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Continuous extrusion process for producing grafted polymers

A technology of grafted polymers and polymers, applied in the field of functionalized polymers, can solve the problems of being unsuitable for high functionalization, reducing molecular weight, and not being able to obtain high functionality

Inactive Publication Date: 2008-01-30
LANXESS CORP (CA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High functionality cannot be obtained
In addition there is no disclosure of shearing that results in a decrease in molecular weight
This method is therefore not suitable for achieving high functionalization and reduced molecular weight in a single continuous extrusion reactor

Method used

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  • Continuous extrusion process for producing grafted polymers
  • Continuous extrusion process for producing grafted polymers
  • Continuous extrusion process for producing grafted polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0089] Example 2: Comparison

[0090] The effect of molecular weight reduction by shear modification prior to grafting polymers was tested in a continuous extrusion reactor comprising two extruders connected in series. The purpose of the trials was to investigate the feasibility of carrying out molecular weight reduction and grafting together in a single continuous extrusion reactor. Table 4 shows the processing sections and corresponding operating conditions for each extruder.

[0091] Table 4: Processing section and operating conditions of Example 2

[0092] Extruder #1

[0093] The graft polymer produced with the above operating conditions has the following characteristics:

[0094] Table 5: Properties of the graft polymer produced in Example 2

[0095] Bound maleic anhydride (wt%)

[0096] Example 2 shows that no grafting was measured when the polymer was first sheared to reduce its molecular weight and then functionalized. One explanation for thi...

Embodiment 3

[0097] Example 3: Invention

[0098] The method of the fourth embodiment (as shown in Figure 4) is operated. Table 6 shows the processing sections and corresponding operating conditions for each extruder.

[0099] Table 6: Processing section and operating conditions of Example 3

[0100] Extruder #1

[0101] The graft polymer produced with the above operating conditions has the following characteristics:

[0102] Table 7: Characteristics of the grafted polymer produced in Example 3

[0103] Bound maleic anhydride (wt%)

[0104] Example 3 shows that the method according to the fourth embodiment can be used to produce a commercially useful product. High throughput is produced by drying the polymer in the first extruder, connecting the first extruder with a flow diverter to a second extruder where the two reactants are used for injection The incorporation of maleic anhydride and sufficient extruder headroom in the second extruder to achieve a moderate re...

Embodiment 4

[0105] Example 4: Invention

[0106] A method according to a third embodiment (shown in FIG. 3 ) is carried out. By performing the first injection in the first extruder and utilizing a transition section that provides additional reaction residence time, grafted polymers with high amounts of maleic anhydride can be produced with a higher overall efficiency of reactant utilization. Table 8 shows the processing sections and corresponding operating conditions for each extruder.

[0107] Table 8: Processing sections and operating conditions of Example 4

[0108] Extruder #1

[0109] The graft polymer produced with the above operating conditions has the following characteristics:

[0110] Table 9: Properties of the graft polymer produced in Example 4

[0111] Bound maleic anhydride (wt%)

[0112] Example 4 shows that by moving the first reactant injection to the first extruder and by using a transition section to provide additional reactor residence time, a ...

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Abstract

Methods are disclosed for a novel and useful single pass extrusion process for the reactive extrusion and compounding of polymers. Traditional extruders utilized in reactive processes are of length to diameter ratios ranging from 30 to 1 to as high as 56 to 1. The process disclosed uses a series of sequential, very closely-coupled, independently driven screw extruders having a total effective length to diameter ratio much greater than 70 to 1 and as high as 132 to 1 or greater, and providing greatly extended reaction times, separate and multiple introductions of reactive and non-reactive agents and mechanical connections allowing for convenient screw changes and differential thermal expansion. The assembly is employed to economically produce grafted polyolefins, produce ionomers without employing the use of strong caustic agents, remove large volumes of unwanted polymer processing solvents and produce other reacted polymer species in one continuous pass.

Description

technical field [0001] The present invention relates to a continuous process for the production of low molecular weight functionalized polymers, such as functionalized ethylene-propylene rubber (EP-R), by reactive extrusion. This method can be used for rheological modification of polymers, especially for the production of grafted EP rubber with desired rheological properties. Background technique [0002] Functionalized polymers are used as dispersants in lubricating oils to prevent the accumulation of combustion by-products and reduce hydrocarbon emissions. Oil additives need to be shear stable, have low molecular weight and be low cost. An example of an oil additive is the graft polymer ethylene-propylene grafted maleic anhydride (EP-g-MAH). Conventionally, oil additives such as EP-g-MAH are produced in a solution-based process operating in batch reactors. However, in order to improve the economics of the process, it is desirable to be able to produce EP-g-MAH in a cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/78C08F255/04C08F255/02C08J7/14B29C47/12B29C48/03B29C48/29B29C48/295B29C48/30B29C48/38B29C48/385B29C48/395B29C48/40B29C48/76B29C48/875
CPCB29K2075/00B29K2096/04B29C47/0867B29K2105/0005C08F8/00B29C47/76B29K2021/00B29C47/0009B29C47/0004B29K2023/00C08F255/00B29C47/50B29C47/1072B29K2067/00B29C47/1063B29C47/366B29C47/004B29K2101/12B29C48/875B29C48/29B29C48/022B29C48/03B29C48/0011B29C48/2665B29C48/295B29C48/385B29C48/38B29C48/76B29C48/832B29C48/834B29C48/40C08F10/00C08F222/00C08F220/00C08F255/04B29C48/505
Inventor R·科里斯塔J·J·德凯尔J·N·福勒M·T·格拉戈尔J·洛夫格罗夫S·V·费德克
Owner LANXESS CORP (CA)
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