Process for the polymerization of olefins

An olefin polymerization and olefin technology, applied in the field of polymerization, can solve the problems of low apparent density of polyethylene, reduce the productivity of industrial methods of polyethylene, etc., and achieve the effect of high apparent density

Inactive Publication Date: 2003-05-14
INNOVENE MFG BELGIUM NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The polyethylene obtained in the presence of such known catalytic solids has a rather low apparent density, thereby reducing the productivity of industrial processes for the manufacture of polyethylene using such catalytic solids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0079] Example 1 (reference)

[0080] In this example, ethylene and butene were copolymerized with a solid catalytic complex prepared without subsequent treatment with a halogen-containing organoaluminum compound. a. Preparation of solid catalytic complexes A.1. The first step in liquid complex formation

[0081] Diethoxide magnesium prepared in situ by reacting metal magnesium with ethanol was reacted with titanium tetrabutoxide in such an amount that the molar ratio of titanium to magnesium was equal to 2 at 110° C. for 5 hours. A.2. The second step in the precipitation of liquid complexes

[0082] The liquid complex obtained in A.1. was contacted with a solution of isobutylaluminum dichloride in hexane (in such an amount that the molar ratio of aluminum to titanium was equal to 6) at 45° C. and stirred for 2 hours to precipitate. A.3. mature

[0083] The mixture obtained in A.2. was aged at 60° C. for 45 minutes. A.4. The third step is followed by the washing o...

example 2

[0089] Example 2 (according to the present invention)

[0090] In this example, a co-polymer of ethylene and butene (suitable for the concentration of hydrogen and butene in the method of Example 1.B) was prepared using a solid catalytic complex mixed with the MI of the copolymer of Example 1. 2 and SD values ​​for the solid catalytic complex by means of a single subsequent treatment such that for each alkoxy group (present in magnesium compounds and transition metal compounds) the total amount of chlorine used (for the second and subsequent treatment) sum) equal to the amount used in Example 1 to prepare. a. Preparation of solid catalytic complexes A.1. The first step is to form a liquid complex

[0091] Magnesium diethoxide prepared in situ by reacting metal magnesium with ethanol was reacted with titanium tetrabutoxide (in such an amount that the molar ratio of titanium to magnesium was equal to 1) at 110° C. for 5 hours. A.2. The second step to precipitate the liquid ...

example 3

[0103] Example 3 (according to the present invention)

[0104] In this example, ethylene was polymerized by incorporating a solid catalytic complex containing two different transition metals, the solid catalytic complex being prepared with a single subsequent treatment. a. Preparation of solid catalytic complexes A.1 The first step is to form a liquid complex

[0105] Magnesium diethanate was reacted with titanium tetrabutoxide and zirconium tetrabutoxide in amounts such that the molar ratio of titanium to magnesium equals 0.5 and the molar ratio of zirconium to titanium equals 1.2 at 140° C. for 7 hours. A.2 The second step precipitates the liquid complex

[0106] The liquid complex obtained in A.1 was contacted with dichloroisobutylaluminum (in such an amount that the molar ratio of aluminum to the total amount of titanium and zirconium used was equal to 8.2) at 45° C. and stirred for 90 minutes to precipitate the liquid complex A.3 mature

[0107] The mixture obta...

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PUM

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Abstract

Olefins are polymerised in contact with a catalyst system contg. (a) a solid catalytic complex based on Mg, a transition metal and a halogen, obtd. by (i) reacting (I) an oxygenated organo-Mg cpd. or a halogenated Mg cpd. with (II) an oxygenated organic cpd. or a halogenated cpd. of a transition metal of Gps. IVB or VB, to give a liq. complex, (ii) precipitating. the complex by means of a cpd. of formula AlRnX3-n, to give a solid catalytic complex, (iii) sepg. the solid complex, and (iv) treating the solid complex with a cpd. of formula AlRnX3-n, and (b) an organic cpd. of a metal of Gps. IA, IIA, IIB, IIIA or IVB. R = hydrocarbo gp.; X = halogen; n = less than 3. This method has an effect to improve the apparent density of polyolefin.

Description

Technical field: [0001] The present invention relates to a process for the polymerization of olefins, more precisely in the presence of a catalytic system comprising solid catalytic complexes based on magnesium, transition metals and halogens and organometallic compounds (promoters) . Background technique: [0002] British Patent GB 1464909 discloses a catalytic system comprising a solid based on magnesium, transition metal and halogen and a cocatalyst. In Example 1 of this patent, ethylene is polymerized in the presence of triisobutylaluminum and a catalytic solid which first mixes magnesium ethoxide with tetrabenzyltitanium, to which a halogen-containing organoaluminum compound (di ethylaluminum chloride) until a solid precipitate was obtained. A fresh precipitate was then isolated. [0003] The polyethylene obtained in the presence of such known catalytic solids has a rather low apparent density, thereby reducing the productivity of industrial processes for producing p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F4/658C08F4/60C08F4/635C08F4/642C08F4/6592C08F10/00C08F10/02C08F110/02C08F210/16
CPCC08F10/00C08F110/02C08F10/02C08F210/16C08F4/6355C08F4/6557C08F2500/12C08F210/08
Inventor B·范德施里克C·迪特里兹B·姜
Owner INNOVENE MFG BELGIUM NV
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