JP2014105220A - Lubricant composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high viscosity lubricant composition excellent in viscosity properties (viscosity index) and low-temperature fluidity.SOLUTION: The lubricant composition includes an α-olefin polymer satisfying (1) to (3) mentioned below, and mineral oil classified in any of groups 1-3 in the API(American Petroleum Institute) base oil category, and has a pour point of -30°C or lower and a viscosity index of 110 or more. (1) The kinetic viscosity at 100°C is 20-200 mm/s. (2) The number average molecular weight (Mn) is 1,000-9,000. (3) The viscosity index (VI) is 160 or more.

Description

  The present invention relates to a lubricating oil composition.

  The properties that have been demanded of lubricating oils for automobiles and industrial machinery so far include a relatively high viscosity from the viewpoint of lubrication performance. There is a need for lower fuel consumption, energy saving, and longer life, and there is a demand for synthetic lubricating oils with superior viscosity characteristics (viscosity index), etc., compared to poly α-olefins that have been used in the past. Yes.

  As such examples, Patent Documents 1 to 3 disclose lubricating oil compositions using an α-olefin polymer having a very high viscosity index obtained using a metallocene complex as a base oil.

JP 2011-195734 A Special table 2008-530268 Special table 2005-519184

However, when an α-olefin polymer having a large molecular weight is used in order to obtain a lubricating oil composition having a higher viscosity and a higher viscosity index, there is a problem that the viscosity in a low temperature region such as −20 to −30 ° C. increases. there were.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lubricating oil composition that is excellent in low-temperature fluidity and can realize a high viscosity index.

As a result of intensive research, the inventors have a kinematic viscosity at 100 ° C. of 20 to 200 mm ² / s, a number average molecular weight (Mn) of 1,000 to 6,000, and a viscosity index (VI) of 160 or more. A lubricating oil composition having a pour point of −30 ° C. or lower and a viscosity index of 110 or higher by using together the α-olefin polymer of the above and a base oil classified into groups 1 to 3 in the API category. It has been found that the above-mentioned problems can be solved if manufactured. The present invention has been completed based on such findings.
That is, the present invention provides the following.
1. It contains an α-olefin polymer satisfying the following (1) to (3) and a mineral oil classified into any of groups 1 to 3 in the API (American Petroleum Institute) base oil category, and the pour point is −30 ° C. A lubricating oil composition having a viscosity index of 110 or more.
(1) The 100 ° C. kinematic viscosity is 20 to 200 mm ² / s.
(2) The number average molecular weight (Mn) is 1,000 to 9,000.
(3) The viscosity index (VI) is 160 or more.
2. 2. The lubricating oil composition according to 1 above, wherein the α-olefin polymer is synthesized using a metallocene catalyst and satisfies the following (a) and (b).
(A) The proportion of polymerization ends measured by ¹ H-NMR being 2,1 insertion is 30 mol% or more of all molecules.
(B) Mesotriad fraction (mm) measured by ¹³ C-NMR is 50 mol% or less.
3. 3. The lubricating oil composition according to 1 or 2 above, wherein the α-olefin polymer has an average number of short chain branches per molecule of 1.3 or less as measured by ¹³ C-NMR.
4). 4. The lubricating oil composition according to any one of 1 to 3, wherein the α-olefin polymer is a 1-octene / 1-dodecene copolymer.
5. The lubricating oil composition according to any one of 1 to 4 above, wherein the α-olefin polymer has a weight average molecular weight (Mw) measured by GPC of 200 to 30,000.
6). 5. The lubricating oil composition as described in 4 above, wherein the α-olefin polymer is synthesized using a metallocene catalyst and satisfies the following (b) and (c).
(B) Mesotriad fraction (mm) measured by ¹³ C-NMR is 50 mol% or less.
(C) The ratio of 1-octene unit to 1-dodecene unit is 20:80 to 80:20 in molar ratio.
7). Furthermore, the lubricating oil composition in any one of said 1-6 containing 1 or more types selected from ester, alkyl naphthalene, and alkylbenzene.
8). The lubricating oil composition according to any one of 1 to 7 above, which has a pour point of -33 ° C or lower.
9. The lubricating oil composition according to any one of 1 to 8 above, wherein the viscosity index is 135 or more.
10. 10. The lubricating oil composition according to any one of 1 to 9 above, wherein the α-olefin polymer has a 100 ° C. kinematic viscosity of 40 to 160 mm ² / s.
11. The lubricating oil composition according to any one of 1 to 10 above, wherein the α-olefin polymer has a number average molecular weight (Mn) of 2,500 to 7,500.
12 The lubricating oil composition according to any one of 1 to 11 above, wherein the α-olefin polymer has a viscosity index of 170 or more.

  According to the present invention, it is possible to provide a lubricating oil composition that is excellent in low-temperature fluidity and can realize a high viscosity index.

The lubricating oil composition of the present invention contains an α-olefin polymer described below and mineral oil, has a pour point of −30 ° C. or lower and a viscosity index of 110 or higher, and is described above. As described above, the low-temperature fluidity and the high viscosity index are both compatible, but preferably the oxidation stability is further improved and the viscosity is high.
Furthermore, the lubricating oil composition of the present invention preferably has a pour point of −33 ° C. or lower, more preferably −40 ° C. or lower, and more preferably a viscosity index of 135 or higher.

[Α-olefin polymer]
The α-olefin polymer satisfies the following (1) to (3), and preferably satisfies the following (4) and (5). The α-olefin polymer may be a hydrogenated product.
(1) The 100 ° C. kinematic viscosity is 20 to 200 mm ² / s.
(2) The number average molecular weight (Mn) is 1,000 to 9,000.
(3) The viscosity index (VI) is 160 or more.
(4) The weight average molecular weight (Mw) is 2,000 to 30,000.
(5) Molecular weight distribution (Mw / Mn) is 3.0 or less.
The number average molecular weight (Mn), the weight average molecular weight (Mw) and the molecular weight distribution (Mw / Mn) are all polystyrene-converted values measured using a gel permeation chromatography method (GPC).

The α-olefin polymer has a number average molecular weight (Mn) of 1,000 to 9,000 from the viewpoint of device life and energy saving when used in industrial gear oil such as wind power generators and automobile gear oil. Preferably, it is 1,500-8,000, More preferably, it is 2,500-7,500.
The α-olefin polymer preferably has a weight average molecular weight (Mw) of 2,000 to 30,000, more preferably 2,500 to 20,000, for the same reason. More preferably, it is 000-15,000.
Furthermore, the α-olefin polymer preferably has a molecular weight distribution (Mw / Mn) of 3.0 or less, more preferably 2.0 or less, and further preferably 1.3 to 2.0. preferable. When the molecular weight distribution (Mw / Mn) is 3.0 or less, the high molecular weight component is reduced to improve shear stability, and the low molecular weight component is reduced to reduce volatility.

α- olefin polymer, it 100 ° C. kinematic viscosity measured in accordance with JIS K2283 is 20 to 200 mm ² / s, is preferably 30~180mm ² / s, a 40~160mm ² / s Is more preferable. When 100 ° C. kinematic viscosity is less than 20 mm ² / s, and durability when used as a high-viscosity lubricating oil component is insufficient, the 100 ° C. kinematic viscosity is 200 mm ² / s greater than the viscosity is too high As a result, energy savings will be insufficient.

  The α-olefin polymer can be synthesized using a metallocene catalyst. By copolymerizing the monomer using a metallocene catalyst, a polymer having a high viscosity index can be obtained, and since the metallocene catalyst is used, the polymerization terminal tends to be a 2,1 insertion terminal, and the polymer chain has few tertiary carbons. Is excellent in oxidation stability.

As the raw material monomer (α-olefin) for producing the α-olefin polymer, one or more α-olefins having 6 to 20 carbon atoms are usually used. Examples of the α-olefin having 6 to 20 carbon atoms include 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, Examples include 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene and the like, and one or more of these are used. Among them, those having 6 to 14 carbon atoms, which are easily available and inexpensive, are more preferable, and those having 8 to 12 carbon atoms are particularly preferable.
The α-olefin polymer used in the present invention is preferably a 1-octene / 1-dodecene copolymer, and the ratio of 1-octene units to 1-dodecene units is 20:80 to 80:20 in molar ratio. Preferably, 30:70 to 70:30 is more preferable, and 40:60 to 60:40 is particularly preferable.

From the viewpoint of low temperature characteristics (low temperature fluidity), the α-olefin polymer preferably has a mesotriad fraction (mm) measured by ¹³ C-NMR of 50 mol% or less, and is preferably 25 to 50 mol%. More preferably, it is more preferably 30 to 40 mol%, and particularly preferably 31 to 37 mol%.

  The α-olefin polymer used in the present invention has a higher viscosity index (VI) than the conventional one. Specifically, the viscosity index (VI) needs to be 160 or more, preferably 165 or more, and more preferably 170 or more.

  In the polymerization step of the α-olefin polymer, (A) a metallocene compound is used as a polymerization catalyst, and in addition to the metallocene compound, (B) (b-1) an organoaluminum oxy compound, (b-2) a reaction with the above metallocene compound. Thus, an ionic compound that can be converted into a cation, or (C) an organoaluminum compound can be used. Metallocene compounds and other polymerization catalysts are referred to as “polymerization catalysts”.

  As said (A) metallocene compound, what is represented by the following general formula (I)-(IV) is used.

^{(C 1) (C 2)} M 1 X 1 X 2 Y 1 a Y 2 b (I)
(Wherein M ¹ represents titanium, zirconium or hafnium, C ¹ and C ² each independently represents a cyclopentadienyl group or an indenyl group or an alkyl substituent thereof, and C ¹ and C ² are the same as each other) X ¹ and X ² each independently represents a σ-binding ligand or a chelating ligand, and X ¹ and X ² may be the same or different from each other. Y ¹ and Y ² each independently represent a Lewis base, and Y ¹ and Y ² may be the same or different from each other, and a and b each independently represent 0 or 1.)

（式中、Ｍ²はチタン、ジルコニウム又はハフニウムであり、Ｃ³及びＣ⁴は、それぞれ独立に、シクロペンタジエニル基又はインデニル基あるいはそれらのアルキル置換体を表し、Ｃ³及びＣ⁴は互いに同じでも異なっていてもよい。また、Ｘ³、Ｘ⁴は、それぞれ独立に、σ結合性配位子又はキレート性配位子を表し、Ｘ³及びＸ⁴は互いに同じでも異なっていてもよい。Ｙ³、Ｙ⁴はルイス塩基、ｃ及びｄは、それぞれ独立に、０又は１を表し、Ｙ¹及びＹ²は互いに同じでも異なっていてもよい。Ａは架橋基であり、−Ｒ₂Ｃ−又は−Ｒ₂Ｓｉ−を表し、Ｒは、それぞれ独立に、水素原子又は炭化水素基を表す。）

(Wherein M ² is titanium, zirconium or hafnium, C ³ and C ⁴ each independently represent a cyclopentadienyl group or an indenyl group or an alkyl substituent thereof, and C ³ and C ⁴ are X ³ and X ⁴ each independently represents a σ-binding ligand or a chelating ligand, and X ³ and X ⁴ may be the same or different from each other. Y ³ and Y ⁴ are Lewis bases, c and d each independently represent 0 or 1, Y ¹ and Y ² may be the same or different from each other, A is a bridging group, and —R ₂ C— or —R ₂ Si— is represented, and each R independently represents a hydrogen atom or a hydrocarbon group.)

（式中、Ｒ¹〜Ｒ⁶は、それぞれ独立に、水素原子、ハロゲン原子、炭素数１〜２０、好ましくは炭素数１〜１０、より好ましくは炭素数１〜４の炭化水素基（例えばアルキル基）、又はハロゲン原子、ケイ素原子、酸素原子、イオウ原子、窒素原子及びリン原子から選ばれる一種以上の原子を含有する炭素数１〜２０の有機基を示す。Ｒ¹〜Ｒ³から選ばれる少なくとも１つが水素原子であり、Ｒ⁴〜Ｒ⁶から選ばれる少なくとも１つが水素原子である。Ｒ^a、Ｒ^bは、それぞれ独立に、下記一般式（ａ）で表される連結基である。Ｘ¹及びＸ²は、それぞれ独立に、水素原子、ハロゲン原子、炭素数１〜２０の炭化水素基、又はハロゲン原子、ケイ素原子、酸素原子、イオウ原子、窒素原子及びリン原子から選ばれる一種以上の原子を含有する炭素数１〜２０の有機基を示す。Ｍは周期表第４〜６族の遷移金属を示す。）

(In the formula, R ^{1 to} R ⁶ each independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, preferably 1 to 10 carbon atoms, more preferably 1 to 4 carbon atoms (for example, an alkyl group) Group), or an organic group having 1 to 20 carbon atoms containing one or more atoms selected from a halogen atom, a silicon atom, an oxygen atom, a sulfur atom, a nitrogen atom and a phosphorus atom, selected from R ^{1 to} R ^3. At least one is a hydrogen atom, and at least one selected from R ^{4 to} R ⁶ is a hydrogen atom, and R ^a and R ^b are each independently a linking group represented by the following general formula (a). X ¹ and X ² are each independently one or more selected from a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, or a halogen atom, a silicon atom, an oxygen atom, a sulfur atom, a nitrogen atom, and a phosphorus atom. Containing atoms .M showing an organic group having 1 to 20 carbon atoms show a 4-6 transition metals of the periodic table.)

（式中、ｎは１〜３の整数である。Ｒ⁷及びＲ⁸は、それぞれ独立に、水素原子、ハロゲン原子、炭素数１〜２０の炭化水素基、又は炭素数１〜２０のハロゲン含有炭化水素基を示し、好ましくは水素原子又は炭素数１〜４の炭化水素基、より好ましくは水素原子又は炭素数１〜４のアルキル基である。Ｂは周期表第１４族の原子を示す。
Ｒ^a及びＲ^bの好ましい例としては、−ＣＲ⁷Ｒ⁸−、−ＳｉＲ⁷Ｒ⁸−、−ＣＲ⁷Ｒ⁸−ＣＲ⁷Ｒ⁸−、及び−ＳｉＲ⁷Ｒ⁸−ＳｉＲ⁷Ｒ⁸−が挙げられる。

(In the formula, n is an integer of 1 to 3. R ⁷ and R ⁸ each independently contains a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, or a halogen atom having 1 to 20 carbon atoms. Represents a hydrocarbon group, preferably a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms, more preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and B represents an atom of Group 14 of the periodic table.
Preferred examples of R ^a and R ^{b, -CR 7 R 8 -, -} SiR 7 R 8 -, - CR 7 R 8 -CR 7 R 8 -, and ^{-SiR 7 R 8 -SiR 7 R 8} - is Can be mentioned.

（式中、Ｒ⁹〜Ｒ¹⁸及びＸ¹、Ｘ²は、それぞれ独立に、水素原子、ハロゲン原子、炭素数１〜２０の炭化水素基、好ましくは炭素数１〜１０、より好ましくは炭素数１〜４の炭化水素基（例えばアルキル基）、炭素数１〜２０のハロゲン含有炭化水素基、ケイ素含有基、酸素含有基、イオウ含有基、窒素含有基又はリン含有基を示し、隣接する基と互いに結合して環を形成してもよい。Ｒ^c、Ｒ^dは、それぞれ独立に、二つの配位子を結合する二価の基であって、炭素数１〜２０、好ましくは炭素数１〜１０、より好ましくは炭素数１〜４の２価の炭化水素基、炭素数１〜２０の２価のハロゲン含有炭化水素基、２価のケイ素含有基、２価のゲルマニウム含有基、２価の錫含有基、−Ｏ−、−ＣＯ−、−Ｓ−、−ＳＯ₂−、−ＮＲ¹⁹−、−ＰＲ¹⁹−、−Ｐ（Ｏ）Ｒ¹⁹−、−ＢＲ¹⁹−又は−ＡｌＲ¹⁹−を示し、Ｒ¹⁹は水素原子、ハロゲン原子、炭素数１〜２０の炭化水素基、又は炭素数１〜２０のハロゲン含有炭化水素基を示す。Ｍは周期律表第４〜６族の遷移金属を示す。）

(In formula, R < ⁹ > -R < ¹⁸ > and X < ¹ >, X < ² > are respectively independently a hydrogen atom, a halogen atom, a C1-C20 hydrocarbon group, Preferably it is C1-C10, More preferably, it is carbon number. 1 to 4 hydrocarbon groups (for example, alkyl groups), halogen-containing hydrocarbon groups having 1 to 20 carbon atoms, silicon-containing groups, oxygen-containing groups, sulfur-containing groups, nitrogen-containing groups or phosphorus-containing groups, adjacent groups May be bonded to each other to form a ring, and R ^c and R ^d are each independently a divalent group that binds two ligands and has 1 to 20 carbon atoms, preferably carbon atoms. 1 to 10, more preferably a divalent hydrocarbon group having 1 to 4 carbon atoms, a divalent halogen-containing hydrocarbon group having 1 to 20 carbon atoms, a divalent silicon-containing group, a divalent germanium-containing group, 2 valent tin-containing group, -O -, - CO -, - S -, - SO 2 -, - NR 19 -, - ^{R 19 -, - P (O} ) R 19 -, - BR 19 - or -AlR ¹⁹ - are shown, R ¹⁹ is a hydrogen atom, a halogen atom, a hydrocarbon group having 1-20 carbon atoms, or 1 to 20 carbon atoms (M represents a transition metal of Groups 4 to 6 in the periodic table.)

  Specific examples of the metallocene compound represented by the general formula (I) include bis (cyclopentadienyl) zirconium dichloride, bis (methylcyclopentadienyl) zirconium dichloride, bis (ethylcyclopentadienyl) zirconium dichloride, Bis (isopropylcyclopentadienyl) zirconium dichloride, bis (n-propylcyclopentadienyl) zirconium dichloride, bis (n-butylcyclopentadienyl) zirconium dichloride, bis (t-butylcyclopentadienyl) zirconium dichloride, Bis (hexylcyclopentadienyl) zirconium dichloride, bis (trimethylsilylcyclopentadienyl) zirconium dichloride, bis (trimethylsilylmethylcyclopentadienyl) zirconi Mudichloride, bis (cyclopentadienyl) zirconium chlorohydride, bis (cyclopentadienyl) methylzirconium chloride, bis (cyclopentadienyl) ethylzirconium chloride, bis (cyclopentadienyl) methoxyzirconium chloride, bis (cyclopenta Dienyl) phenylzirconium chloride, bis (cyclopentadienyl) dimethylzirconium, bis (cyclopentadienyl) diphenylzirconium, bis (cyclopentadienyl) dineopentylzirconium, bis (cyclopentadienyl) dihydrozirconium, bis (Cyclopentadienyl) dimethoxyzirconium, and further, in the compounds described above, the chlorine atom of these compounds is substituted with a bromine atom, an iodine atom, a hydrogen atom, a methyl group, Replaced with a cycloalkenyl group, and may include those obtained by replacing the zirconium metal centers of the compounds titanium, hafnium.

  Specific examples of the metallocene compound represented by the general formula (II) include ethylene-bis (cyclopentadienyl) hafnium dichloride, ethylene-bis (cyclopentadienyl) zirconium dichloride, and methylene-bis (cyclopentadienyl). ) Hafnium dichloride, methylene-bis (cyclopentadienyl) zirconium dichloride, isopropylidene-bis (cyclopentadienyl) hafnium dichloride, isopropylidene-bis (cyclopentadienyl) zirconium dichloride, dimethylsilylene-bis (cyclopentadi) Enyl) hafnium dichloride, dimethylsilylene-bis (cyclopentadienyl) zirconium dichloride, and the like.

  Specific examples of the metallocene compound represented by the general formula (III) include (1,1′-ethylene) (2,2′-ethylene) biscyclopentadienylzirconium dichloride, (1,1′-ethylene). (2,2′-ethylene) bis (3-methylcyclopentadienyl) zirconium dichloride, (1,1′-ethylene) (2,2′-ethylene) bis (4-methylcyclopentadienyl) zirconium dichloride, (1,1′-ethylene) (2,2′-ethylene) bis (3,4-dimethylcyclopentadienyl) zirconium dichloride, (1,1′-ethylene) (2,2′-ethylene) bis (3 , 5-Dimethylcyclopentadienyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-dimethylsilylene) biscyclopen Dienylzirconium dichloride, (1,1′-dimethylsilylene) (2,2′-dimethylsilylene) bis (3-methylcyclopentadienyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2 ′ -Dimethylsilylene) bis (4-methylcyclopentadienyl) zirconium dichloride, (1,1'-dimethylsilylene) (2,2'-dimethylsilylene) bis (3,4-dimethylcyclopentadienyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-dimethylsilylene) bis (3,5-dimethylcyclopentadienyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-ethylene) Biscyclopentadienylzirconium dichloride, (1,1′-dimethylsilylene) ( , 2′-ethylene) bis (3-methylcyclopentadienyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-ethylene) bis (4-methylcyclopentadienyl) zirconium dichloride, ( 1,1′-dimethylsilylene) (2,2′-ethylene) bis (3,4-dimethylcyclopentadienyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-ethylene) bis ( 3,5-dimethylcyclopentadienyl) zirconium dichloride, (1,1′-isopropylidene) (2,2′-dimethylsilylene) biscyclopentadienylzirconium dichloride, (1,1′-isopropylidene) (2 , 2′-dimethylsilylene) bis (3-methylcyclopentadienyl) zirconium dichloride, ( 1,1′-isopropylidene) (2,2′-dimethylsilylene) bis (4-methylcyclopentadienyl) zirconium dichloride, (1,1′-isopropylidene) (2,2′-dimethylsilylene) bis ( 3,4-dimethylcyclopentadienyl) zirconium dichloride, (1,1′-isopropylidene) (2,2′-dimethylsilylene) bis (3,5-dimethylcyclopentadienyl) zirconium dichloride, (1,1 '-Isopropylidene) (2,2'-isopropylidene) bis (3-methylcyclopentadienyl) zirconium dichloride, (1,1'-isopropylidene) (2,2'-isopropylidene) bis (4-methyl) Cyclopentadienyl) zirconium dichloride, (1,1′-isopropylidene) (2,2′-iso (Ropyridene) bis (3,4-dimethylcyclopentadienyl) zirconium dichloride, (1,1′-isopropylidene) (2,2′-isopropylidene) bis (3,5-dimethylcyclopentadienyl) zirconium dichloride, etc. And dimethyl, diethyl, dihydro, diphenyl, dibenzyl and the like, and their titanium and hafnium complexes.

  Examples of the compound represented by the general formula (IV) include (1,1′-ethylene) (2,2′-ethylene) bisindenylzirconium dichloride, (1,1′-ethylene) (2,2 '-Ethylene) bis (3-methylindenyl) zirconium dichloride, (1,1'-ethylene) (2,2'-ethylene) bis (4-methylindenyl) zirconium dichloride, (1,1'-ethylene) (2,2′-ethylene) bis (5-methylindenyl) zirconium dichloride, (1,1′-ethylene) (2,2′-ethylene) bis (5,6-benzoindenyl) zirconium dichloride, (1 , 1′-ethylene) (2,2′-ethylene) bis (4,5-benzoindenyl) zirconium dichloride, (1,1′-ethylene) (2,2′-ethylene) (5,6-dimethylindenyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-dimethylsilylene) bisindenylzirconium dichloride, (1,1′-dimethylsilylene) (2,2 '-Dimethylsilylene) bis (3-methylindenyl) zirconium dichloride, (1,1'-dimethylsilylene) (2,2'-dimethylsilylene) bis (4-methylindenyl) zirconium dichloride, (1,1' -Dimethylsilylene) (2,2'-dimethylsilylene) bis (5-methylindenyl) zirconium dichloride, (1,1'-dimethylsilylene) (2,2'-dimethylsilylene) bis (5,6-benzoindene Nyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-dimethylsilylene) Bis (4,5-benzoindenyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-dimethylsilylene) bis (5,6-dimethylindenyl) zirconium dichloride, (1,1′- Dimethylsilylene) (2,2′-ethylene) bisindenylzirconium dichloride, (1,1′-dimethylsilylene) (2,2′-ethylene) bis (3-methylindenyl) zirconium dichloride, (1,1 ′ -Dimethylsilylene) (2,2'-ethylene) bis (4-methylindenyl) zirconium dichloride, (1,1'-dimethylsilylene) (2,2'-ethylene) bis (5-methylindenyl) zirconium dichloride , (1,1′-dimethylsilylene) (2,2′-ethylene) bis (5,6-benzoindenyl) zirco Nium dichloride, (1,1′-dimethylsilylene) (2,2′-ethylene) bis (4,5-benzoindenyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-ethylene) Bis (5,6-dimethylindenyl) zirconium dichloride, (1,1′-ethylene) (2,2′-dimethylsilylene) bisindenylzirconium dichloride, (1,1′-ethylene) (2,2′- Dimethylsilylene) bis (3-methylindenyl) zirconium dichloride, (1,1′-ethylene) (2,2′-dimethylsilylene) bis (4-methylindenyl) zirconium dichloride, (1,1′-ethylene) (2,2′-dimethylsilylene) bis (5-methylindenyl) zirconium dichloride, (1,1′-ethylene) (2, '-Dimethylsilylene) bis (5,6-benzoindenyl) zirconium dichloride, (1,1'-ethylene) (2,2'-dimethylsilylene) bis (4,5-benzoindenyl) zirconium dichloride, (1 , 1′-ethylene) (2,2′-dimethylsilylene) bis (5,6-dimethylindenyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-isopropylidene) bisindenylzirconium Dichloride, (1,1′-dimethylsilylene) (2,2′-isopropylidene) bis (3-methylindenyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-isopropylidene) bis (4-Methylindenyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-iso (Ropyridene) bis (5-methylindenyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-isopropylidene) bis (5,6-benzoindenyl) zirconium dichloride, (1,1′- Dimethylsilylene) (2,2′-isopropylidene) bis (4,5-benzoindenyl) zirconium dichloride, (1,1′-dimethylsilylene) (2,2′-isopropylidene) bis (5,6-dimethyl) Examples thereof include dichloro isomers such as indenyl) zirconium dichloride and dimethyl, diethyl, dihydro, diphenyl, and dibenzyl isomers of the above compounds, and titanium and hafnium complexes thereof.

  As the metallocene compound used as the component (A), one kind may be used, or two or more kinds may be used in combination.

  Examples of the (b-1) organoaluminum oxy compound include a chain aluminoxane represented by the following general formula (V) and a cyclic aluminoxane represented by the following general formula (VI).

（一般式（Ｖ）及び（ＶＩ）において、Ｒ²⁰〜Ｒ²⁵は、それぞれ独立に、炭素数１〜２０、好ましくは１〜１２の炭化水素基又はハロゲン原子を示す。当該炭化水素基としては、アルキル基，アルケニル基，アリール基，アリールアルキル基等が挙げられる。ｎは重合度を示し、通常２〜５０、好ましくは２〜４０の整数である。尚、各Ｒ²⁰〜Ｒ²⁵は互いに同じでも異なっていてもよい。）

(In the general formulas (V) and (VI), R ^{20 to} R ²⁵ each independently represents a hydrocarbon group or a halogen atom having 1 to 20, preferably 1 to 12 carbon atoms. , alkyl group, alkenyl group, aryl group, .n where arylalkyl group, etc. represents a polymerization degree, usually 2 to 50, preferably 2 to 40 integer. Note that each R ²⁰ to R ²⁵ are each Same or different.)

  Specific examples of the aluminoxane include methylaluminoxane, ethylaluminoxane, isobutylaluminoxane and the like.

  Examples of the method for producing the aluminoxane include a method in which an alkylaluminum is brought into contact with a condensing agent such as water, but the means is not particularly limited and may be reacted according to a known method. For example, a method in which an organoaluminum compound is dissolved in an organic solvent and brought into contact with water, a method in which an organoaluminum compound is initially added at the time of polymerization, and water is added later, a crystal water contained in a metal salt or the like There are a method of reacting water adsorbed on an inorganic or organic material with an organoaluminum compound, a method of reacting a tetraalkyldialuminoxane with a trialkylaluminum, and a reaction with water. The aluminoxane may be insoluble in toluene. These aluminoxanes may be used alone or in combination of two or more.

On the other hand, as the component (b-2), any ionic compound that can be converted into a cation by reacting with the metallocene compound of the component (A) can be used, but the following general formula (VII) , (VIII) can be preferably used.
([L ¹ −R ²⁶ ] ^{k +} ) _a ([Z] ⁻ ) _b (VII)
([L ² ] ^{k +} ) _a ([Z] ⁻ ) _b (VIII)

In General Formula (VII), L ¹ represents a Lewis base, R ²⁶ represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or a carbon number of 6 to 20 selected from an aryl group, an alkylaryl group, and an arylalkyl group. Represents a hydrocarbon group.

Here, specific examples of L ¹ include ammonia, methylamine, aniline, dimethylamine, diethylamine, N-methylaniline, diphenylamine, N, N-dimethylaniline, trimethylamine, triethylamine, tri-n-butylamine, methyldiphenylamine, Amines such as pyridine, p-bromo-N, N-dimethylaniline, p-nitro-N, N-dimethylaniline, phosphines such as triethylphosphine, triphenylphosphine, diphenylphosphine, thioethers such as tetrahydrothiophene, benzoic acid Examples thereof include esters such as ethyl acid, and nitriles such as acetonitrile and benzonitrile. Specific examples of R ²⁶ include a hydrogen atom, a methyl group, an ethyl group, a benzyl group, and a trityl group.

In the general formula (VIII), L ² represents M ¹ , R ²⁷ R ²⁸ M ² , R ²⁹ C or R ³⁰ M ² . R ²⁷ and R ²⁸ each independently represent a cyclopentadienyl group, a substituted cyclopentadienyl group, an indenyl group or a fluorenyl group, and R ²⁹ represents an alkyl group having 1 to 20 carbon atoms, an aryl group, an alkyl group A hydrocarbon group having 6 to 20 carbon atoms selected from an aryl group and an arylalkyl group is shown. R ³⁰ represents a macrocyclic ligand such as tetraphenylporphyrin or phthalocyanine.
M ¹ includes elements of Group ¹ to 3, 11 to 13 and 17 of the periodic table, and M ² represents elements of Group 7 to 12 of the periodic table.

Here, specific examples of R ²⁷ and R ²⁸ include a cyclopentadienyl group, a methylcyclopentadienyl group, an ethylcyclopentadienyl group, a pentamethylcyclopentadienyl group, and the like. Specific examples of R ²⁹ include a phenyl group, p-tolyl group, p-methoxyphenyl group, and the like. Specific examples of R ³⁰ include tetraphenylporphyrin, phthalocyanine, and the like. Further, specific examples of M ¹ include Li, Na, K, Ag, Cu, Br, I, I _{3 and the} like. Specific examples of M ² include Mn, Fe, Co, Ni, Zn. Etc.

In the general formulas (VII) and (VIII), k is an ion valence of [L ¹ -R ²⁶ ], [L ² ], an integer of 1 to 3, a is an integer of 1 or more, b = (k × a) It is.
[Z] ⁻ represents a non-coordinating anion [Z ¹ ] ⁻ or [Z ² ] ⁻ .
[Z ¹ ] ⁻ represents an anion having a plurality of groups bonded to the element, that is, [M ³ G ¹ G ² ... G ^f ] ⁻ . Here, M ³ represents a periodic table group 5-15 element, preferably a periodic table group 13-15 element. G ^{1 to} G ^f are each a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, a dialkylamino group having 2 to 40 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, An aryloxy group having 6 to 20 carbon atoms, an alkylaryl group having 7 to 40 carbon atoms, an arylalkyl group having 7 to 40 carbon atoms, a halogen-substituted hydrocarbon group having 1 to 20 carbon atoms, and an acyloxy group having 1 to 20 carbon atoms Or an organic metalloid group or a C2-C20 heteroatom containing hydrocarbon group is shown. Two or more of G ^{1 to} G ^f may form a ring. f represents an integer of [(valence of central metal M ³ ) +1].
[Z ² ] ⁻ is a Bronsted acid alone having a logarithm (pKa) of the reciprocal of the acid dissociation constant or a conjugate base of a combination of Bronsted acid and Lewis acid, or an acid generally defined as a super strong acid. Conjugated base is shown. In addition, a Lewis base may be coordinated.

Here, in [Z ¹ ] ⁻ , that is, [M ³ G ¹ G ² ... G ^f ] ⁻ , specific examples of M ³ include B, Al, Si, P, As, Sb, etc., preferably B And Al. Specific examples of G ¹ and G ^{2 to} G ^f include a dimethylamino group and a diethylamino group as a dialkylamino group, a methoxy group, an ethoxy group, an n-propoxy group, a phenoxy group and the like as an alkoxy group or an aryloxy group. As hydrocarbon groups, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, n-octyl group, n-eicosyl group, phenyl group, p-tolyl group, benzyl group, 4 -T-butylphenyl group, 3,5-dimethylphenyl group, etc., as halogen atom, fluorine, chlorine, bromine, iodine, hetero atom-containing hydrocarbon group, p-fluorophenyl group, 3,5-difluorophenyl group, Pentachlorophenyl group, 3,4,5-trifluorophenyl group, pentafluorophenyl group, 3,5-bis (trifluoro Oromechiru) phenyl group, bis (trimethylsilyl) methyl group or the like, an organic metalloid group include pentamethyl antimony group, a trimethylsilyl group, trimethylgermyl group, diphenylarsine group, dicyclohexyl antimony group, a diphenyl borate containing group or the like.

Specific examples of the non-coordinating anion, that is, a conjugated base [Z ² ] ⁻ of Bronsted acid alone or a combination of Bronsted acid and Lewis acid having a pKa of −10 or less include a trifluoromethanesulfonate anion (CF ₃ SO ₃ ) ⁻ , bis (trifluoromethanesulfonyl) methyl anion, bis (trifluoromethanesulfonyl) benzyl anion, bis (trifluoromethanesulfonyl) amide, perchlorate anion (ClO ₄ ) ⁻ , trifluoroacetate anion (CF ₃ COO ) ⁻ , Hexafluoroantimony anion (SbF ₆ ) ⁻ , fluorosulfonate anion (FSO ₃ ) ⁻ , chlorosulfonate anion (ClSO ₃ ) ⁻ , fluorosulfonate anion / 5-antimony fluoride (FSO ₃ / SbF ₅ ) ^-, fluorosulfonic acid anion / 5 Fluoride Arsenic ^{_{(FSO 3 / AsF 5) -}} , trifluoromethanesulfonic acid / antimony pentafluoride _{(CF 3 SO 3 / SbF 5} ) - , and the like.

  Specific examples of such (b-2) component compounds include triethylammonium tetraphenylborate, tri-n-butylammonium tetraphenylborate, trimethylammonium tetraphenylborate, tetraethylammonium tetraphenylborate, tetraphenyl Methyl (tri-n-butyl) ammonium borate, benzyl (tri-n-butyl) ammonium tetraphenylborate, dimethyldiphenylammonium tetraphenylborate, triphenyl (methyl) ammonium tetraphenylborate, trimethyltetraphenylborate Anilinium, methylpyridinium tetraphenylborate, benzylpyridinium tetraphenylborate, methyl tetraphenylborate (2-cyanopyridinium), tetrakis (pentafluoro Phenyl) triethylammonium borate, tetrakis (pentafluorophenyl) tri-n-butylammonium borate, tetrakis (pentafluorophenyl) triphenylammonium borate, tetrakis (pentafluorophenyl) tetra-n-butylammonium borate, tetrakis (Pentafluorophenyl) tetraethylammonium borate, tetrakis (pentafluorophenyl) benzyl benzyl (tri-n-butyl) borate, methyldiphenylammonium tetrakis (pentafluorophenyl) borate, triphenyl tetrakis (pentafluorophenyl) borate (Methyl) ammonium, tetrakis (pentafluorophenyl) methylanilinium borate, tetrakis (pentafluorophenyl) borate dimethyl Ruanilinium, trimethylanilinium tetrakis (pentafluorophenyl) borate, methylpyridinium tetrakis (pentafluorophenyl) borate, benzylpyridinium tetrakis (pentafluorophenyl) borate, methyl tetrakis (pentafluorophenyl) borate (2-cyanopyridinium ), Benzyl tetrakis (pentafluorophenyl) borate (2-cyanopyridinium), methyl tetrakis (pentafluorophenyl) borate (4-cyanopyridinium), triphenylphosphonium tetrakis (pentafluorophenyl) borate, tetrakis [bis ( 3,5-ditrifluoromethyl) phenyl] dimethylanilinium borate, ferrocenium tetraphenylborate, silver tetraphenylborate, tetraphenyl Trityl borate, tetraphenylporphyrin manganese tetraphenylborate, ferrocenium tetrakis (pentafluorophenyl) borate, tetrakis (pentafluorophenyl) borate (1,1'-dimethylferrocenium), tetrakis (pentafluorophenyl) boron Decamethylferrocenium acid, silver tetrakis (pentafluorophenyl) borate, trityl tetrakis (pentafluorophenyl) triborate, lithium tetrakis (pentafluorophenyl) borate, sodium tetrakis (pentafluorophenyl) borate, tetrakis (penta Fluorophenyl) manganese tetraphenylporphyrin borate, silver tetrafluoroborate, silver hexafluorophosphate, silver hexafluoroarsenate, silver perchlorate, silver trifluoroacetate, silver Trifluoromethanesulfonate and silver, and the like.

  This (b-2) component may be used alone or in combination of two or more. In the present invention, when the component (B) is used, the use ratio of the component (A) and the component (B) is preferably a molar ratio when the component (b-1) is used as the component (B). Is 1: 1 to 1: 1,000,000, more preferably 1:10 to 1: 10,000, and when the component (b-2) is used, the molar ratio is preferably 10: 1 to 1. : 100, more preferably 2: 1 to 1:10. Moreover, as (B) component, (b-1), (b-2), etc. can also be used individually or in combination of 2 or more types.

The catalyst in the present invention may contain the above-mentioned components (A) and (B) as the main components, and (A) component, (B) component and (C) organoaluminum compound. May be contained as a main component. Here, as the organoaluminum compound of the component (C), the general formula (IX)
(R ³¹ ) _v AlQ _3-v (IX)
(In the formula, R ³¹ represents an alkyl group having 1 to 10 carbon atoms, Q represents a hydrogen atom, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or a halogen atom, and v represents 1 to 3 carbon atoms. Which is an integer).

  Specific examples of the compound represented by the general formula (IX) include trimethylaluminum, triethylaluminum, triisopropylaluminum, triisobutylaluminum, dimethylaluminum chloride, diethylaluminum chloride, methylaluminum dichloride, ethylaluminum dichloride, dimethylaluminum fluoride. , Diisobutylaluminum hydride, diethylaluminum hydride, ethylaluminum sesquichloride and the like. These organoaluminum compounds may be used singly or in combination of two or more. The use ratio of the component (A) to the component (C) is a molar ratio, preferably 1: 1 to 1: 10,000, more preferably 1: 5 to 1: 2,000, and still more preferably 1: 10 to 1: 1,000. By using this component (C), the activity per transition metal can be improved, but if it is too much, the organoaluminum compound is wasted and a large amount remains in the α-olefin polymer, which is not preferable.

In the present invention, the polymerization method is not particularly limited, and any method such as a bulk polymerization method, a solution polymerization method, a suspension polymerization method, a slurry polymerization method, and a gas phase polymerization method may be used.
About polymerization conditions, superposition | polymerization temperature is 0-200 degreeC normally, Preferably it is 30-150 degreeC, More preferably, it is 40-120 degreeC. The ratio of the catalyst to the raw material monomer is preferably 1 to 10 ⁸ , particularly preferably 100 to 10 ⁵ , based on the raw material monomer / the component (A) (molar ratio). Furthermore, the polymerization time is usually 5 minutes to 20 hours, and the reaction pressure is preferably normal pressure to 0.2 MPaG, particularly preferably normal pressure to 0.1 MPaG.

  The polymerization step is preferably performed without a solvent from the viewpoint of cost, but a solvent can also be used. In that case, for example, aromatic hydrocarbons such as benzene, toluene, xylene and ethylbenzene, alicyclic hydrocarbons such as cyclopentane, cyclohexane and methylcyclohexane, aliphatic hydrocarbons such as pentane, hexane, heptane and octane, chloroform, Halogenated hydrocarbons such as dichloromethane can be used. These solvents may be used alone or in combination of two or more. A monomer such as 1-decene may be used as a solvent.

  In the method for producing an α-olefin polymer, as a method for adjusting the molecular weight of the polymer, the type of each catalyst component, the amount used, a method for selecting the polymerization temperature, a method for adding hydrogen, an inert gas such as nitrogen, etc. There is a method of adding.

When the α-olefin polymer is used as a lubricating oil, it is preferable to remove the α-olefin compound (α-olefin and α-olefin oligomer) having 24 or less carbon atoms after the above polymerization step. Examples of the removal method include a method of performing distillation under reduced pressure.
Moreover, it is preferable from a viewpoint of a stability improvement to give a hydrogenation process to an alpha olefin polymer and to manufacture a hydrogenated alpha olefin polymer. There is no restriction | limiting in particular as the method of hydrogenation, A well-known method can be used.

By the above production method, an α-olefin polymer having an appropriate viscosity as a lubricating oil can be easily produced industrially, and further, by controlling the reaction conditions such as adjusting the reaction temperature, The characteristics can be changed widely.
The above-mentioned “manufacturing easily industrially” means, for example, that the amount of hydrogen used and the amount of pressurization are small, use a reaction temperature that is relatively mild and easy to control, and dilute with an inert solvent. This means that no process is required.

  The blending amount of the α-olefin polymer in the lubricating oil composition of the present invention is preferably 10 to 80% by mass, more preferably 20 to 70% by mass, and further preferably 30 to 30%, based on the total amount of the composition. 60% by mass.

[Mineral oil]
As said mineral oil, what is classified into any of group 1-3 in the base oil category of API (American Petroleum Institute) is used.

  Mineral oil classified as Group 1 can be applied by appropriately combining refining means such as solvent refining, hydrorefining, and dewaxing to lubricating oil fractions obtained by atmospheric distillation of crude oil. Paraffinic mineral oil obtained is mentioned.

  Mineral oil classified as Group 2 includes, for example, paraffin obtained by appropriately combining refining means such as hydrocracking and dewaxing to a lubricating oil fraction obtained by atmospheric distillation of crude oil. Mineral oil.

  Mineral oil classified as Group 3 is produced, for example, by a paraffinic mineral oil produced by advanced hydrorefining or a dewaxing process for a lubricating oil fraction obtained by atmospheric distillation of crude oil. There are base oils refined by the ISODEWAX process for converting and dewaxing wax to isoparaffins, and base oils refined by the mobile WAX isomerization process, and these can also be suitably used in the present invention.

  The blending amount of the mineral oil in the lubricating oil composition of the present invention is preferably 80 to 10% by mass, more preferably 70 to 20% by mass, and further preferably 60 to 30% by mass based on the total amount of the composition. .

[Compatibilizer]
The lubricating oil composition of the present invention preferably contains one or more selected from esters, alkylnaphthalenes and alkylbenzenes from the viewpoint of compatibility.

(ester)
Examples of the ester include polybasic acids (for example, phthalic acid, succinic acid, alkyl succinic acid, alkenyl succinic acid, maleic acid, azelaic acid, peric acid, sebacic acid, fumaric acid, adipic acid, linoleic acid dimer, etc.). Polybasic acid ester obtained by reacting with various alcohols (for example, butyl alcohol, hexyl alcohol, 2-ethylhexyl alcohol, dodecyl alcohol, ethylene glycol, diethylene glycol monoether, propylene glycol, etc.); A polyol ester obtained by reacting a carboxylic acid with a polyol (for example, neopentyl glycol, trimethylolpropane, pentaerythritol, dipentaerythritol, tripentaerythritol, etc.); Sharp glycol ester and the like.
The ester preferably has a molecular weight of 200 or more, more preferably a molecular weight of 250 or more, and even more preferably 300 or more.

式中、ｎ１は、２〜２０（好ましくは２〜１０、より好ましくは２〜４）の整数であり、Ｒ¹は、水素原子、炭素数１〜２０（好ましくは炭素数４〜１８）のアルキル基、又は炭素数１〜２０（好ましくは炭素数６〜１６）のアルケニル基を表し、複数のＲ¹は互いに同一であっても異なっていてもよく、Ｌ¹は、炭素数１〜２０（好ましくは炭素数２〜１２）のアルカンのｎ１価の残基又は炭素数１〜２０（好ましくは炭素数２〜１２）のアルケンのｎ１価の残基を表す。 As said polybasic acid ester, what is represented by following formula (1) is mentioned.

In the formula, n1 is an integer of 2 to 20 (preferably 2 to 10, more preferably 2 to 4), and R ¹ is a hydrogen atom having 1 to 20 carbon atoms (preferably 4 to 18 carbon atoms). alkyl group, or a number of 1 to 20 carbon atoms (preferably having a carbon number of 6 to 16) represent an alkenyl group, a plurality of R ¹ may be the being the same or different, L ¹ is from 1 to 20 carbon atoms It represents an n1-valent residue of an alkane having (preferably 2 to 12 carbon atoms) or an n1-valent residue of an alkene having 1 to 20 carbon atoms (preferably 2 to 12 carbon atoms).

式中、ｎ２は、２〜２０（好ましくは２〜１０、より好ましくは２〜６）の整数であり、Ｒ²は、水素原子、炭素数１〜２０（好ましくは炭素数２〜１８）のアルキル基、又は炭素数１〜２０（好ましくは炭素数２〜１８）のアルケニル基を表し、複数のＲ²は互いに同一であっても異なっていてもよく、Ｌ²は、炭素数１〜２０（好ましくは炭素数２〜１８）のアルカンのｎ２価の残基又は炭素数１〜２０（好ましくは炭素数２〜１８）のアルケンのｎ２価の残基を表す。 Moreover, as said polyol ester, what is represented by following formula (2) is mentioned.

In the formula, n2 is an integer of 2 to 20 (preferably 2 to 10, more preferably 2 to 6), and R ² is a hydrogen atom, having 1 to 20 carbon atoms (preferably 2 to 18 carbon atoms). alkyl group, or a number of 1 to 20 carbon atoms (preferably 2 to 18 carbon atoms) alkenyl group, a plurality of R ² may being the same or different, L ² is from 1 to 20 carbon atoms It represents an n2-valent residue of an alkane (preferably having 2 to 18 carbon atoms) or an n2-valent residue of an alkene having 1 to 20 carbon atoms (preferably 2 to 18 carbon atoms).

(Alkylnaphthalene / alkylbenzene)
The alkylnaphthalene and alkylbenzene preferably have an alkyl chain length of 6 to 14 carbon atoms, and these can be produced by Friedel-Crafts alkylation reaction of benzene or naphthalene and olefin. Examples of the olefin used here include linear or branched olefins.

  In order to ensure a high viscosity index (VI), the total amount of the ester, alkylnaphthalene and alkylbenzene in the lubricating oil composition of the present invention is preferably 3% by mass or more based on the total amount of the composition, 3-20 It is more preferable that it is mass%, and it is further more preferable that it is 3-15 mass%.

[Additive]
Various known additives can be appropriately blended in the lubricating oil composition of the present invention as long as the object of the present invention is not impaired.
Specific examples of the additives include detergent dispersants, antioxidants, rust inhibitors, antiwear agents, friction modifiers, friction modifiers, pour point depressants, antifoaming agents, extreme pressure agents, viscosity index improvers. And thickeners.
The compounding amount of these additives is the total amount of all additives with respect to the total amount of the composition, preferably 0.5 to 40% by mass, more preferably 0.8 to 30% by mass, More preferably, it is 15 mass%.

(Cleaning dispersant)
Various known detergent dispersants can be used as the detergent dispersant blended in the lubricating oil composition of the present invention.
Specific examples include metal sulfonates, metal phenates, metal phosphonates, succinimides, and the like, and ashless detergent-dispersants such as alkenyl succinimides and alkenyl succinates, alkalis Examples include earth metal detergents and dispersants.

(Antioxidant)
Various known antioxidants can be used as the antioxidant blended in the lubricating oil composition of the present invention.
Specifically, 2,6-di-tert-butyl-4-methylphenol; 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4- {4, Monophenols such as 6-bis (octylthio) -1,3,5-triazin-2-ylamino} phenol, 4,4′-methylenebis (2,6-di-tert-butylphenol); 2,2′-methylenebis Diphenolic antioxidants such as (4-ethyl-6-tert-butylphenol), amine antioxidants such as alkylated diphenylamine and alkylated phenyl-α-naphthylamine, phosphorus antioxidants such as phosphonic acid esters, etc. Can be mentioned

(Rust inhibitor)
Examples of the rust preventive compounded in the lubricating oil composition of the present invention include fatty acids such as stearic acid, dicarboxylic acids, (short chain) alkenyl succinic acids, partial esters thereof and nitrogen-containing derivatives thereof, various amines. Compound, carboxylic acid metal salt, alkyl sulfonate, polyhydric alcohol ester (for example, partial carboxylic acid ester such as sorbitan monooleate), fatty acid amine, oxidized paraffin, nonionic polyoxyalkylene agent (for example, polyoxyethylene lauryl) Ether, polyoxyethylene higher alcohol ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene octyl stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene monostearate Rensorbitol, polyoxyethylene sorbitol monooleate, and polyethylene glycol monooleate), phosphorus compounds such as phosphate esters, sulfonates such as calcium (Ca), barium (Ba), sodium (Na), and sulfonic acid compounds, etc. Is mentioned.

(Antiwear agent)
Various known antiwear agents can be used as the antiwear agent blended in the lubricating oil composition of the present invention. Specifically, for example, inorganic or organic molybdenum compounds such as molybdenum disulfide, organic boron compounds such as alkyl mercaptyl borate; graphite, antimony sulfide, boron compounds, polytetrafluoroethylene and the like can be exemplified.

(Friction modifier)
Various known friction modifiers can be used as the friction modifier to be blended in the lubricating oil composition of the present invention. Specifically, for example, an amine compound, a fatty acid amide, having at least one alkyl group or alkenyl group having 6 to 30 carbon atoms, particularly a linear alkyl group or linear alkenyl group having 8 to 24 carbon atoms in the molecule, Examples thereof include fatty acid metal salts. Examples of the amine compound include aliphatic (poly) amines having a linear or branched alkyl group or alkenyl group, or alkylene oxide adducts thereof.

(Friction modifier)
Examples of friction modifiers to be blended in the lubricating oil composition of the present invention include alkoxylated aliphatic amines; boronated aliphatic epoxides; aliphatic phosphorous acid, aliphatic epoxides, aliphatic amines, and boronated alkoxylated aliphatic amines. Fatty acid metal salts, fatty acid amides, glycerol esters, boronated glycerol esters; and aliphatic imidazolines as disclosed in US Pat. No. 6,372,696; C4 to C75, preferably C6 to C24, most preferably C6 to Examples thereof include a reaction product of a C20 fatty acid ester and a nitrogen-containing compound selected from the group consisting of ammonia and alkanolamine.

(Pour point depressant)
Various known pour point depressants can be used as the pour point depressant to be blended in the lubricating oil composition of the present invention. Specifically, for example, polymethacrylate, alkylnaphthalene and the like can be exemplified.

(Defoamer)
Various known antifoaming agents can be used as the antifoaming agent blended in the lubricating oil composition of the present invention. Specific examples include silicone oil compounds such as alkyl methacrylate polymer, dimethylsiloxane, silica gel dispersion, and dimethylsilicone polymer, alcohol-based or ester-based compounds, and the like.

(Extreme pressure agent)
Various known extreme pressure agents can be used as the extreme pressure agent blended in the lubricating oil composition of the present invention.
Specifically, for example, sulfur extreme pressure agents such as sulfides, sulfoxides, sulfones, thiophosphinates, thiocarbonates, sulfurized fats and oils, sulfurized olefins; phosphoric acid esters, phosphorous acid esters, phosphoric acid esters Illustrative are phosphoric acids such as amine salts and phosphite amines; and halogen compounds such as chlorinated hydrocarbons.

(Viscosity index improver)
Examples of the viscosity index improver blended in the lubricating oil composition of the present invention include poly (alkyl methacrylate), ethylene-propylene copolymer, styrene-butadiene copolymer, and polyisoprene.

(Thickener)
Examples of the thickener blended in the lubricating oil composition of the present invention include polyurea acetate and lithium stearate.

  EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.

Examples 1-2 and Comparative Examples 1-2
Lubricating oil compositions having the compositions shown in Table 1 were prepared and their compatibility was evaluated.
(Evaluation method)
The base oil and lubricating oil composition were evaluated by the following methods.
(1) Kinematic viscosity and viscosity index Kinematic viscosity was measured according to JIS K2283. The viscosity index was calculated from the kinematic viscosity according to JIS K 2283.
(2) Number average molecular weight (Mn) and molecular weight distribution (Mw / Mn)
Using a GPC-900 (column; TOSOH TSK-GEL MULTIPIORE HXL-M (2) + Shodex KF801 (1)) apparatus manufactured by JASCO Corporation, the solvent; tetrahydrofuran; temperature;
(3) Mesotriad fraction (mm)
It was determined using ¹³ C-NMR by the method described in [Macromolecules 24, 2334 (1991); Polymer, 30, 1350 (1989)].
(4) BF viscosity BF viscosity (unit: mPa · s) was measured according to ASTM D2983.
(5) Oxidation stability test (ISOT)
This was performed according to JIS K2514. Specifically, the sample oil was kept at 165.5 ° C., forcibly stirred at 1300 rpm in the presence of a steel-copper catalyst, and held for 96 hours while surrounding air was taken into the sample oil by stirring. Thereafter, the kinematic viscosity and acid value of the sample oil were measured in the same manner as in the thermal stability test described above.
(6) Pour point Measured according to JIS K 2269.

Mineral oil: Group 2 mineral oil (500 neutral)
α-olefin polymer: 1-octene / 1-dodecene copolymer (1-octene unit: 1-dodecene unit ratio = 1: 1 (molar ratio), 100 ° C. kinematic viscosity = 126 mm ² / s, 40 ° C. kinematic viscosity = 1230 mm ² / s, viscosity index = 207, number average molecular weight (Mn) = 5,900, weight average molecular weight (Mw) = 7,000, molecular weight distribution (Mw / Mn) = 1.6, mesotriad fraction (mm ) = 35 mol%), pour point (° C.) = − 40 ° C.
Bright stock: 100 ° C. kinematic viscosity = 31.34 mm ² / s, 40 ° C. kinematic viscosity = 477.1 mm ² / s, viscosity index = 96, pour point (° C.) = − 15.0
Pour point depressant: manufactured by Sanyo Chemical Industries, Ltd.
Compatibilizer: Alkylbenzene, manufactured by JX Nippon Oil & Energy, “Alkene 200P”
Additive package: “HiTEC 3339” manufactured by Afton Chemical Co., Ltd.
Copper plate corrosion inhibitor: “Irgamet 39” manufactured by BASF Japan

  The lubricating oil composition of the present invention has a high viscosity index and good low-temperature fluidity, and preferably has excellent oxidation stability and high viscosity, and thus is useful for wind power generation applications and the like. .

Claims (12)

It contains an α-olefin polymer satisfying the following (1) to (3) and a mineral oil classified into any of groups 1 to 3 in the API (American Petroleum Institute) base oil category, and the pour point is −30 ° C. A lubricating oil composition having a viscosity index of 110 or more.
(1) The 100 ° C. kinematic viscosity is 20 to 200 mm ² / s.
(2) The number average molecular weight (Mn) is 1,000 to 9,000.
(3) The viscosity index (VI) is 160 or more. The lubricating oil composition according to claim 1, wherein the α-olefin polymer is synthesized using a metallocene catalyst and satisfies the following (a) and (b).
(A) The proportion of polymerization ends measured by ¹ H-NMR being 2,1 insertion is 30 mol% or more of all molecules.
(B) Mesotriad fraction (mm) measured by ¹³ C-NMR is 50 mol% or less. The lubricating oil composition according to claim 1 or 2, wherein the α-olefin polymer has an average number of short-chain branches per molecule of 1.3 or less as measured by ¹³ C-NMR.   The lubricating oil composition according to any one of claims 1 to 3, wherein the α-olefin polymer is a 1-octene / 1-dodecene copolymer.   The lubricating oil composition according to any one of claims 1 to 4, wherein the α-olefin polymer has a weight average molecular weight (Mw) measured by GPC of 200 to 30,000. The lubricating oil composition according to claim 4, wherein the α-olefin polymer is synthesized using a metallocene catalyst and satisfies the following (b) and (c).
(B) Mesotriad fraction (mm) measured by ¹³ C-NMR is 50 mol% or less.
(C) The ratio of 1-octene unit to 1-dodecene unit is 20:80 to 80:20 in molar ratio.   Furthermore, the lubricating oil composition in any one of Claims 1-6 containing 1 or more types selected from ester, alkyl naphthalene, and alkylbenzene.   The lubricating oil composition according to any one of claims 1 to 7, which has a pour point of -33 ° C or lower.   The lubricating oil composition according to any one of claims 1 to 8, which has a viscosity index of 135 or more. The lubricating oil composition according to claim 1, wherein the α-olefin polymer has a 100 ° C. kinematic viscosity of 40 to 160 mm ² / s.   The number average molecular weight (Mn) of the said alpha olefin polymer is 2,500-7,500, The lubricating oil composition in any one of Claims 1-10.   The lubricating oil composition according to claim 1, wherein the α-olefin polymer has a viscosity index of 170 or more.