallocene compound
represented by the Formula 1, substituents (R6 and R11) bonded to the 2-position and the 7-position of the fluorenyl group are all tert-butyl groups.

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7.

The lubricating oil composition according to any one of

Claims 1 to 6, wherein the compound which reacts with the bridged metallocene compound to form an ion pairs is a compound represented by the Formula 6 below:

5

[Chem. 2]

R9

R

e R

f

B—R

h

R1

* P •

(Formula 6)

[In Formula 6, Re+ is H+, a carbenium cation, an oxonium cation, an ammonium cation, a phosphonium cation, a cycloheptyltrienyl cation, or a ferrocenium cation having a

10

transition metal, and Rf to Ri each is independently a

hydrocarbon group having 1 to 20 carbon atoms.]

8.

The lubricating oil composition according to Claim 7,

wherein the ammonium cation is a dimethylanilinium cation.
15

9.

The lubricating oil composition according to Claim 7 or

8, wherein the catalyst system further comprises an

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organoaluminum compound selected from a group consisting of trimethyl aluminum and triisobutyl aluminum.
10. The lubricating oil composition according to any one of
5 Claim 1 to 9, wherein the copolymer (A) is a copolymer
consisting of ethylene and α-olefin having 3 to 10 carbon atoms.
11. The lubricating oil composition according to any one of
10 Claims 1 to 10, wherein the synthetic oil (B) is a
lubricating oil base selected from poly α-olefin (PAO) or ester oil.
12. The lubricating oil composition according to any one of
15 Claims 1 to 11, wherein the lubricating oil composition
further contains a pour point lowering agent.
13. The lubricating oil composition according to any one of
Claims 1 to 12, wherein the viscosity of the lubricating oil
20 composition at 40°C is in the range of 190 to 750 mm2/s.
14. A lubricating oil composition containing 30 to 90% by
weight of a liquid random copolymer of ethylene and α-olefin
having the properties of the below (A1) to (A5), and 10 to

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70% by weight of a lubricating oil base consisting of one or
more components selected from a synthetic oil (B) having the
properties of (B1) to (B3) or a mineral oil (C) having the
properties of (C1) to (C3) (note that the sum total of the
5 components (A), (B) and (C) is 100% by weight).
(A1) The liquid random copolymer comprises 40 to 60 mol% of
the ethylene unit and 60 to 40 mol% of an α-olefin unit
having 3 to 20 carbon atoms
(A2) The liquid random copolymer has a number average
10 molecular weight (Mn) of 500 to 10,000 and a molecular weight
distribution (Mw/Mn, Mw is the weight average of the
molecular weight) of 3 or less measured by gel permeation
chromatography (GPC)
(A3) The liquid random copolymer has kinetic viscosity at
15 100°C of 30 to 5,000 mm2/s
(A4) The liquid random copolymer has a pour point of 30 to -
45°C
(A5) The liquid random copolymer has the bromine number of
0.1g/100g or less
20 (B1) The synthetic oil has a kinematic viscosity at 100°C of
2 to 20 mm2/s
(B2) The synthetic oil has a viscosity index of 130 or more
(B3) The synthetic oil has a pour point of -30°C or lower
(C1) The mineral oil has a kinematic viscosity at 100°C of 2

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to 10 mm2/s
(C2) The mineral oil has a viscosity index of 120 or more
(C3) The mineral oil has a pour point of -10°C or lower
5 15. The lubricating oil composition for industrial use according to any one of Claims 1 to 14, wherein the lubricating oil composition is an oil for gears for wind power generation.
10 16. A method for producing a lubricating oil composition comprising the steps of:
preparing a liquid random copolymer (A) of ethylene and α-olefin by the following method (α), and
preparing a lubricating oil composition by mixing 30 to 15 90% by weight of the liquid random copolymer (A), and 10 to 70% by weight of a lubricating oil base consisting of one or more components selected from a synthetic oil (B) having the properties of (B1) to (B3) or a mineral oil (C) having the properties of (C1) to (C3) (note that the sum total of the 20 components (A), (B) and (C) is 100 parts by weight).
(B1) The synthetic oil has a kinematic viscosity at 100°C of 2 to 10 mm2/s
(B2) The synthetic oil has a viscosity index of 130 or more (B3) The synthetic oil has a pour point of -30°C or lower

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(C1) The mineral oil has a kinematic viscosity at 100°C of 2 to 10 mm2/s
(C2) The mineral oil has a viscosity index of 120 or more (C3) The mineral oil has a pour point of -10°C or lower 5 (Method (α))
a method (α) for preparing a liquid random copolymer of ethylene and α-olefin,
comprising a step of carrying out solution polymerization of ethylene and α-olefin having 3 to 20 carbon atoms, under a 10 catalyst system containing
(a) a bridged metallocene compound represented by the following Formula 1 and
(b) at least one compound selected from a group consisting of
(i) an organoaluminum oxy-compound, and
15 (ii) a compound which reacts with the bridged
metallocene compound to form ion pairs. [Chem. 3]

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76


(Formula 1)

[In Formula 1, R1, R2, R3, R4, R5, R8, R9 and R12 are
respectively and independently hydrogen atom, hydrocarbon
group or silicon-containing hydrocarbon group, and adjoining
5 groups are optionally connected to each other to form a ring
structure,
R6 and R11, being the same, are hydrogen atom,
hydrocarbon group or silicon-containing hydrocarbon group,
R7 and R10, being the same, are hydrogen atom,
10 hydrocarbon group or silicon-containing hydrocarbon group,

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77

R6 and R7 are optionally connected to hydrocarbon having 2 to 3 carbon atoms to form a ring structure,
R11 and R10 are optionally connected to hydrocarbon having 2 to 3 carbon atom to form a ring structure,

5

R6, R7, R10 and R11 are not hydrogen atoms at the same

time;
Y is a carbon atom or silicon atom;
R13 and R14 are independently aryl groups;
M is Ti, Zr or Hf;

10

Q is independently halogen, hydrocarbon group, an

anionic ligand or a neutral ligand which can be coordinated to a lone pair of electrons; and j is an integer of 1 to 4.]