Star polymer viscosity index improver for oil compositions

A technology of star-shaped polymer and number average molecular weight, which can be used in lubricating compositions, additives, petroleum industry, etc., and can solve problems such as reduced thickening

Inactive Publication Date: 2001-04-11
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These polymers have excellent finishing properties and product oils have very good low temperature properties, but with reduced thickening

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] Table 1

[0041] polymer

step 1

block

step 2

block

step 3

block

step 4

block

Step 1MW

(reality)

Step 2MW

(reality)

Step 3MW

(reality)

Step 4MW

(reality)

Polystyrene content%

Calculate arm-based MW

Melt viscosity 120

℃,MPa-s

I 1 / I 2

1

I 1

S

B

I 2

32,500

10,200

3,300

19,500

15.6

2.8

1.67

2

I 1

S

B

I 2

36,000

5,800

7,300

14,000

9.2

2.2

2.57

3

S

I 1

B

I 2

3,100

26,100

6,000

14,200

6.3

1.6

1.84

4

I 1

B

I 2

--

31,500

4,400

21,400

--

0

1.3

1.47

5

I 1

B

I 2

--

37,600

3,600

13...

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PUM

PropertyMeasurementUnit
viscosity indexaaaaaaaaaa
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Abstract

The present invention includes star polymers which can be used as viscosity index improvers in oil compositions formulated for high performance engines. The star polymers have tetrablock copolymer arms of hydrogenated polyisoprene-polybutadiene-polyisoprene with a block of polystyrene and which provide excellent low temperature performance in lubricating oils, exhibit good thickening efficiency, and are finishable as polymer crumb.

Description

field of invention [0001] This invention relates to a hydrogenated isoprene and butadiene star polymer, and oil compositions containing the star polymer. The present invention more particularly relates to oil compositions having excellent low temperature properties and viscosifying performance and star polymers having excellent finishing properties. Background of the invention [0002] The viscosity of lubricating oil changes with temperature. Oils are generally defined by their viscosity index, which is a function of the oil's viscosity at a specified lower temperature and at a specified upper temperature. The specified lower temperature and the specified upper temperature change from year to year, but at any given time, are fixed in the ASTM test procedure (ASTM D2270). Currently, the lower temperature specified in the test is 40°C and the upper temperature is 100°C. For two engine lubricating oils having the same kinematic viscosity at 100°C, the one with the lower kin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M143/12C08F8/04C08F297/00C08F297/04C08L53/02C10M143/10C10N20/02C10N30/04C10N40/25C10N60/02
CPCC08F297/044C10N2240/101C10M2205/06C08L53/025C10N2240/104C10M143/12C10N2240/106C10N2240/10C10M2205/04C10M143/10C10N2040/25C10N2040/28C10N2040/251C10N2040/255
Inventor R·B·罗兹
Owner SHELL INT RES MAATSCHAPPIJ BV
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