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Process for producing polyolefins

A polymerization method and olefin technology, applied in the field of polyolefin production, can solve the problem of particle size growth

Inactive Publication Date: 2003-03-26
WESTLAKE LONGVIEW
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the fine particles retain their activity, the polymerization reaction will continue and the particle size will grow leading to the formation of agglomerates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0066] In the following examples, the analytical properties of the polyolefins of the present invention will be evaluated using the test procedures outlined below.

[0067] a) Density is measured in accordance with ASTM D-4883 from test panels manufactured in accordance with ASTM D1928;

[0068] b) Melt Index (MI), I 2 , according to ASTM D-1238, condition E, measured at 190°C and expressed in decigrams per minute (dg / min);

[0069] c) High Load Melt Index (HLMI), I 21 , according to ASTM D-1238, condition F, measured under the condition of 10 times (load) of the weight used in the above melt index (MI) test;

[0070] d) Melt flow rate (MFR) = I 21 / I 2 or high load melt index / melt index;

[0071] e) Residual titanium content in the product. The residual titanium content in the product was measured by X-ray fluorescence spectrometry (XRF) using a Philips Sequential X-ray fluorescence spectrometer, model PW 1480. The polymer sample to be evaluated was compression molded ...

example 1

[0072] The Ziegler-Natta catalyst used in Example 1 was prepared according to Example 1-a of European Patent Application EP 0703 246 A1. The catalyst was used in the form of a prepolymer prepared according to Example 1-b of European Patent Application EP 0 703 246 A1. A prepolymer containing about 34 g of polyethylene per mmol of titanium is thus obtained.

[0073] aggregation method

[0074] The polymerization process employed in Example 1 was carried out here in a fluidized bed reactor for gas phase polymerization consisting of a vertical cylinder with a diameter of 0.74 m and a height of 7 m and a velocity reduction chamber at the top. In the lower part of the reactor there is a fluidization grid and an external pipe for gas circulation, which connects the top of the deceleration chamber to a point in the lower part of the reactor below the fluidization grid. The circulation pipe is equipped with a compressor for circulating the gas and heat transfer means such as a heat ...

example 2

[0082] Follow the procedure of Example 1 with the following exceptions. The Ziegler-Natta catalyst used in Example 2 was supplied by Toho Titanium Corporation under the product name THC-C. The catalyst is a titanium based catalyst supported by magnesium chloride. The catalyst is added directly to the polymerization medium. Trimethylaluminum was added to the polymerization medium as a cocatalyst. The catalyst addition rate and cocatalyst addition rate were adjusted to produce about 200 pounds of polymer product per hour with a residual titanium content of about 1 ppm.

[0083] In addition, C 6 / C 2 and H 2 / C 2 The molar ratios were adjusted to produce an ethylene / 1-hexene copolymer having a target melt index of about 0.6 dg / min and a target density of about 0.920 g / cc.

[0084] Determine the electrostatic charge level in the polymerization reactor. Then, nitrous oxide was added to the polymerization medium and a reduction in static charge levels was expected.

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PUM

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Abstract

A novel process for producing homopolymers and interpolymers of olefins which involves contacting an olefin and / or an olefin and at least one or more other olefin(s) under polymerization conditions with a Ziegler-Natta catalyst and dinitrogen monoxide in an amount sufficient to reduce the electrostatic charge in the polymerization medium. Also provided is a process for reducing electrostatic charge in the polymerization of an olefin by adding dinitrogen monoxide.

Description

technical field [0001] The present invention relates to a polymerization process for the production of polyolefins using a Ziegler-Natta catalyst and nitrous oxide in an amount sufficient to reduce static charges in the polymerization reactor. The use of nitrous oxide as a catalyst also provides polyolefins suitable for molding and film applications. Background of the invention [0002] Polyolefins such as polyethylene are well known and used in many fields. Linear polyethylene polymers, in particular, have properties that distinguish them from other polyethylene polymers such as branched ethylene homopolymers commonly known as LDPE (low density polyethylene). Some of these properties are described in US Patent 4,076,698 to Anderson et al. [0003] A particularly useful polymerization medium for the production of polyethylene and polypropylene polymers is the gas phase process. Examples thereof can be found in US Patents 3,709,853, 4,003,712, 4,011,382, 4,302,566, 4,543,3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/642C08F4/648C08F10/00C08F210/16
CPCC08F10/00Y10S526/901C08F210/16C08F2/005C08F210/14C08F2500/12C08F10/02C08F4/602C08F4/611C08F4/6093C08F2/34
Inventor R·R·福特J·J·范德比尔特R·L·怀特菲尔德G·E·莫雷
Owner WESTLAKE LONGVIEW
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