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Multi-step process for producing polypropylene composition

A polymer and propylene technology, which is applied in the field of producing propylene copolymers with a wide molecular weight distribution, and can solve problems such as catalyst activity reduction

Active Publication Date: 2017-07-25
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] These methods have the disadvantage that, for some polymerization catalysts, the activity of the catalyst is reduced when the polymerization is carried out at low hydrogen concentrations
This limits the relative amount of high molecular weight components in the final composition

Method used

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  • Multi-step process for producing polypropylene composition
  • Multi-step process for producing polypropylene composition
  • Multi-step process for producing polypropylene composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0164] Operating in liquid-filled mode at a temperature of 26°C and a pressure of 54 bar has a 45dm 3 capacity stirred tank reactor. A large amount of propylene was fed into the reactor so that its average residence time in the reactor was 0.3 hours, and together with 1.1 g / h of hydrogen and 1.4 g / h of polymerization catalyst, the polymerization catalyst was prepared according to the above catalyst examples prepared with triethylaluminum (TEA) as a cocatalyst and dicyclopentyldimethoxysilane (DCPDMS) as an external donor such that the molar ratio of TEA / Ti was about 388 mol / mol, and the TEA / DCPDMS The molar ratio is 6 mol / mol. The slurry from the polymerization reactor is introduced together with 160kg / h of propylene, 2.7kg / h of ethylene and hydrogen into a volume of 150dm 3 In the loop reactor, the molar ratio of hydrogen to propylene is 0.15mol / kmol. The loop reactor was operated at a temperature of 68°C and a pressure of 53 bar. The production rate of propylene copolyme...

Embodiment 2 and Embodiment 3

[0169] Except that the operating conditions in the loop reactor and the gas phase reactor were changed as shown in Table 1, the operating steps of Example 1 were followed.

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Abstract

The present invention discloses a process for polymerizing propylene by copolymerizing propylene with a comonomer selected from the group of ethylene and C4-C10 α-olefins in three polymerization steps in the presence of a polymerization catalyst. The polymers produced in the three polymerization steps had different melt flow rates and comonomer contents. The polymer composition produced by the method has excellent mechanical properties and can be used to make pipes. This method has good productivity.

Description

technical field [0001] The present invention relates to a process for the production of propylene polymers. In particular, the process relates to a process for the production of propylene copolymers having a broad molecular weight distribution. In particular, the process relates to a process for polymerizing propylene with comonomers in at least three steps. The polymers obtained are very suitable for the production of pipes. Background technique [0002] problem to be solved [0003] It is known in the art to polymerize propylene in two or more steps to produce resins useful for the manufacture of pipes, such as from WO-A-1997040080 and EP-A-887380. These methods often produce high molecular weight copolymers in the first polymerization step and low molecular weight copolymers in subsequent polymerization steps. [0004] These methods have the disadvantage that, for some polymerization catalysts, the activity of the catalyst decreases when the polymerization is carried ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/00C08L23/14
CPCC08L23/142C08L2203/18C08L2205/025C08L2308/00C08L2314/02C08F10/06C08F2/001C08F210/06C08F210/16C08F2500/12
Inventor J·哈托宁保利·莱斯基宁J·利亚S·马丁
Owner BOREALIS AG