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

A viscosity index improvement and compound technology, applied in the field of viscosity index improvers, can solve problems such as insufficient research on practical physical properties, and achieve the effect of excellent improvement effect

Inactive Publication Date: 2015-06-10
KURARAY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It should be noted that although polymers of β-farnesene are described in Patent Documents 4 and 5, their practical properties have not been sufficiently studied.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0132] 62.4 kg of cyclohexane as a solvent and 51.0 g of sec-butyllithium (10.5% by mass cyclohexane solution) as an anionic polymerization initiator were put into a pressure-resistant container subjected to nitrogen replacement and dried, and the temperature was raised to 50°C. After that, 2.34 kg of styrene (1) was added and polymerized for 1 hour, then 10.9 kg of β-farnesene was added and polymerized for 2 hours, and 2.34 kg of styrene (2) was added and polymerized for 1 hour to obtain A reaction solution comprising polystyrene-poly(β-farnesene)-polystyrene triblock copolymer. To this reaction solution, 5% by mass of palladium on carbon (loaded palladium: 5% by mass) was added as a hydrogenation catalyst relative to the block copolymer, and the reaction was carried out for 10 hours under a hydrogen pressure of 2 MPa and 150°C. . After cooling and releasing the pressure, remove the palladium carbon by filtration, concentrate the filtrate, and then carry out vacuum drying to...

Embodiment 2

[0135] 62.4 kg of cyclohexane as a solvent and 40.6 g of sec-butyllithium (10.5% by mass cyclohexane solution) as an anionic polymerization initiator were put into a pressure-resistant container subjected to nitrogen replacement and dried, and the temperature was raised to 50°C. Afterwards, 13.0 kg of β-farnesene was added and polymerized for 2 hours, and then 2.59 kg of styrene was added and polymerized for 1 hour to obtain a poly(β-farnesene)-polystyrene diblock copolymer the reaction solution. To this reaction solution, 5% by mass of palladium on carbon (loaded palladium: 5% by mass) was added as a hydrogenation catalyst relative to the block copolymer, and the reaction was carried out for 10 hours under a hydrogen pressure of 2 MPa and 150°C. . After cooling and releasing the pressure, the palladium carbon was removed by filtration, the filtrate was concentrated, and then vacuum-dried to obtain the hydrogenated product of poly(β-farnesene)-polystyrene diblock copolymer (h...

Embodiment 3

[0138] A hydrogenated block copolymer (A3) and an oil composition were produced in the same manner as in Example 2, except that the compounding described in Table 1 was followed, and the above-mentioned evaluation was performed. The results are shown in Table 1 and Table 2.

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Abstract

The present invention provides: a viscosity index improver having an excellent effect of improving a viscosity index and a high-temperature high-shear viscosity of an oil; and others. The viscosity index improver according to the present invention comprises a hydrogenation product of a copolymer which contains (a) a structural unit derived from an aromatic vinyl compound and (b) a structural unit derived from a conjugated diene, wherein (b1) a farnesene-derived structural unit is contained in an amount of 1 to 100 mass% and (b2) a structural unit derived from a conjugated diene other than farnesene is contained in an amount of 0 to 99 mass% both relative to the total amount of (b) the structural unit derived from a conjugated diene, and 50 mol% or more of carbon-carbon double bonds in (b) the structural unit derived from a conjugated diene are hydrogenated.

Description

technical field [0001] The present invention relates to a viscosity index improver composed of a hydrogenated product of a copolymer containing a farnesene-derived structural unit, a method for producing the same, and an oil composition comprising the viscosity index improver and a base oil. Background technique [0002] A hydrogenated product of a block copolymer composed of a polymer block containing a structural unit derived from an aromatic vinyl compound and a polymer block containing a structural unit derived from a conjugated diene exhibits properties equivalent to vulcanized rubber Without further vulcanization, it is widely used in daily necessities, automobile parts, various industrial products, etc. due to its excellent shock absorption, flexibility, rubber elasticity, and weather resistance. [0003] Such a hydrogenated block copolymer is obtained, for example, by hydrogenating a block copolymer obtained by sequentially polymerizing an aromatic vinyl compound and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M143/12C10N30/02
CPCC10M143/00C10M143/12C10M2205/04C10N2030/02C10N2040/04C10N2040/08C10N2040/25C10N2030/68C10N2040/042C10M2205/06C10N2060/02
Inventor 上原阳介佐佐木启光
Owner KURARAY CO LTD
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