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Viscosity index improver, method for producing same, and oil composition

Inactive Publication Date: 2015-10-08
KURARAY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a viscosity index improver that can improve the viscosity index and high-temperature high-shear viscosity of oils. This improver can be easily produced and used to enhance the viscosity index and high-temperature high-shear viscosity of oils.

Problems solved by technology

Meanwhile, PTL4 and PTL5 describe a polymer of β-farnesene, but fail to make a sufficient study on practical properties thereof.

Method used

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  • Viscosity index improver, method for producing same, and oil composition

Examples

Experimental program
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Effect test

example 1

[0101]A pressure reaction vessel previously purged with nitrogen and then dried was charged with 62.4 kg of cyclohexane as a solvent and 51.0 g of sec-butyl lithium (in the form of a 10.5% by mass cyclohexane solution) as an anionic polymerization initiator. The contents of the reaction vessel were heated to 50° C., and then 2.34 kg of styrene (1) was added thereto, followed by polymerizing the contents of the reaction vessel for 1 h. Successively, 10.9 kg of β-farnesene was added to the reaction vessel, followed by polymerizing the contents of the reaction vessel for 2 h. Furthermore, 2.34 kg of styrene (2) was added to the reaction vessel, followed by polymerizing the contents of the reaction vessel for 1 h, thereby obtaining a reaction solution containing a polystyrene-poly(β-farnesene)-polystyrene triblock copolymer. Added into the reaction solution was palladium carbon (amount of palladium supported: 5% by mass) as a hydrogenation catalyst which was used in an amount of 5% by m...

example 2

[0103]A pressure reaction vessel previously purged with nitrogen and then dried was charged with 62.4 kg of cyclohexane as a solvent and 40.6 g of sec-butyl lithium (in the form of a 10.5% by mass cyclohexane solution) as an anionic polymerization initiator. The contents of the reaction vessel were heated to 50° C., and then 13.0 kg of β-farnesene was added thereto, followed by polymerizing the contents of the reaction vessel for 2 h. Successively, 2.59 kg of styrene was added to the reaction vessel, followed by polymerizing the contents of the reaction vessel for 1 h, thereby obtaining a reaction solution containing a poly(β-farnesene)-polystyrene diblock copolymer. Added into the reaction solution was palladium carbon (amount of palladium supported: 5% by mass) as a hydrogenation catalyst which was used in an amount of 5% by mass on the basis of the block copolymer, and the block copolymer was subjected to hydrogenation reaction under a hydrogen pressure of 2 MPa at a temperature ...

example 3

[0105]The same procedure as in Example 2 was repeated except that the respective components were formulated as shown in Table 1, thereby obtaining a hydrogenated block copolymer (A3) and an oil composition and subjecting the resulting products to the above evaluation. The results are shown in Tables 1 and 2.

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Abstract

The present invention provides a viscosity index improver that is excellent in an effect of improving a viscosity index and a high-temperature high-shear viscosity of oils, etc. The viscosity index improver of the present invention includes a hydrogenated product of a copolymer containing a constitutional unit (a) derived from an aromatic vinyl compound and a constitutional unit (b) derived from a conjugated diene, a content of a constitutional unit (b1) derived from farnesene in a whole amount of the constitutional unit (b) derived from the conjugated diene being from 1 to 100% by mass, and a content of a constitutional unit (b2) derived from a conjugated diene other than farnesene in a whole amount of the constitutional unit (b) derived from the conjugated diene being from 0 to 99% by mass, and 50 mol % or more of carbon-carbon double bonds in the constitutional unit (b) derived from the conjugated diene being hydrogenated.

Description

TECHNICAL FIELD[0001]The present invention relates to a viscosity index improver including a hydrogenated product of a copolymer containing a constitutional unit derived from farnesene, a process for producing the viscosity index improver, and an oil composition containing the viscosity index improver and a base oil.BACKGROUND ART[0002]Hydrogenated products of block copolymers constituted of a polymer block containing a constitutional unit derived from an aromatic vinyl compound and a polymer block containing a constitutional unit derived from a conjugated diene exhibit properties similar to those of vulcanized rubbers without further subjecting the hydrogenated products to vulcanization, i.e., are excellent in damping property, flexibility, rubber elasticity and weather resistance, and therefore have been extensively used in the applications such as sundries, parts for automobiles, various industrial parts, etc.[0003]The hydrogenated products of block copolymers are produced, for e...

Claims

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Application Information

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IPC IPC(8): C10M143/12
CPCC10M143/12C10M143/00C10M2205/04C10N2030/02C10N2040/04C10N2040/08C10N2040/25C10N2030/68C10N2040/042C10M2205/06C10N2060/02
Inventor UEHARA, YOSUKESASAKI, HIROMITSU
Owner KURARAY CO LTD
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