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Process for the polymerization of olefins

A technology of olefins and polymerization reactions, applied in the field of olefins polymerization, can solve the problems of reducing the yield of Ziegler-Natta catalysts, etc.

Inactive Publication Date: 2001-11-28
WESTLAKE LONGVIEW
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while increasing the yield of isotactic polypropylene, electron donors generally tend to decrease the yield of Ziegler-Natta catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The gas phase process conditions are given in Table 1, and the resin properties are given in Table 2. The molar ratio (TMA / Ti) of trimethylaluminum (TMA) to titanium was 3. Chloroform (CHCl 3 ) to the molar ratio of titanium (CHCl 3 / Ti) was 0.03. The operation is carried out without adding an external electron donor. 1-Hexene was used as comonomer. Under these conditions, polyethylene was withdrawn from the reactor at a rate of 150 lb / h (pounds per hour) free of agglomerates. The yield of prepolymer is 375 lbs polyethylene / lbs prepolymer which is equivalent to 2311 g polyethylene with an activity of 2311 g PE / (mmoleTi h 100P C2 )].

[0068] The density of polyethylene is 0.917g / cc, the melt index MI 2.16 ,I 2 It is 0.9dg / min.. Melt flow ratio I 21 / I 2 is 33, and the n-hexane extractable fraction is 2.6 wt%. DSC melt transition temperature (T m ) is 124.5°C.

Embodiment 2

[0070] The gas phase process conditions are given in Table 1, and the resin properties are given in Table 2. The TMA / Ti molar ratio was 7. CHCl 3 The / Ti molar ratio was 0.06. The molar ratio of tetrahydrofuran (THF) to titanium (THF / Ti) was 1. 1-hexene was used as comonomer. Under these conditions polyethylene free of agglomerates was withdrawn from the reactor at a rate of 192 lb / h. The yield of prepolymer is 231 lbs of polyethylene / lbs of prepolymer, which corresponds to an activity of 1800 [gPE / (mmoleTi h 100P C2 )].

[0071] The density of polyethylene is 0.917g / cc, the melt index MI 2.16 ,I 2 It is 0.9dg / min.. Melt flow ratio I 21 / I 2 is 31, and the n-hexane extractable fraction is 2.0 wt%. DSC melt transition temperature (T m ) is 123.9°C.

Embodiment 3

[0073] The gas phase process conditions are given in Table 1, and the resin properties are given in Table 2. The TMA / Ti molar ratio was 7. CHCl 3 The / Ti molar ratio was 0.06. The THF / Ti molar ratio is 1. Nitrous oxide (N 2 O) concentration is 70 ppm (volume). 1-Hexene was used as comonomer. Under these conditions polyethylene free of agglomerates was withdrawn from the reactor at a rate of 180 lb / h. The yield of prepolymer is 79 lbs of polyethylene / lbs of prepolymer, which corresponds to an activity of 609 [gPE / (mmoleTi h 100P C2 )].

[0074] The density of polyethylene is 0.917g / cc, the melt index MI 2.16 ,I 2 It is 0.9dg / min.. Melt flow ratio I 21 / I 2 is 28, and the n-hexane extractable fraction is 1.1 wt%. DSC melt transition temperature (T m ) is 122.3°C.

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Abstract

A novel process for the polymerization of olefins is provided. The process involves contacting at least one olefin with a Ziegler-Natta catalyst in the presence of dinitrogen monoxide in the production of polymeric products having a narrower molecular weight distribution. A process for narrowing molecular weight distribution of polyolefins utilizing dinitrogen monoxide is also provided.

Description

field of invention [0001] The present invention relates to a process for the polymerization of olefins and a process for narrowing the molecular weight distribution (MWD) of polyolefins. Polyethylenes prepared according to the process of the invention are also generally characterized by having a reduced fraction of n-hexane soluble polymers. Background of the invention [0002] Catalyst systems for the polymerization of olefins are known in the art at least since the issue of US Patent No. 3,113,115. Since then, many patents have been published on new or improved Ziegler-Natta catalysts. Examples of such patents are US Pat. [0003] These patents disclose known Ziegler-Natta catalysts generally consisting of a transition metal component and a cocatalyst, usually an organoaluminum compound. As the case may be, activators such as halogenated hydrocarbons and activity modifiers such as electron donors are used with the catalyst. [0004] The use of halogenated hydrocarbons ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/602C08F4/60C08F4/642C08F10/00C08F210/16
CPCY10S526/901C08F210/16C08F10/00C08F4/6493C08F2/005C08F2/40C08F210/14C08F2500/12C08F10/02C08F4/602C08F4/611C08F4/6093C08F2/34
Inventor R·R·福特小R·K·斯图尔特
Owner WESTLAKE LONGVIEW
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