JP5911915B2 - Improved olefin copolymer composition for modifying the viscosity of lubricating oils - Google Patents

Description

  Embodiments of the present invention generally relate to methods and compositions for improving the viscosity of lubricating oils. More particularly, embodiments of the present invention relate to viscosity modifiers for lubricating oils and methods for producing viscosity modifiers.

The viscosity of the lubricating oil depends on the temperature. Lubricating oil compositions generally contain a viscosity index (“VI”) modifying component, alter the rheological behavior to increase the lubricant viscosity, and are more constant over the entire temperature range in which the lubricant is used. Work to be a viscosity of.
The viscosity index has been used to measure the rate of change in viscosity of a liquid in relation to temperature. In general, the greater the viscosity index, the smaller the relative change in viscosity with temperature. VI improvers or viscosity modifiers are used to reduce the temperature dependence of the viscosity of the lubricant composition, and the lubricant composition can be used over a wide temperature range. In other words, the VI improver prevents the lubricant composition from becoming further at high temperatures, eg, midsummer temperatures, and prevents it from becoming too viscous at low temperatures, eg, midwinter temperatures. Known VI improvers include polymethacrylates, olefin copolymers such as ethylene-propylene copolymers and ethylene-propylene diene-modified copolymers (EPDMs), and hydrogen such as styrene-ethylene / butylene-styrene copolymers (SEBS). Styrene block copolymer.

In recent years, ethylene / α-olefin copolymers have been widely used as viscosity modifiers, and have shown the effect of improving the viscosity index for the purpose of reducing the temperature dependence of the viscosity of the lubricant. See, for example, US Pat. No. 6,589,920, US Pat. No. 5,391,617, US Pat. No. 7,053,153, and US Pat. No. 5,374,700. Lubricant loses its fluidity at low temperatures because the wax component therein tends to solidify as crystals.
The high ethylene content copolymer effectively improves the thickening, shear stability and low temperature viscosity properties of the oil, while the low ethylene content copolymer is added to lower the pour point of the oil. Mixtures of amorphous and semi-crystalline ethylene propylene copolymers are also well known as lubricating oil compositions. The combination of the two ethylene-propylene copolymers can improve thickening efficiency, shear stability, low temperature viscosity properties and pour point. See, for example, US Pat. No. 5,391,617 and European Patent No. 0,638,611. However, it has been found that the ethylene component of these ethylene-based copolymers tends to interact with the wax in the oil gel at a high rate.

  Accordingly, there is a need for new VI improvers or viscosity modifiers that have improved low temperature properties and reduce the temperature dependence of the viscosity of the lubricant composition, and lubricant compositions that can be used over a wide temperature range.

(Summary of Invention)
Lubricating oil compositions and methods for producing lubricating oil compositions are provided. In at least certain embodiments, the lubricating oil composition is derived from a base oil, 60% to 98% by weight propylene derived units and 2% to 40% by weight of one or more other alpha olefins. And at least one propylene-based polymer containing units. The triad regularity of the propylene-based polymer is greater than 90%, the heat of fusion is less than 80 J / g, the weight average molecular weight (Mw) measured by GPC is from 70,000 to 250,000, and the MWD is 2 0 to 2.5.

  In at least one other specific embodiment, the lubricating oil composition is 0.5% to 15% by weight of at least one propylene-based polymer, based on the total weight of the lubricating oil composition, A propylene-based polymer containing from 5% to 95% by weight of propylene-derived units and from 5% to 30% by weight of units derived from one or more other alpha olefins; based on the total weight of the lubricating oil composition 60% to 98% by weight base oil; 0.1% to 20% by weight of one or more dispersants, based on the total weight of the lubricating oil composition; 0.1 to 10% by weight of one or more pour point depressants based on the total weight of The heat of fusion of propylene-based polymers is less than 80 J / g, the weight average molecular weight (Mw) measured by GPC is from 120,000 to 150,000, and the MWD is from 2.0 to 2.5.

  In at least one other specific embodiment, the lubricating oil composition comprises a base oil, 80% to 88% by weight propylene derived units and 12% to 20% by weight of one or more other alpha olefins. And at least one propylene-based polymer containing units derived from The propylene-based polymer has a triad regularity of 90% or more, a heat of fusion of less than 80 J / g, a weight average molecular weight (Mw) measured by GPC of 120,000 to 250,000, and an MWD of 2.0 to 2.5. The propylene-based polymer is present in an amount of 0.5% to 15% by weight, based on the total weight of the lubricating oil composition.

  In at least one other specific embodiment, the lubricating oil composition is 0.5% to 15% by weight of at least one propylene-based polymer, based on the total weight of the lubricating oil composition, Based on a propylene-based polymer containing from wt% to 88 wt% propylene derived units and from 12 wt% to 20 wt% of one or more other alpha olefin derived units, and based on the total weight of the lubricating oil composition, 60% to 98% by weight of base oil, 0.1% to 20% by weight of one or more dispersants, based on the total weight of the lubricating oil composition, and the total weight of the lubricating oil composition On the basis of 0.1 to 10% by weight of one or more pour point depressants. The propylene-based polymer has a triad regularity of 90% or more, a heat of fusion of less than 80 J / g, a weight average molecular weight (Mw) measured by GPC of 120,000 to 250,000, and an MWD of 2.0 to 2.5.

(Detailed explanation)
Provide a detailed description. Each of the appended claims defines a separate invention, which for infringement is recognized to include equivalents to the various elements or limitations set forth in the claims. . Depending on the context, all references to “invention” below may refer to certain specific embodiments only. In other instances, references to “invention” are to be understood as referring to one or more subject matter in the claims, although not necessarily all. Each of the inventions is described in more detail below and includes specific embodiments, descriptions and examples, but the invention is not limited to these embodiments, descriptions or examples (information and information available in this patent). It is not limited to those that can be created and used by those skilled in the art when combined with science and technology. Further, as will be apparent to those skilled in the art, each description of the embodiments and claims of this application may be modified by the addition of elements not described, or may be described herein. It may be limited only to these elements.

  Propylene-based polymers are used as viscosity index improvers. Surprisingly, these polymers have been found to have acceptable properties as viscosity index improvers with good shear stability and viscosity properties. More particularly, propylene-based polymers with low α-olefin content, when used as VI improvers, improve oil thickening, shear stability and low temperature viscosity properties while It has been found to lower the pour point. These propylene-based VI improvers reduce the temperature dependence of the viscosity of the lubricant composition so that the lubricant composition can be used over a wide temperature range without producing a solid or gel. .

Propylene-based polymer The propylene-based polymer can be one or more propylene-α-olefin-copolymers, propylene-α-olefin-diene terpolymers, or propylene-diene copolymers. However, for the sake of brevity and ease of description, the terms “propylene-based polymer” and “PCP” are used interchangeably herein and refer to one containing 60% to 99.7% by weight of propylene-derived units. Or a plurality of propylene-α-olefin copolymers, propylene-α-olefin-diene terpolymers and propylene-diene copolymers. Further, for ease of description, when referring to the PCP of the present invention, a plurality of monomers (ie, propylene and ethylene) or monomer derived units (ie, propylene derived units and / or α-olefin derived units) May be referred to interchangeably with PCP manufactured from
In one embodiment, the propylene-based polymer can be prepared by polymerization of propylene and one or more α-olefins. The one or more α-olefins contain ethylene, or one or more C _{4 to} C ₂₀ α-olefins, or a combination of ethylene and one or more C _{4 to} C ₂₀ α-olefins. Also good. In a preferred embodiment, the one or more α-olefins contain ethylene.

In another embodiment, the propylene-based polymer comprises propylene and ethylene and / or one or more C _{4 to} C ₂₀ α-olefins, or ethylene and one or more C _{4 to} C ₂₀ α-olefins. It can be prepared by polymerizing a combination of one or more dienes. The one or more dienes can be conjugated or non-conjugated. Preferably, the one or more dienes are non-conjugated.
In another embodiment, the propylene-based polymer can be prepared by polymerization of propylene and one or more dienes. In yet another embodiment, the propylene-based polymer is propylene and ethylene and / or at least one C ₄ -C ₂₀ α-olefin, or ethylene and at least one C ₄ -C ₂₀ α-olefin and one or more It can be prepared by polymerizing combinations with dienes. The one or more dienes can be conjugated or non-conjugated. Preferably, the one or more dienes are non-conjugated.

Comonomers can be linear or branched. Preferred linear comonomers contain ethylene or a C _{4 to} C ₈ α-olefin, more preferably ethylene, 1-butene, 1-hexene, and 1-octene, even more preferably ethylene or 1-butene. Preferred branched comonomers include 4-methyl-1-pentene, 3-methyl-1-pentene, and 3,5,5-trimethyl-1-hexene. In one or more embodiments, the comonomer can contain styrene.
Examples of dienes include, but are not limited to, 5-ethylidene-2-norbornene (ENB), 1,4-hexadiene, 5-methylene-2-norbornene (MNB), 1,6-octadiene, 5-methyl-1,4-hexadiene, 3,7-dimethyl-1,6-octadiene, 1,3-cyclopentadiene, 1,4-cyclohexadiene, vinylnorbornene (VNB), dicyclopentadiene (DCPD), and These combinations are mentioned. Preferably, the diene is ENB.

  Preferred methods and catalysts for producing propylene-based polymers are described in US Patent Application Publication No. 2004/0236042 and International Patent Application Publication No. WO 2005/049672 and US Patents, which are incorporated herein by reference in their entirety. Found in 6,881,800. Pyridineamine complexes, such as those described in International Patent Application Publication No. WO2003 / 040201, are also useful for producing (manufacturing) propylene-based polymers useful in the present invention. The catalyst may contain a fluid complex that periodically undergoes intermolecular rearrangement, thereby providing the desired disruption in stereoregularity, as described in US Pat. No. 6,559,262. The catalyst can be a stereorigid complex with multiple effects on propylene insertion. See European Patent No. 1070087 Rieger. The catalyst described in EP 1614699 can also be used to produce a skeleton suitable for the present invention.

The average propylene content on a weight percent basis of the propylene-based polymer is from about 60% to about 99.7%, more preferably from about 60% to about 99.5%, more preferably from weight percent of the polymer. There may be from about 60% to about 98%, more preferably from about 60% to about 97%, more preferably from about 60% to about 95% by weight. Other preferred ranges are from about 70% to about 95% by weight propylene-derived units, more preferably from about 75% to about 95% by weight propylene-derived units, based on the weight of the polymer, Preferably in the range of about 80% to about 95% propylene-derived units, more preferably in the range of about 80% to about 90% propylene-derived units, more preferably from about 80% to about 88%. % Propylene-derived units. In one embodiment, the balance contains one or more α-olefin derived units. The one or more α-olefins may contain ethylene or one or more C _{4 to} C ₂₀ α-olefins or a combination of ethylene and one or more C4 to C20 α-olefins. In another embodiment, the one or more α-olefins are ethylene or one or more C ₄ -C ₁₂ α-olefins or ethylene and one or more C ₄ -C ₁₂ α-olefins. Combinations may be included. In preferred embodiments, the one or more α-olefins contain ethylene. In another embodiment, the one or more α-olefins contain butene.

In another embodiment, the balance contains one or more diene derived units and may contain one or more α-olefin derived units as described above. In one or more embodiments above or elsewhere herein, the α-olefin is ethylene, butene, hexene or octene. In other embodiments, there are two α-olefins, preferably ethylene and any one of butene, hexene or octene.
In embodiments containing a diene, the propylene-based polymer is about 0.2% to about 24%, more preferably about 0.5% to about 12%, more preferably, based on the weight of the polymer. From about 0.6% to about 8%, more preferably from about 0.7% to about 5% by weight of non-conjugated diene derived units. In other embodiments, the diene-containing range is from about 0.2% to about 10%, more preferably from about 0.2% to about 5%, more preferably from about 0.2% by weight based on the weight of the polymer. 2% to about 4%, preferably about 0.2% to about 3.5%, preferably about 0.2% to about 3.0%, preferably about 0.2% About 2.5% by weight. In one or more embodiments described above or elsewhere herein, the propylene-based polymer comprises from about 0.5% to about 4%, more preferably from about 0.5%, derived units of ENB. From about 0.5% to about 2.5%, more preferably from about 0.5% to about 2.0% by weight.

In embodiments containing other dienes, the propylene-based polymer preferably contains one or more ranges of propylene-derived units and diene-derived units as described above, with the balance being one or more C ₂ and / or or containing C ₄ -C ₂₀ olefins. Generally, this results in a propylene-based polymer containing preferably from about 5% to about 40% by weight of one or more C ₂ and / or C ₄ -C ₂₀ olefins, based on the weight of the polymer. When C ₂ and / or C ₄ -C ₂₀ olefins are present, the total amount of these olefins in the polymer is preferably at least about 5% by weight and is within the ranges described herein. to go into. Other preferred ranges for the one or more α-olefins are from about 5% to about 35%, more preferably from about 5% to about 30%, more preferably from about 5% to about 25% by weight. More preferably from about 5% to about 20%, more preferably from about 5 to about 17%, more preferably from about 5% to about 16% by weight.

  The weight average molecular weight (Mw) of the propylene-based polymer is 5,000,000 or less, the number average molecular weight (Mn) is about 3,000,000 or less, and the z-average molecular weight (Mz) is about 10,000. Measured by the weight average molecular weight (Mw) of a polymer using isotactic polypropylene as a baseline, with a g index of 0.95 or higher, all of which are for example 3D SEC, It can be determined by size exclusion chromatography, also referred to as GPC-3D, as described in the specification.

In one or more embodiments above or elsewhere herein, the Mw of the propylene-based polymer is from about 5,000 to about 5,000,000 g / mol, more preferably the Mw is about 10,000. To about 1,000,000 g / mole, more preferably Mw is about 20,000 to about 500,000 g / mole, more preferably Mw is about 50,000 to about 400,000 g / mole, more preferably Mw is about 60,000 to about 300,000 g / mol, more preferably Mw is from about 70,000 to about 250,000 g / mol, and Mw is determined as described herein. In one or more embodiments, the propylene-based polymer has a minimum Mw of about 70,000, about 80,000, about 90,000, about 100,000, or about 120,000 up to about 160, 000, about 180,000, about 200,000, about 220,000, or about 250,000.
In one or more embodiments above or elsewhere herein, the Mn of the propylene-based polymer is from about 2,500 to about 2,500,000 g / mol, more preferably the Mn is about 5,000. To about 500,000 g / mol, more preferably Mn is about 10,000 to about 250,000 g / mol, more preferably Mn is about 25,000 to about 200,000 g / mol, and Mn is Determined as described herein.

In one or more embodiments above or elsewhere herein, the Mz of the propylene-based polymer is from about 10,000 to about 7,000,000 g / mol, more preferably the Mz is about 50 1,000 to about 1,000,000 g / mole, more preferably Mz is from about 80,000 to about 700,000 g / mole, more preferably Mz is from about 100,000 to about 500,000 g / mole. Yes, Mz is determined as described herein.
The molecular weight distribution index (MWD = (Mw / Mn)) of propylene-based polymers is often referred to as the “polydispersity index” (PDI) and can be about 1.5 to 40. In one embodiment, the MWD has an upper limit of about 40, or 20, or 10, or 5, or 4.5, or 4, or 3, or 2.5, or 2.4, or 2.2 The lower limit can be about 1.3, or 1.5, or 1.7, or 1.8, or 2.0, or 2.1. In one or more embodiments described above or elsewhere herein, the propylene based polymer has an MWD of about 1.8 to 5, more preferably 1.8 to 3, and most preferably about 2.1. To 2.4. Techniques for determining molecular weight (Mn and Mw) and molecular weight distribution (MWD) are described in US Pat. No. 4,540,753 (incorporated herein by reference for US patent practice) and cited therein. Published references, “Macromolecules, 1988, 21, 3360 (Verstrate et al.)” And the references cited therein, which are incorporated herein by reference for US patent practice, and Can be found according to the procedure disclosed in US Pat. No. 6,525,157, 5 columns, 1 line-44, which is incorporated herein by reference in its entirety.

In one or more embodiments above or elsewhere herein, the propylene-based polymer has a g ′ index value of 0.95 or higher, preferably at least 0.98 or higher, more preferably at least 0.99. The g ′ index is measured in Mw of the polymer, using the intrinsic viscosity of isotactic polypropylene as the baseline. As used herein, the g ′ index is defined as follows:
g ′ = η _{b /} η _l
(1) η _b is the intrinsic viscosity of the propylene-based polymer, and η _l is the intrinsic viscosity of a linear polymer having the same viscosity average molecular weight (Mv) as the propylene-based polymer. η _l = KM _v α, K and α are values measured with linear polymers and should be obtained with the same instrument used for g ′ index measurement.
In one or more embodiments above or elsewhere herein, the density of the propylene-based polymer is about 0.85 g / cm ³ measured at room temperature according to ASTM D-1505 test method. To about 0.92 g / cm ³ , more preferably about 0.87 g / cm ³ to 0.90 g / cm ³ , more preferably about 0.88 g / cm ³ to about 0.89 g / cm ³ .

  In one or more embodiments above or elsewhere herein, the melt flow rate (MFR, 2.16 kg volume @ 230 ° C.) of the propylene-based polymer has been modified (described below). It is 0.2 g / 10 min or more as measured by ASTM D-1238 test method. Preferably, the MFR (2.16 kg @ 230 ° C.) is from about 0.5 g / 10 min to about 200 g / 10 min, more preferably from about 1 g / 10 min to about 100 g / 10 min. In one embodiment, the upper limit of MFR for propylene-based polymers is about 200 g / 10 min, about 150 g / 10 min, about 100 g / 10 min, about 75 g / 10 min, about 50 g / 10 min, about 30 g / 10. Min, about 25 g / 10 min, or about 20 g / 10 min with lower limits of about 0.1 g / 10 min, about 0.5 g / 10 min, about 1 g / 10 min, about 2 g / 10 min, about 3 g / 10 minutes, about 4 g / 10 minutes, about 5 g / 10 minutes, about 8 g / 10 minutes, or about 10 g / 10 minutes. In another embodiment, the MFR of the propylene based polymer is from 0.5 g / 10 min to 200 g / 10 min, preferably from 2 g / 10 min to 30 g / 10 min, more preferably from 3 g / 10 min to 21 g / 10 min. More preferably 5 g / 10 min to 30 g / 10 min, more preferably 10 g / 10 min to 30 g / 10 min, more preferably 10 g / 10 min to about 25 g / 10 min, more preferably 2 g. / 10 minutes to about 10 g / 10 minutes.

The Mooney viscosity ML (1 + 4) @ 125 ° C., determined according to ASTM D1646 for propylene-based polymers, may be less than 100, more preferably less than 75, even more preferably less than 60, and most preferably less than 30. In one or more embodiments above or elsewhere herein, the Mooney viscosity range is a minimum of about 1, 5, 10, or 15 and a maximum of about 30, 60, 75, or 100. possible.
In one or more embodiments described above or elsewhere herein, the heat of fusion (Hf) of a propylene-based polymer, determined according to the DSC procedure described below, is about 0.5 joules per gram (J / G) or more and about 80 J / g or less, preferably about 75 J / g or less, preferably about 70 J / g or less, more preferably about 60 J / g or less, more preferably About 50 J / g or less, more preferably about 35 J / g or less. Also preferably, the heat of fusion of the propylene-based polymer is about 1 J / g or more, preferably about 5 J / g or more. In another embodiment, the heat of fusion (Hf) of the propylene-based polymer is from about 0.5 J / g to about 75 J / g, preferably from about 1 J / g to about 75 J / g, more preferably about 0.5 J / g to about 35 J / g. Preferred propylene-based polymers and compositions can be characterized by both melting point (Tm) and heat of fusion, and their properties are affected by the presence of comonomers or steric irregularities that prevent the formation of crystallites by the polymer chain. receive. In one or more embodiments, the lower heat of fusion range is 1.0 J / g, or 1.5 J / g, or 3.0 J / g, or 4.0 J / g, or 6.0 J / g. Or 7.0 J / g with an upper limit of 30 J / g, or 35 J / g, or 40 J / g, or 50 J / g, or 60 J / g or 70 J / g, or 75 J / g, or 80 J / g is there.

  The crystallinity of a propylene-based polymer can also be expressed in units of crystallinity ratio (ie,% crystallinity). In certain embodiments described above or elsewhere herein, the propylene-based polymer is characterized by having a 0% crystallinity determined by the DSC procedure described below, substantially Amorphous. In other embodiments described above or elsewhere herein, the% crystallinity of the propylene-based polymer is 0.5% to 40%, preferably 1% to 30%, more preferably 5 % To 25% and the% crystallinity is determined by the DSC procedure described below. In another embodiment, the crystallinity of the propylene-based polymer is preferably less than 40%, preferably from about 0.25% to about 25%, more preferably from about 0.5% to about 22%. And most preferably from about 0.5% to about 20%. As disclosed above, the thermal energy of the top polypropylene is estimated to be 189 J / g (ie, 100% crystallinity is equal to 209 J / g).

In addition to this level of crystallinity, propylene-based polymers preferably have a single broad melting transition. However, although propylene-based polymers exhibit a secondary melting peak adjacent to the main peak, for purposes of this specification, the secondary melting peaks are combined together as a single melting point. The highest point of these peaks (relative to the baseline as described herein) is considered the melting point of the propylene-based polymer.
The melting point of the propylene-based polymer (measured by DSC) is preferably 100 ° C. or less, preferably less than 90 ° C., preferably less than 80 ° C., more preferably 75 ° C. or less, preferably The range is from about 25 ° C to about 80 ° C, preferably from about 25 ° C to about 75 ° C, more preferably from about 30 ° C to about 65 ° C.

The heat of fusion,% crystallinity and melting temperature of a propylene-based polymer can be determined with a differential scanning calorimetry (DSC) procedure, for example using the following steps.
About 0.5g placed between two Mylar (Mylar) ^{(registered trademark)} film ( "Mylar"). The Mylar / Polymer / Mylar “sandwich” is then placed on top of a small mold without an upper cover sheet. The dimensions of the mold are 1 inch × 2 inches × about 0.020 inch. The mold and sample are then placed in a heated hydraulic press. The pressing temperature is usually set between 150 ° C and 200 ° C. The pressure platen is closed and a force of about 15 tons is maintained for about 3-5 minutes. The platen is then opened, but at the temperature defined above, and the mylar / polymer / mylar “sandwich” is removed from the mold. Samples, Mylar / Polymer / Mylar “sandwiches” can be annealed by leaving them in the air at room temperature for 24 to 48 hours (note the real time). After the annealing period, the pressure pad is removed from the mylar and cut across and folded over itself to form two layers. From this bilayer, a disk is cut using a leather punch or other paper punch device. Five samples are prepared. The weight of the sample is recorded, but not less than 8 mg and not more than 12 mg. The samples are then individually placed in a 10 microliter aluminum pan. A non-ventilated aluminum lid is crimped to the top of each dish to ensure good contact between the sample and the dish. The sample pan was then placed in a calibrated DSC measuring instrument with an empty pan with a lid on the reference side and measured under N ₂ purge gas (approximately 20 ml / min) using the following parameters: . Five more samples were measured on an empty dish. Allows automatic subtraction of empty dish measurements from sample measurements. The DSC heat history is as follows. Cool the sample from room temperature to -75 ° C as soon as possible with DSC. Maintain -75 ° C for 3 minutes. At a heating rate of 20 ° C./min, the temperature is raised to a temperature sufficiently high to completely melt the sample. The thermogram generated in this step is used to determine the melting point, specific heat and degree of crystallinity. The output data from the DSC consists of time (minutes), temperature (° C.), and heat (watts). Each of the five sample melt thermograms is analyzed as follows. First, the total heat is divided by the sample weight to obtain the specific heat (unit: W / g). Second, a baseline is constructed and subtracted from the specific heat to give a baseline-subtracted heat quantity. A straight baseline is used for analysis herein. The lower limit of the baseline temperature is above the glass transition temperature, but below the temperature at which the sample begins to melt. The upper limit of the baseline temperature is a temperature that is 5 ° C. to 10 ° C. higher than completing the melting endotherm. The following three parameters are then determined independently for each of the five measurements.
(1) Melting point; the peak melting temperature is the temperature between the maximum baseline minus the lower limit baseline with the subtracted heat and the upper limit baseline.
(2) Melting specific heat; Δhm (J / g) is a region under melting endotherm obtained by integrating the baseline minus subtraction calorie with time between the upper and lower limits of the baseline.
(3) The percent crystallinity is determined by dividing the specific heat of fusion by 189 J / g and multiplying by 100.

  The sample melting temperature, specific heat, and percent crystallinity average 5 scans after removing outliers. Outliers are determined in the manner prescribed by Dixon (Biometrics, vol 9, # 1, March, 1953, 74-89) using a 95% confidence level.

The triad regularity of the triad regular polymer is the relative stereoregularity of the arrangement of three adjacent propylene units, and is a chain consisting of head-to-tail bonds represented by two combinations of m and r arrangements. Usually, propylene-based polymers are expressed as a percentage of the number of specific stereoregular units relative to all propylene triads in the polymer.
In one or more embodiments above or elsewhere herein, the triad regularity of the propylene-based polymer is about 80% or more, about 83% or more, about 85% or more, about 87% or more, About 90% or more, about 91% or more, about 92% or more, about 93% or more, about 94% or more, or about 95% or more. Preferably, the triad regularity of the propylene-based polymer is about 80% or higher, preferably about 85% or higher, or preferably about 90% or higher. In another embodiment, the triad regularity of the propylene-based polymer is about 88% or more, about 90% or more, or about 96% or more. In one or more embodiments, the range of triad regularity of the propylene-based polymer is 80%, or 82%, or 84%, or 86% at the lower limit and about 88%, 90% at the upper limit. 92%, 93%, or 94%, or 95%, or 96%, or more.

The triad regularity (mm part) of the propylene-based polymer can be determined by ¹³ C NMR spectrum and is given by
mm portion = PPP (mm) / (PPP (mm) + PPP (mr) + PPP (rr))
PPP (mm), PPP (mr), and PPP (rr) indicate peak areas derived from the methyl group of the second unit in the three propylene unit chains composed of the following head-to-tail bonds.

  The 13C NMR spectrum associated with the methyl carbon region (19-23 parts per million (ppm)) is shown in the first region (21.2-21.9 ppm), second region (20.3-21.0 ppm) and third region. It can be divided into regions (19.5-20.3 ppm). Each peak in the spectrum was identified with reference to the description in the magazine “Polymer, Volume 30 (1989), page 1350”. In the first region, the methyl group of the second unit in the three propylene unit chains represented by PPP (mm) resonates. In the second region, the methyl group of the second unit in the three propylene unit chains represented by PPP (mr) resonates, and the methyl group (PPE-methyl group) of the propylene unit in which the adjacent units are a propylene unit and an ethylene unit. ) Resonates (near 20.7 ppm). In the third region, the methyl group of the second unit in the three propylene unit chains represented by PPP (rr) resonates, and the methyl group of the propylene unit whose adjacent unit is an ethylene unit (EPE-methyl group) resonates. (Near 19.8 ppm). Further details and information can be found in US Pat. No. 5,504,172.

構造（２）：

（ｎは２以上である。） Examples of 2,1 insertion are shown in Structures 1 and 2 below.
Structure (1):

Structure (2):

(N is 2 or more.)

The peak of carbon A and the peak of carbon A ′ appear in the second region. As described above, the peak of carbon B and the peak of carbon B ′ appear in the third region. Among the peaks appearing from the first region to the third region, the peaks not based on the 3 propylene unit chain consisting of head-to-tail bonds are PPE-methyl group, EPE-methyl group, carbon A, carbon A ′, carbon B, And a peak based on carbon B ′.
The peak area based on the PPE-methyl group can be estimated by the peak area of the PPE-methine group (resonance around 30.8 ppm), and the peak area based on the EPE-methyl group is the peak area of the EPE-methine group ( Resonance at around 33.1 ppm). The peak area based on carbon A can be estimated by doubling the peak area of methine carbon to which the methyl group of carbon B is directly bonded (resonance near 33.9 ppm), and the peak area based on carbon A ′ is It can be estimated by the peak area of the methine carbon adjacent to the methyl group of carbon B ′ (resonance at around 33.6 ppm). The peak area based on carbon B can be estimated by the peak area of adjacent methine carbon (resonance near 33.9 ppm), and the peak area based on carbon B ′ is estimated from the adjacent methine carbon (resonance near 33.6 ppm). ) Can be estimated.

By subtracting these peak areas from the total peak area of the second region and the third region, a peak area based on three propylene unit chains (PPP (mr) and PPP (rr)) consisting of head-to-tail bonds is obtained. be able to. Thus, the peak areas of PPP (mm), PPP (mr) and PPP (rr) can be estimated, and the triad regularity of the propylene unit chain composed of the head-to-tail bond can be determined.
Similarly, by subtracting the peak area as an error in propylene insertion (both 2,1, and 1,3) from the peak area of the total peak area of the second and third regions, A peak area based on the three propylene unit-chains (PPP (mr) and PPP (rr)) can be obtained. Thus, the peak areas of PPP (mm), PPP (mr), and PPP (rr) can be estimated, and for this purpose, triad regularity of propylene unit chains composed of head-to-tail bonds can be determined. .

The ratio of 2,1-insertion to all propylene insertions in the propylene elastomer can be calculated by the following formula described in “Polymer, Volume 30 (1989), page 1350”.
The percentage of units inserted in reverse based on 2,1-insertion (%) is equal to:

The names of the peaks in the above formula are described in the magazine “Rubber Chemistry and Technology, Vol. 44 (1971), p. 781,” Carman, et al. Where Iαδ means αδ + peak area of secondary carbon peak. Since the peaks overlap, it is difficult to separate the peak area of Iαβ (structure (i)) from Iαβ (structure (ii)). Thus, the carbon peak in the corresponding region can be substituted.
Measurement of 1,3 insertion requires measurement of βγ peak. Two structures can contribute to the βγ peak. Two ethylene monomers following (1) 1,3 insertion of propylene monomer and (2) 2,1-insertion of propylene monomer. This peak is described as the 1.3 insertion peak, and we describe this βγ peak, which is described in US Pat. No. 5,504,172, where it is understood that this βγ peak represents an array of four methylene units. Use this procedure. The percentage (%) of these error amounts is obtained by dividing the region of βγ peak (resonance near 27.4 ppm) by the sum of 1/2 of the total methyl group peak and βγ peak region, and then into the resulting value. Determined by multiplying by 100. When α-olefins of 3 or more carbon atoms are polymerized using an olefin polymerization catalyst, many reverse inserted monomer units are present in the resulting olefin polymer molecule. Polyolefins prepared by polymerization of α-olefins of 3 or more carbon atoms in the presence of a chiral metallocene catalyst generate 2,1-insertion or 1,3-insertion in addition to the usual 1,2-insertion However, reverse inserted units such as 2,1-insertion or 1,3-insertion are formed in the olefin polymer molecule (Macromolecular Chemistry Rapid Communication, Vol. 8, 305 (1987), by K. Soga, T. Shiono, S. Takemura and W. Kaminski).

  Preferably, the proportion of propylene units inserted back of the propylene-based polymer, based on 2,1-insertion of propylene monomer in total propylene insertion, as measured by 13C NMR, is greater than 0.5%, or Greater than 0.6%. The percentage of propylene units inserted back into the propylene-based polymer, based on 1,3-insertion of propylene monomer, as measured by 13C NMR, is greater than 0.05%, or greater than 0.06%, or Greater than 0.07%, or greater than 0.08%, or greater than 0.085%.

In one or more mixed embodiments, the propylene-based polymer is polybutene, butadiene or isoprene that may be hydrogenated, or a combination of butadiene or isoprene and a polymer of styrene, an ester of a styrene / maleic anhydride polymer, styrene May be mixed with ester-based viscosity index modifiers such as / esters of maleic anhydride / acrylate terpolymers, and other polymer viscosity index modifiers such as polymethacrylic acid. Examples of the viscosity index modifier of the mixture include acrylate- or methacrylate-containing copolymers or copolymers of styrene, and styrene / maleic esters (typically prepared by esterification of styrene / maleic anhydride copolymers) and the like Of unsaturated carboxylic acid esters.

In one or more embodiments, the propylene-based polymer can itself be a blend of separate random propylene-based polymers. The mixture contains at least one of an ethylene-based polymer and a propylene-based polymer, or the ethylene-based polymer and a propylene-based polymer. The number of propylene-based polymers can be 3 or less, more preferably 2 or less. In embodiments where the propylene-based polymer is a blend of separate random propylene-based polymers, polybutene, polymers of styrene and butadiene or isoprene, or a combination of butadiene or isoprene, esters of styrene / maleic anhydride polymers, styrene / anhydrous It may be further mixed with ester based viscosity index modifiers such as maleic acid / acrylate terpolymer esters, and other polymer viscosity index modifiers such as polymethacrylic acid. Examples of the viscosity index modifier of the mixture are acrylate- or methacrylate-containing copolymers or copolymers of styrene, and styrene / maleic esters (typically prepared by esterification of styrene / maleic anhydride copolymers) Including esters of unsaturated carboxylic acids.
In one or more embodiments above or elsewhere herein, the propylene-based polymer may contain a blend of two propylene-based polymers that differ in olefin content, diene content, or both. .

  In another embodiment, the propylene-based polymer may contain a copolymer prepared according to the procedures of International Patent Application Publication No. WO 02/36651. Similarly, propylene-based polymers are disclosed in International Patent Application Publication No. WO2003 / 040201, International Patent Application Publication No. WO2003 / 040202, International Patent Application Publication No. WO2003 / 040095, International Patent Application Publication No. WO2003 / 040201, International Patent Application Publication No. It may contain polymers that are consistent with the polymers described in Patent Application Publication No. WO2003 / 040233 and / or International Patent Application Publication No. WO2003 / 040442. In addition, propylene-based polymers, along with suitable propylene homo- and copolymers described in US Pat. No. 6,770,713 and US Patent Application Publication No. 2005/215964, which are incorporated by reference in their entirety, It may contain polymers that are consistent with the polymers described in EP 1233191 and US Pat. No. 6,525,157. The propylene based polymer may contain one or more polymers consistent with the polymers described in EP 1614699 or EP 1017729.

Grafted (functionalized) backbone In one or more embodiments, a propylene-based polymer can be grafted (ie, “functionalized”) using one or more graft monomers. As used herein, the term “grafting” means covalently attaching a graft monomer to the polymer chain of a propylene-based polymer.
The grafting monomer can be or contain at least one ethylenically unsaturated carboxylic acid or acid derivative such as an acid anhydride, ester, salt, amide, imide, acrylate or the like. Examples of monomers include, but are not limited to, acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, mesaconic acid, maleic anhydride, 4-methylcyclohexene-1,2- Dicarboxylic anhydride, bicyclo (2.2.2) octene-2,3-dicarboxylic anhydride, 1,2,3,4,5,8,9,10-octahydronaphthalene-2,3-dicarboxylic acid Anhydride, 2-oxa-1,3-diketospiro (4.4) nonene, bicyclo (2.2.1) heptene-2,3-dicarboxylic acid anhydride, maleopimaric acid, tetrahydrophthalic acid anhydride, norbornene-2 , 3-dicarboxylic acid anhydride, nadic acid anhydride, methyl nadic acid anhydride, hymic acid anhydride, methyl hymic acid anhydride, and 5-methylbicyclo (2.2.1) hepte 2,3-dicarboxylic acid anhydride. Other suitable grafting monomers include methyl acrylate and higher alkyl acrylates, methyl methacrylate and higher alkyl methacrylates, acrylic acid, methacrylic acid, hydroxy-methyl methacrylate, hydroxyl-ethyl methacrylate and higher hydroxy-alkyl methacrylates. And glycidyl methacrylate. Maleic anhydride is a preferred grafting monomer.

In one or more embodiments, the grafted propylene-based polymer contains about 0.5% to about 10% by weight of ethylenically unsaturated carboxylic acid or acid derivative, more preferably about 0.5% by weight. % To about 6% by weight, more preferably about 0.5% to about 3% by weight. Other embodiments contain about 1% to about 6% by weight, more preferably about 1% to about 3% by weight. In a preferred embodiment where the grafting monomer is maleic anhydride, the maleic anhydride concentration of the graft polymer is preferably in the range of about 1% to about 6% by weight, preferably about 0.5% by weight or more, Highly preferably about 1.5% by weight.
Styrene and their derivatives such as paramethyl styrene, or other higher alkyl substituted styrenes such as t-butyl styrene, can be used as charge transfer agents in the presence of graft monomers to prevent chain scission. This further minimizes the beta-splitting reaction and can produce a high molecular weight graft polymer.

Preparation of grafted propylene-based polymer The grafted propylene-based polymer can be prepared using conventional techniques. For example, the graft polymer can be prepared in solution, in a fluidized bed reactor, or by melt grafting. Preferred graft polymers can be prepared by melt mixing in a shearing reactor such as an extrusion reactor. Particularly preferred are not only single screw, preferably twin screw extrusion reactors such as co-rotating meshing extruders or counter-rotating non-meshing extruders, but also kneaders such as those sold by Buss.
In one or more embodiments, the graft polymer can be prepared by melt mixing a non-grafted propylene-based polymer with a free radical generating catalyst such as a peroxide initiator in the presence of the grafting monomer. Preferred procedures for the grafting reaction include melting of the propylene-based polymer, addition and dispersion of the grafting monomer, addition of peroxide, and discharge of by-products by decomposition of unreacted monomer and peroxide. Other procedures may include the supply of monomer and peroxide previously dissolved in a solvent.

  Examples of peroxide initiators include, but are not limited to, diacyl peroxides such as benzoyl peroxide; tert-butyl peroxide benzoate, tert-butyl peroxide acetate, OO-tert-butyl O- (2- Peroxyesters such as ethylhexyl) monoperoxycarbonate; peroxyketals such as n-butyl-4,4-di- (tert-butylperoxy) valeric acid; and 1,1-bis (tertbutylperoxide) cyclohexane, 1,1 -Bis (tert-butyl peroxide) -3,3,5-trimethylcyclohexane, 2,2-bis (tert-butyl peroxide) butane (e), dicumyl peroxide, tert-butyl cumyl peroxide, di- (2- tert-buchi Peroxide-isopropyl- (2)) benzene, di-tert-butyl peroxide (DTBP), 2,5-dimethyl-2,5-di (tert-butyl peroxide) hexane, 2,5-dimethyl-2,5-di (Tert-butyl peroxide) hexyne, dialkyl peroxides such as 3,3,5,7,7-pentamethyl 1,2,4-trioxepane; and the like.

Base oil base oils can be or contain natural or synthetic oils of lubricating viscosity, depending on whether they come from hydrocracking, hydrogenation, other refining processes, crude processes, or rerefining processes. . The base oil can be used oil or contain. Examples of natural oils include animal oils, vegetable oils, mineral oils and mixtures thereof. Examples of synthetic oils include hydrocarbon oils, silicon-based oils, and liquid esters of acids containing phosphorus. Synthetic oils are not only prepared by the Fischer-Tropsch gas liquefaction synthesis procedure, but may be other gas liquefied oils.
In one embodiment, the base oil is a polyalphaolefin containing PAO-2, PAO-4, PAO-5, PAO-6, PAO-7, or PAO-8 (numbers relate to kinematic viscosity at 100 ° C.). (PAO) or include. Preferably, the polyalphaolefin is prepared from dodecene and / or decene. In general, the viscosity of polyalphaolefins suitable as oils of lubricating viscosity is less than that of PAO-20 or PAO-30 oils.

In one or more embodiments, the base oil may be defined as defined in the American Petroleum Institute (API) Base Oil Compatibility Guidelines. For example, the base oil can be or contain an API Group I, II, III, IV, V oil or mixtures thereof.
In one or more embodiments, the base oil may contain an oil conventionally used as a crankcase lubricating oil, or a mixture thereof. For example, suitable base oils can contain crankcase lubricants for spark ignition and compression ignition internal combustion engines such as automobile and truck engines, marine and rail diesel engines, and the like. Suitable base oils are conventionally used and / or as power transmission fluids such as automatic transmission fluids, tractor fluids, general tractor fluids and hydraulic fluids, heavy vehicle hydraulic fluids, power steering fluids and the like It can be or contain an oil suitable for use. Suitable base oils can be or contain gear lubricants, industrial lubricants, pump oils and other lubricants.

  In one or more embodiments, the base oil may not only contain petroleum-derived hydrocarbon oils, but also synthetic lubricating oils such as esters of dibasic acids; monobasic acids, polyglycols, dibasic acids And complex esters produced by esterifying alcohols; polyolefin oils, and the like. Thus, the described lubricating oil composition can be applied to synthetic base oils such as alkyl esters of dicarboxylic acids, polyglycols and alcohols; polyalpha-olefins; polybutenes; alkylbenzenes; organic esters of phosphoric acid; Can be properly incorporated. Lubricating oil compositions can be used in oils, for example mineral lubricating oils, in a concentration form such as 1% to 49% by weight for ease of handling, and the reaction of the present invention is carried out in oil as described above. May be prepared in this form.

Conventional oil additive lubricating oil compositions include, for example, pour point depressants, antiwear agents, antioxidants, other viscosity index improvers, dispersants, corrosion inhibitors, antifoaming agents, surfactants, rust prevention. One or more conventional additives such as agents, friction modifiers, and the like may be included.
Corrosion inhibitors, also called rust inhibitors, suppress the deterioration of metal parts that come into contact with the lubricating oil composition. Examples of corrosion inhibitors include phosphosulfurized hydrocarbons, and preferably in the presence of alkylated phenols or alkylphenol thioesters, and preferably in the presence of carbon dioxide, phosphosulfurized hydrocarbons and alkaline earth metal oxides or water. Mention may be made of products obtained by reaction with oxides. The phosphosulfurized hydrocarbon comprises a suitable hydrocarbon such as a terpene, a heavy petroleum fraction of a C ₂ to C ₆ olefin polymer such as polyisobutylene, 5% to 30% by weight phosphorus sulfide, It is prepared by reacting at a temperature ranging from 66 ° C. to 316 ° C. for 15 to 15 hours. Neutralization of the phosphosulfurized hydrocarbon may be performed in the manner taught in US Pat. No. 1,969,324, the disclosure of which is hereby incorporated by reference for US patent practices.

Antioxidants, or antioxidants, suppress the tendency of deterioration during use of mineral oil, evident from the formation of oxides, such as sludge and varnish deposits on metal surfaces, and increased viscosity. Examples of the antioxidant include an alkylphenol thioester containing a C ₅ to C ₁₂ alkyl side chain such as calcium nonyl phenate sulfide, barium octyl phenate sulfide, dioctyl phenyl amine, phenyl alpha naphthyl amine, phosphosulfurized or sulfurized hydrocarbon. Alkaline earth metal salts of
Other antioxidants or antioxidants useful in the present invention are as described in US Pat. No. 5,068,047, the disclosure of which is hereby incorporated by reference for US patent practices. And oil-soluble copper compounds.

  The friction modifier functions to impart appropriate friction characteristics to a lubricating oil composition such as an automatic transmission fluid. Representative examples of suitable friction modifiers are U.S. Pat. No. 3,933,659 disclosing fatty acid esters and amides; U.S. Pat. No. 4, describing polyisobutenyl succinic anhydride-aminoalkanol molybdenum complexes. US Pat. No. 4,105,571 disclosing glycerol esters of dimerized fatty acids; US Pat. No. 3,779,928 disclosing alkanephosphonates; reaction formation of phosphonates with oleamide U.S. Pat. No. 3,778,375 disclosing the product; U.S. Pat. No. 3,852,205 disclosing S-carboxyalkylene hydrocarbyl succinimide, S-carboxyalkylene hydrocarbyl succinamic acid and mixtures thereof; Alkyl) alkenyl-succinamic acid or succinimi U.S. Pat. No. 3,879,306 disclosing US Pat. No. 3,932,290 disclosing the reaction product of di- (lower alkyl) phosphite and epoxide; and N- (hydroxyalkyl) alkenyl phosphide phosphorylated U.S. Pat. No. 4,028,258, which discloses alkylene oxide adducts of succinimide. These disclosures by reference are incorporated herein by reference for US patent practice. Preferred friction modifiers include hydrocarbyl substituted succinic acid or succinic esters of acid anhydrides, or their metal salts and thiobis-alkanols as described in US Pat. No. 4,344,853.

The dispersant keeps the oil-insoluble material resulting from oxidation during use suspended in the liquid, thus preventing sludge flocculation and precipitation or deposition on the metal parts. Suitable dispersants include high molecular weight N-substituted alkenyl succinimides, reaction products of oil-soluble polyisobutylene succinic anhydride and ethylene amines such as tetraethylenepentamine and their borates. Of high molecular weight esters (produced by esterifying olefin substituted succinic acid with mono- or polyhydric aliphatic alcohols) or high molecular weight alkylated phenols (produced by condensation of aldehydes such as high molecular weight alkyl substituted phenols, alkylene polyamines and formaldehyde) Mannich base is also useful as a dispersant.
What are known as pour point depressants ("ppd"), or lubricant flow improvers, lower the temperature at which the liquid can flow or be poured. Any suitable pour point depressant known in the art can be used. For example, suitable pour point depressants include, but are not limited to, one or more C ₈ to C ₁₈ dialkyl vinyl acetate copolymers of fumarate, polymethyl methacrylate, alkyl methacrylate, and wax naphthalene. It is done.

Any one or more antifoaming agents can be provided for foam control. Suitable antifoaming agents include polysiloxanes such as silicone oil and polydimethylsiloxane.
Antiwear agents reduce the wear of metal parts. Representative examples of conventional antiwear agents are zinc dialkyldithiophosphates and zinc diallyldithiophosphates that also function as antioxidants.
Surfactants and metal rust inhibitors include metal salts of sulfonic acids, alkylphenols, sulfurized alkylphenols, alkyl salicylates, naphthenates and other oil-soluble mono- and dicarboxylic acids. Highly basic (ie superbasic) metal salts such as highly basic alkaline earth metal sulfonates (especially Ca and Mg salts) are often used as surfactants.
Compositions containing these conventional additives are typically mixed into the base oil in amounts that perform their normal attendant functions. Thus, in a typical formulation, by weight, a VI improver (0.01% to 12%); a corrosion inhibitor (0.01% to 5%); an antioxidant (0.01% to 5%). ); Inhibitor (0.01% to 5%); antifoam (0.001% to 3%); antiwear agent (0.001% to 5%); friction modifier (0.01% to 5) %); Surfactant / rust inhibitor (0.01% to 10%); and base oil.

  If other additives are used, they contain together a concentrate or dispersion of the viscosity index improver (at a high concentration as described herein above) and one or more other additives. It may be desirable, although not necessary, to prepare an additive concentrate, which concentrate can add several additives to the base oil at the same time to form a lubricating oil composition. Means "package". The dissolution of the additive concentrate in the lubricating oil may be facilitated by a solvent and stirring with gentle heating, but this is not essential. The additive package typically includes an appropriate amount of viscosity index improver and optional additional additives that, when the additive package is combined with a predetermined amount of base lubricant, results in the desired concentration in the final composition. Formulated to contain. Thus, the product of the present invention is added to a small amount of base oil or other compatible solvent, along with other desirable additives, typically from 2.5% by weight in total. Form an additive package containing the appropriate proportions of 90 wt%, preferably 5 wt% to 75 wt%, and even more preferably 8 wt% to 50 wt% additive (the rest being base oil) be able to. The final composition can typically use about 10% by weight additive package with the remainder being base oil.

In at least certain embodiments, the lubricating oil composition is based on the total weight of the lubricating oil composition: one or more propylene-based polymers in an amount of 0.1% to 20% by weight; 1% by weight One or more base oils in an amount from 1 to 99% by weight; and one or more dispersants in an amount from 0.01% to 25% by weight, in an amount from 0.01% to 20% by weight One or more other additives may be included. The weight percent is based on the total weight of the oil composition.
In at least certain embodiments, the lubricating oil composition may be from 1.0% to 20%, alternatively from 2.0% to 18%, from 3.0% to 15%, from 5% to 14%. One or more propylene-based polymers can be included in an amount of wt%, or 5.0 wt% to 10 wt%. In one or more embodiments, the amount of the one or more propylene-based polymers in the lubricating oil composition is at least about 0.1 wt%, 0.5 wt%, or 1 wt% And the maximum may be about 10%, 15%, or 20% by weight. In one or more embodiments, the amount of the one or more propylene-based polymers in the lubricating oil composition is at least about 0.1 wt%, 2.0 wt%, or 5 wt% Yes, the maximum can be about 12%, 17%, or 19% by weight. In one or more embodiments, the amount of the one or more propylene-based polymers in the lubricating oil composition is about 1%, about 2%, about 5%, about 7%, It can be about 9% by weight, or about 10% by weight. In one or more embodiments, the amount of the one or more propylene-based polymers in the lubricating oil composition is about 0.5%, about 0.6%, about 0.7% by weight. About 0.8 wt%, about 0.9 wt%, about 1.0 wt%, about 1.2 wt%, about 1.4 wt%, about 1.6 wt%, about 1.8 wt%, or It can be about 2.0% by weight. The weight percent is based on the total weight of the oil composition.

  In at least certain embodiments, the lubricating oil composition is 0.5% to 20% by weight; alternatively 1.0% to 18% by weight; alternatively 3.0% to 15% by weight; alternatively 5% by weight. One or more propylene-based polymers in an amount of 5.0% to 10% by weight; alternatively 1% to 99% by weight; alternatively 50% to 99% by weight; alternatively 53% One or more base oils in an amount of from% to 90% by weight; alternatively from 60% to 90% by weight, or from 60% to 98% by weight. When present, the amount of propylene-based polymer in the oil composition is less than 10 wt%, or less than 9 wt%, or less than 8 wt%, or 7 wt%, based on the total weight of the oil composition %, Or less than 6%, or less than 5%, or less than 4%, or less than 3%, or less than 2%, or less than 1%, or less than 0.5% by weight. The weight percent is based on the total weight of the oil composition.

  In at least certain embodiments, the lubricating oil composition comprises one or more propylene-based polymers, 1% to 99% by weight; alternatively 50% to 99% by weight; alternatively 53% to 90% by weight; Alternatively 60% to 90% by weight; alternatively 60% to 98% by weight of one or more base oils; and 0.5% to 20% by weight; alternatively 0.1% to 20% by weight One or more in an amount of 1.0% to 18%; alternatively 3.0% to 15%; alternatively 5% to 14%; alternatively 5.0% to 10% by weight; A dispersant may be included. When present, the amount of propylene-based polymer in the oil composition is less than 10 wt%, or less than 9 wt%, or less than 8 wt%, or 7 wt%, based on the total weight of the oil composition %, Or less than 6%, or less than 5%, or less than 4%, or less than 3%, or less than 2%, or less than 1%, or less than 0.5% by weight. The weight percent is based on the total weight of the oil composition.

  In at least certain embodiments, the lubricating oil composition comprises one or more propylene-based polymers and 1% to 99% by weight; alternatively 50% to 99% by weight; alternatively 53% to 90% by weight. One or more base oils in an amount of 60% to 90% by weight; and 0.5% to 20% by weight; alternatively 0.1% to 20% by weight; One or more in an amount of 1.0% to 18%; alternatively 3.0% to 15%; alternatively 5% to 14%; alternatively 5.0% to 10% by weight; With dispersant, 0.05% to 10%; alternatively 0.1% to 10%; alternatively 0.7% to 5%; alternatively 0.75% to 5%; It may contain one or more pour point depressant of 3% by weight or from 0.75% by weight; 3% by weight% by weight. When present, the amount of propylene-based polymer in the oil composition is less than 10 wt%, or less than 9 wt%, or less than 8 wt%, or less than 7 wt%, or less than 6 wt%, or It may be less than 5 wt%, or less than 4 wt%, or less than 3 wt%, or less than 2 wt%, or less than 1 wt%, or less than 0.5 wt%. The weight percent is based on the total weight of the oil composition.

  Thickening efficiency is a measure of the thickening ability of a polymer in oil and is defined as follows: TE = 2 / c × ln ((polymer + kv of oil) / (kv of oil)) / ln (2) (c is the concentration of polymer). The thickening efficiency of the lubricating oil composition can be about 1 or more, as defined below. In one embodiment, the range of thickening efficiency of the lubricating oil composition has a lower limit of about 1.1, about 1.2, about 1.3, about 1.4, or about 1.5, and an upper limit of about It can range from 2.5, about 2.6, about 2.7, about 2.8, or about 2.9. In another embodiment, the thickening efficiency of the lubricating oil composition is from about 1.5 to about 2.5.

The Shear Stability Index (SSI) indicates the resistance of the polymer to permanent mechanical shear degradation of the engine. SSI can be determined by passing the polymer-oil solution through a high shear Bosch diesel injector for 30 cycles according to the procedure listed in ASTM D6278. The SSI of the polymer can be calculated from the following equation from the viscosity of the oil without the polymer, and the initial viscosity and shear viscosity of the polymer-oil solution.
SSI = 100 × (v _{(polymer + oil), FRESH-} v _{(polymer + oil), SHEARED} / (v _{(polymer + oil), FRESH-} v _{(oil), FRESH} )
v is the kinematic viscosity measured at 100 ° C. according to ASTM D445. The measured SSI of commercially available viscosity index improver polymers generally ranges from 24 SSI to 50 SSI in order to meet various grades of oil and other performance criteria viscosity requirements imposed by automotive engine manufacturers and industry groups. It is. The range of the SSI of the lubricating oil composition may be about 20, about 22, about 24, about 26, or about 28 with a lower limit and about 40, about 44, about 50, about 55, or about 60 with an upper limit. . In another embodiment, the SSI of the lubricating oil composition is about 20 to 60, preferably about 24 to 45, preferably about 35 to 60, more preferably about 20 to about 50, Or more preferably from about 35 to about 50.

  In one or more embodiments, the fully formulated lubricating oil composition of the present invention has a lower limit of −5 ° C., −8 ° C., −10 ° C., −12 ° C., −15 ° C., −18 ° C. or It remains essentially free-flowing when exposed to low temperature cycles that are −20 ° C. and the upper limit is 5 ° C., 8 ° C., 10 ° C., 12 ° C., 15 ° C., 18 ° C. or 20 ° C. “Essentially free flow” means that there is a negligible and / or undetectable change in flowability (viscosity) when poured from a container. In other embodiments, the lubricating oil composition is less than about 15%, less than about 12%, less than about 10%, about less than about 15% of the initial fluidity of the lubricating oil formulation containing the propylene-based polymer of the present invention. It exhibits a change in fluidity of less than 5%, less than about 3%, less than about 1%, less than about 0.5%, less than about 0.25% or less than about 0.1%.

For any range (upper limit and / or lower limit) described herein, any lower limit value may be combined with any upper limit value to the extent that the basic assumptions of the range in which the combination is described are not violated. (I.e., the lower and upper ranges of weight percent of the components present in the material may be combined in a range that does not result in more than 100% by weight of the total material).
The following further embodiments are considered within the scope of the present invention.

Embodiment A: The lubricating oil composition comprises at least 1 containing from 60% to 98% by weight of propylene derived units and from 2% to 40% by weight of units derived from one or more other alpha olefins. Containing a propylene-based polymer and a base oil, the triad regularity of the propylene-based polymer is greater than 90%, the heat of fusion is less than 80 J / g, and the weight average molecular weight (Mw) measured by GPC is 70,000 to 250,000, and MWD is 2.0 to 2.5.
Embodiment B: The lubricating oil composition of Embodiment A, wherein the propylene-based polymer comprises 70% to 95% by weight propylene derived units and 5% to 30% by weight of one or more other. units derived from alpha olefins.
Embodiment C: The lubricating oil composition of Embodiment A or Embodiment B, wherein the propylene-based polymer comprises 75% to 95% by weight of propylene derived units and 5% to 25% by weight of one or Contains units derived from a plurality of other alpha olefins.

Embodiment D: The lubricating oil composition according to any of Embodiments A to C, wherein the propylene-based polymer comprises 80% to 90% by weight propylene derived units and 5% to 20% by weight. % Of units derived from one or more other alpha olefins.
Embodiment E: The lubricating oil composition according to any of Embodiments A to D, wherein the propylene-based polymer is 80% to 90% by weight propylene derived units and 10% to 20% by weight 1 Contains units derived from one or more other alpha olefins.
Embodiment F: The lubricating oil composition according to any of Embodiments A to E, wherein the propylene-based polymer comprises 80% to 88% by weight propylene derived units and 12% to 20% by weight. % Of units derived from one or more other alpha olefins.

Embodiment G: The lubricating oil composition according to any of Embodiments A to F, wherein the alpha olefin is ethylene.
Embodiment H: The lubricating oil composition according to any of Embodiments A to G, wherein the alpha olefin is butene.
Embodiment I: The lubricating oil composition of any of Embodiments A through H, wherein the one or more other α-olefins are one or more C ₄ to C ₁₂ α-. Contains olefins.
Embodiment J: The lubricating oil composition of any of Embodiments A through I, wherein the propylene-derived unit is isotactic.

Embodiment K: The lubricating oil composition of any of Embodiments A through J, wherein the weight average molecular weight (Mw) is from about 80,000 to about 200,000.
Embodiment L: The lubricating oil composition of any of Embodiments A through K, wherein the weight average molecular weight (Mw) is from about 100,000 to about 160,000.
Embodiment M: The lubricating oil composition of any of Embodiments A through L, wherein the weight average molecular weight (Mw) is from about 100,000 to about 150,000.
Embodiment N: The lubricating oil composition according to any of Embodiments A to M, wherein the MWD is 2.1 to 2.4.

Embodiment O: The lubricating oil composition of any of Embodiments A through N, wherein the propylene-based polymer contains 10 wt% to 20 wt% ethylene derived units.
Embodiment P: The lubricating oil composition of any of Embodiments A through O, wherein the MFR (2.16 kg, 230 ° C.) of the propylene-based polymer as measured by ASTM-D1238 is 3 0.0 g / 10 min to about 21 g / 10 min.
Embodiment Q: The lubricating oil composition described in any of Embodiments A through P further contains one or more dispersants.
Embodiment R: The lubricating oil composition according to any of Embodiments A to Q further contains one or more pour point depressants.

  Embodiment S: The lubricating oil composition is based on 0.5% to 15% by weight of at least one propylene-based polymer and the total weight of the lubricating oil composition, based on the total weight of the lubricating oil composition. 60 wt.% To 98 wt.% Of base oil, 0.1 wt.% To 20 wt.% Of one or more dispersants, based on the total weight of the lubricating oil composition, and the lubricating oil composition. Containing from 0.1 wt% to 10 wt% of one or more pour point depressants, based on the total weight, the propylene-based polymer comprising 70 wt% to 95 wt% propylene derived units and 5 wt% Containing 30% to 30% by weight of units derived from one or more other alpha olefins, the heat of fusion of the propylene-based polymer is less than 80 J / g, and the weight average molecular weight measured by GPC ( Mw) 100,000 is 150,000, MWD of 2.5 from 2.0.

Embodiment T: The lubricating oil composition of Embodiment S, wherein the MFR (2.16 kg, 230 ° C.) of the propylene-based polymer, as measured by ASTM-D1238, is from 3.0 g / 10 min to about 21 g / 10 min. It is.
Embodiment U: The lubricating oil composition of Embodiment S or Embodiment T, wherein the thickening efficiency of the oil composition is about 1.5 to 2.5, and the thickening efficiency is defined as follows: : TE = 2 / c × ln ((polymer + kv of oil) / (kv of oil)) / ln (2). (C is the concentration of the propylene-based polymer.)
Embodiment V: The lubricating oil composition according to any of Embodiment S to Embodiment U, wherein the oil composition has a shear stability index of from about 20 to about 60.

  Embodiment W: A lubricating oil composition comprising 0.5% to 15% by weight of at least one propylene-based polymer and a base oil, based on the total weight of the lubricating oil composition, the propylene The base polymer contains 80% to 88% by weight propylene derived units and 12% to 20% by weight units derived from one or more other alpha olefins, the triad rule of the propylene based polymer The melting property is 90% or more, the heat of fusion is less than 80 J / g, the weight average molecular weight (Mw) measured by GPC is 100,000 to 250,000, and the MWD is 2.0 to 2.5. is there.

Embodiment X: The lubricating oil composition of Embodiment W, wherein the propylene-based polymer is present in an amount of 1.0% to 10% by weight, based on the total weight of the lubricating oil composition.
Embodiment Y: The lubricating oil composition of Embodiment W or Embodiment X, further comprising one or more dispersants.
Embodiment Z: The lubricating oil composition according to any of Embodiments W to Y, further comprising one or more pour point depressants.

  Embodiment AA: The lubricating oil composition is based on 0.5 wt% to 15 wt% of at least one propylene-based polymer, based on the total weight of the lubricating oil composition, and on the total weight of the lubricating oil composition. 60% to 98% by weight of the base oil, 0.1% to 20% by weight of one or more dispersants, based on the total weight of the lubricating oil composition, and the total lubricating oil composition Containing 0.1% to 10% by weight of one or more pour point depressants, based on weight, the propylene-based polymer comprising 80% to 88% by weight propylene derived units and 12% by weight Containing 20% by weight of units derived from one or more other alpha olefins, the propylene-based polymer has a triad regularity of 90% or more, a heat of fusion of less than 80 J / g, By The weight average molecular weight measured Te (Mw) of a 250,000 from 100,000, MWD of 2.5 from 2.0.

Embodiment BB: The lubricating oil composition of Embodiment AA, wherein the MFR (2.16 kg, 230 ° C.) of the propylene-based polymer as measured by ASTM-D1238 is from 3.0 g / 10 min to about 21 g / 10 min. It is.
Embodiment CC: The lubricating oil composition of Embodiment AA or Embodiment BB, wherein the thickening efficiency of the oil composition is about 1.5 to 2.5, where the thickening efficiency is defined as follows: Is done. TE = 2 / c × ln ((polymer + kv of oil) / (kv of oil)) / ln (2), where c is the concentration of the propylene-based polymer.

Embodiment DD: The lubricating oil composition of any of Embodiments AA to CC, wherein the oil composition has a shear stability index of about 20 to about 60.
Embodiment EE: The lubricating oil composition of any of Embodiments AA to DD, wherein the oil composition has a shear stability index of from about 20 to about 50.
Embodiment FF: The lubricating oil composition of any of Embodiments AA to EE, wherein the oil composition has a shear stability index of from about 24 to about 45.

^*ＰＡＲＡＴＯＮＥ（登録商標）８９００ はシェブロンオロナイト社（Ｃｈｅｖｒｏｎ Ｏｒｏｎｉｔｅ Ｃｏｍｐａｎｙ、ＬＬＣ）から市販されている。 Examples The above discussion can be further described with reference to the following non-limiting examples. In accordance with one or more described embodiments, lubricating oil compositions are provided that contain at least one propylene-based polymer as a viscosity index improver. Table 1 shows the propylene-based polymers used to formulate the lubricating oils of the following examples. The propylene-based polymer is available from ExxonMobil Chemical.

^* PARATONE® 8900 is commercially available from Chevron Oronite Company, LLC.

Table 2 summarizes the thickening efficiency (TE) and shear stability index (SSI) of the polymers of Table 1 in API Group I oil. The polymer concentration for measuring SSI and TE is 1.5% by weight. The kinematic viscosity of API Group I oil was 6.062 cSt at 100 ° C.
As discussed above, thickening efficiency is a measurement of the thickening properties of a polymer in oil and is defined as follows: TE = 2 / c × ln ((polymer + oil kv) / (oil kv)) / ln (2) (c is the polymer concentration) SSI is the resistance of the polymer to permanent mechanical shear degradation of the engine Indicates. SSI can be determined by passing the polymer-oil solution through a high shear Bosch diesel injector for 30 cycles according to the procedure listed in ASTM D6278. The SSI of the polymer can be calculated from the following equation from the viscosity of the oil without the polymer, and the initial viscosity and shear viscosity of the polymer-oil solution.
SSI = 100 × (v _{(polymer + oil), FRESH-} v _{(polymer + oil), SHEARED} / (v _{(polymer + oil), FRESH-} v _{(oil), FRESH} )
(V is the kinematic viscosity at 100 ° C. according to ASTM D445.)

Five lubricating oil compositions (Examples 1-5) and one comparative oil composition (Comparative Example 1) were prepared in accordance with one or more described embodiments. To prepare the examples, the polymer was dissolved in API Group I oil. The Group I oil composition was a blend of 150 N and 400 NAPI Group I base oil with a kinematic viscosity KV of about 6.5 cSt at 100 ° C. Dispersant packages from Chevron Oronite Company, LLC were added in various amounts as shown in Table 3 below. Next, a cold cranking simulator (CCS) test was measured according to ASTM D5293 at −20 ° C. CCS is used to evaluate the cold cranking characteristics of lubricants at low temperatures.

Next, ten oil compositions (Examples 6-15) containing a pour point depressant ("PPD") and a comparative oil composition (Comparative Example 2) were prepared. PPD was added to the polymer and oil composition, and the oil kinematic viscosity (KV), mini rotational viscosity (MRV), yield stress (YS), and pour point properties were examined. Pour point depressants are available from Evonik RohMax Inc. (VISCOPLEX ^™ 1-330 or VISCOPLEX ^™ 1-3205, commercially available from Horsham, Pennsylvania, USA).

Table 4 is a summary of the oil compositions of Examples 6-15 and Comparative Example 2, each containing a pour point depressant, resulting in kinematic viscosity (KV), mini-rotational viscosity (MRV). , Yield stress (YS), and pour point, and their properties. Viscosity (KV) was measured according to ASTM D445. The pour point was measured according to ASTM D-97. MRV was measured according to ASTM D4684 to evaluate the pump performance of the oil pump at low temperatures. Yield stress was measured according to ASTM D4684.

  According to the data, propylene-based polymers with low α-olefin content, ie, α-olefin content of about 15.5 wt% or less, surprisingly surprisingly have increased oil thickening properties, shear stability and It has been shown that the low temperature viscosity properties are improved. The propylene-based polymer was also surprisingly surprising that the lubricating oil composition showed better low temperature performance due to its low interaction with the wax in the oil.

  For convenience, various specific test procedures have been set forth above to determine specific properties such as tensile set, percent elongation at break, Shore hardness, and toughness. However, if one of ordinary skill in the art reads this patent application and attempts to determine whether the composition or polymer has the specific properties recited in the claims, a clearly identified procedure is preferred, It can be characterized by any published or well-known method or test procedure. It should be understood that any claim may be configured to include the results of any such procedure, although different procedures may produce different results or measurements. Thus, those skilled in the art will anticipate experimental variations in the measurement characteristics reflected in the claims. All numerical values can generally be considered as values described as “about” or “approximately” in terms of the nature of the test.

Certain embodiments and features are described using a set of numerical upper limits and a set of numerical lower limits. Of course, unless stated otherwise, ranges from any lower limit to any upper limit are envisaged. Certain lower limits, upper limits and ranges are expressed in one or more of the claims below. All numerical values are given as “about” or “approximately” and take into account experimental errors and variations that would be expected by one skilled in the art.
If a term used in the claims is not defined above, the broadest definition that one of ordinary skill in the art will give to that term is reflected in at least one publication or issued patent. Should be given. In addition, all patents, test procedures, and other documents cited in this application are all jurisdictions in which such incorporation is permitted and are hereby incorporated by reference to the extent not inconsistent with this application. Incorporated.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the scope of the invention, which falls within the scope of the invention Determined by the claims.

Hereinafter, embodiments of the present invention will be described.
1. At least one propylene-based polymer containing from 60% to 98% by weight of propylene-derived units and from 2% to 40% by weight of units derived from one or more other alpha olefins, the triad Regularity is 90% or more, heat of fusion is less than 80 J / g, weight average molecular weight (Mw) measured by GPC is 70,000 to 250,000, and MWD is 2.0 to 2.5. A propylene-based polymer which is
A lubricating oil composition containing a base oil.
2. The lubricating oil composition according to the above 1, wherein
The lubricating oil composition wherein the propylene-based polymer contains 70 wt% to 95 wt% propylene derived units and 5 wt% to 30 wt% units derived from one or more other alpha olefins.
3. The lubricating oil composition according to the above 1, wherein
Lubricating oil composition wherein the propylene-based polymer contains 75% to 95% by weight of propylene derived units and 5% to 25% by weight of units derived from one or more other alpha olefins.
4). The lubricating oil composition according to the above 1, wherein
The lubricating oil composition wherein the propylene-based polymer contains 80% to 90% by weight of propylene derived units and 5% to 20% by weight of units derived from one or more other alpha olefins.
5. The lubricating oil composition according to the above 1, wherein
The lubricating oil composition wherein the propylene-based polymer contains 80% to 90% by weight of propylene derived units and 10% to 20% by weight of units derived from one or more other alpha olefins.
6). The lubricating oil composition according to the above 1, wherein
The lubricating oil composition wherein the propylene-based polymer contains 80% to 88% by weight of propylene derived units and 12% to 20% by weight of units derived from one or more other alpha olefins.
7). The lubricating oil composition according to the above 1, wherein
The lubricating oil composition, wherein the α-olefin is ethylene.
8). The lubricating oil composition according to the above 1, wherein
A lubricating oil composition wherein the alpha olefin is butene.
9. The lubricating oil composition according to the above 1, wherein
The one or more other alpha olefins are one or more C _Four To C ₁₂ A lubricating oil composition containing an α-olefin.
10. The lubricating oil composition according to the above 1, wherein
A lubricating oil composition wherein the propylene derived unit is isotactic.
11. The lubricating oil composition according to the above 1, wherein
A lubricating oil composition having a weight average molecular weight (Mw) of about 80,000 to about 200,000.
12 The lubricating oil composition according to the above 1, wherein
A lubricating oil composition wherein the weight average molecular weight (Mw) is from about 100,000 to about 160,000.
13. The lubricating oil composition according to the above 1, wherein
The lubricating oil composition wherein the weight average molecular weight (Mw) is from about 120,000 to about 150,000.
14 The lubricating oil composition according to the above 1, wherein
The lubricating oil composition wherein the MWD is 2.1 to 2.4.
15. The lubricating oil composition according to the above 1, wherein
The lubricating oil composition wherein the propylene-based polymer contains 10 wt% to 20 wt% ethylene derived units.
16. The lubricating oil composition according to the above 1, wherein
A lubricating oil composition wherein the propylene-based polymer has an MFR (2.16 kg, 230 ° C.) of 3.0 g / 10 min to about 21 g / 10 min as measured by ASTM-D1238.
17. The lubricating oil composition according to the above 1, wherein
A lubricating oil composition further comprising one or more dispersants.
18. The lubricating oil composition according to the above 1, wherein
A lubricating oil composition further comprising one or more pour point depressants.
19. 0.5% to 15% by weight of at least one propylene-based polymer, based on the total weight of the lubricating oil composition, 70% to 95% propylene derived units and 5% to 30% by weight. % Of units derived from one or more other alpha olefins, with a heat of fusion of less than 80 J / g and a weight average molecular weight (Mw) measured by GPC of 100,000 to 150,000 A propylene-based polymer having a MWD of 2.0 to 2.5;
60% to 98% by weight of base oil, based on the total weight of the lubricating oil composition;
From 0.1% to 20% by weight of one or more dispersants, based on the total weight of the lubricating oil composition;
A lubricating oil composition comprising from 0.1 wt% to 10 wt% of one or more pour point depressants, based on the total weight of the lubricating oil composition.
20. 20. The lubricating oil composition as described in 19 above,
A lubricating oil composition wherein the propylene-based polymer has an MFR (2.16 kg, 230 ° C.) of 3.0 g / 10 min to about 21 g / 10 min as measured by ASTM-D1238.
21. The lubricating oil composition according to the above 20, wherein
The oil composition has a thickening efficiency of about 1.5 to 2.5, and the thickening efficiency is defined as follows.
TE = 2 / c × ln ((polymer + kv of oil) / (kv of oil)) / ln (2)
(C is the concentration of the propylene-based polymer.)
22. The lubricating oil composition according to the above 20, wherein
A lubricating oil composition wherein the oil composition has a shear stability index of from about 20 to about 60.
23. 0.5% to 15% by weight of at least one propylene-based polymer, based on the total weight of the lubricating oil composition, 80% to 88% by weight of propylene-derived units and 12% to 20% by weight. % Of a unit derived from one or more other α-olefins, a triad regularity of 90% or more, a heat of fusion of less than 80 J / g, and a weight average molecular weight measured by GPC (Mw ) From 100,000 to 250,000 and a MWD from 2.0 to 2.5;
A lubricating oil composition containing a base oil.
24. The lubricating oil composition according to the above 23, wherein
A lubricating oil composition wherein a propylene-based polymer is present in an amount of 1.0 wt% to 10 wt%, based on the total weight of the lubricating oil composition.
25. The lubricating oil composition according to the above 23, wherein
A lubricating oil composition further comprising one or more dispersants.
26. The lubricating oil composition according to the above 23, wherein
A lubricating oil composition further comprising one or more pour point depressants.
27. At least one propylene-based polymer containing from 0.5% to 15% by weight, based on the total weight of the lubricating oil composition, from 80% to 88% by weight propylene-derived units and from 12% by weight Weight average molecular weight as measured by GPC, containing 20% by weight of units derived from one or more other alpha olefins, having a triad regularity of 90% or more, a heat of fusion of less than 80 J / g A propylene-based polymer having an (Mw) of 100,000 to 250,000 and an MWD of 2.0 to 2.5;
60% to 98% by weight of base oil, based on the total weight of the lubricating oil composition;
From 0.1% to 20% by weight of one or more dispersants, based on the total weight of the lubricating oil composition;
A lubricating oil composition comprising from 0.1 wt% to 10 wt% of one or more pour point depressants, based on the total weight of the lubricating oil composition.
28. 29. The lubricating oil composition according to 28 above,
A lubricating oil composition wherein the propylene-based polymer has an MFR (2.16 kg, 230 ° C) of 3.0 g / 10 min to about 21 g / 10 min as measured by ASTM-D1238.
29. 29. The lubricating oil composition according to 28 above,
The oil composition has a thickening efficiency of about 1.5 to 2.5, and the thickening efficiency is defined as follows.
TE = 2 / c × ln ((polymer + kv of oil) / (kv of oil)) / ln (2)
(C is the concentration of the propylene-based polymer.)
30. 29. The lubricating oil composition according to 28 above,
A lubricating oil composition wherein the oil composition has a shear stability index of from about 20 to about 60.
31. 29. The lubricating oil composition according to 28 above,
A lubricating oil composition wherein the oil composition has a shear stability index of from about 20 to about 50.
32. 29. The lubricating oil composition according to 28 above,
A lubricating oil composition wherein the oil composition has a shear stability index of from about 24 to about 45.

Claims (10)

At least one propylene-based polymer containing 60% to 98% by weight of propylene-derived units and 2% to 40% by weight of units derived from one or more other alpha olefins, wherein the triad regularity Is 90% or more, the heat of fusion is less than 80 J / g, the weight average molecular weight (Mw) measured by GPC is 70,000 to 250,000, and the MWD is 2.0 to 2.5. A propylene-based polymer;
Base oil ,
From 0.1% to 20% by weight of one or more dispersants, based on the total weight of the lubricating oil composition;
A lubricating oil composition comprising from 0.1 wt% to 10 wt% of one or more pour point depressants, based on the total weight of the lubricating oil composition. The lubricating oil composition according to claim 1,
The lubricating oil composition wherein the propylene-based polymer contains 70% to 95% by weight of propylene derived units and 5% to 30% by weight of units derived from one or more other alpha olefins. The lubricating oil composition according to claim 1 or 2,
A lubricating oil composition wherein the propylene-based polymer has an MFR (2.16 kg, 230 ° C) of 3.0 g / 10 min to 21 g / 10 min as measured by ASTM-D1238. The lubricating oil composition according to any one of claims 1 to 3,
The lubricating oil composition, wherein the α-olefin is ethylene. 0.5% to 15% by weight of at least one propylene-based polymer, based on the total weight of the lubricating oil composition, 70% to 95% propylene derived units and 5% to 30% by weight. % Of units derived from one or more other alpha olefins, with a heat of fusion of less than 80 J / g and a weight average molecular weight (Mw) measured by GPC of 100,000 to 150,000 A propylene-based polymer having a MWD of 2.0 to 2.5;
60% to 98% by weight of base oil, based on the total weight of the lubricating oil composition;
From 0.1% to 20% by weight of one or more dispersants, based on the total weight of the lubricating oil composition;
A lubricating oil composition comprising from 0.1 wt% to 10 wt% of one or more pour point depressants, based on the total weight of the lubricating oil composition. The lubricating oil composition according to any one of claims 1 to 5, wherein
The lubricating oil composition has a thickening efficiency of 1.5 to 2.5, and the thickening efficiency is defined as follows.
TE = 2 / c × ln ((polymer + kv of oil) / (kv of oil)) / ln (2)
(C is the concentration of the propylene-based polymer.) The lubricating oil composition according to any one of claims 1 to 6,
A lubricating oil composition wherein the propylene-based polymer contains no more than 15.5% by weight of units derived from one or more other alpha olefins. The lubricating oil composition according to any one of claims 1 to 7,
A lubricating oil composition grafted using a graft monomer wherein the propylene-based polymer is at least one ethylenically unsaturated carboxylic acid or acid derivative. The lubricating oil composition according to any one of claims 1 to 8,
A lubricating oil composition wherein the propylene-based polymer is grafted using from 1% to 3% by weight of at least one maleic acid or maleic anhydride. A method for preparing a lubricating oil composition according to any one of claims 1-9,
A process comprising (i) mixing a propylene-based polymer with (ii) a base oil.