Catalyst system and process for olefin polymerization

A technology of catalysts and systems, applied in the field of new catalyst systems, which can solve the problems of not giving specific examples or suggestions of compounds

Inactive Publication Date: 2011-06-29
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also mentioned that substituents can form rings with each other, but no specific examples or suggestions for such compounds are given

Method used

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  • Catalyst system and process for olefin polymerization
  • Catalyst system and process for olefin polymerization
  • Catalyst system and process for olefin polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0260] Polymerization Example 1 (see figure 1 )-batch polymerization of propylene

[0261] at room temperature, in N 2 Under purge, TIBAL (triisobutylaluminum, Aldrich) (0.4 mL, 1.0 M in hexane) was added to the 1 L autoclave, followed by 500 mL of isohexane. Propylene was added in 10 mL increments according to the volume measured by the sight glass. The reaction was heated to temperature, allowed to stabilize and the total reaction pressure was recorded. Catalyst system as a preactivated solution of metallocene and activator in toluene at high pressure N 2 Feed through the catalyst tube while flushing. Rinse and repeat twice. After the polymerization was complete, the reactor contents were cooled to room temperature and the excess pressure was safely vented. Transfer the contents to a glass container and pass the volatiles through N 2 Purify and remove. The polymer was dried in a vacuum oven at 70°C for 2 to 3 hours.

[0262] The metallocenes and activators used i...

Embodiment 2

[0293] Polymerization Example 2 (see Figure 2a , 2b) - continuous polymerization of propylene

[0294] General Polymerization Procedure in Continuous Stirred Tank Reactor: All polymerizations were carried out in a liquid filled single stage continuous reactor system. The reactor was a 0.5-liter stainless steel reactor reactor and was equipped with a stirrer, water cooling / steam heating with thermostat and pressure controller. Solvent, propylene and comonomer were first purified by passing through a three-column purification system. The purification system consisted of an Oxiclear column (model #RGP-R1-500 from Labclear) followed by 5A and 3A molecular sieve columns. Regenerate the purification column periodically whenever there is evidence of low polymerization activity. The 3A and 5A molecular sieve columns were internally regenerated under nitrogen at a setting of 260°C and 315°C, respectively. Molecular sieve material was purchased from Aldrich. Oxiclear columns are...

Embodiment 3

[0310] Polymerization Example 3 (see Figure 3a , 3b) - continuous polymerization of propylene

[0311] Example 3 illustrates the polymerization of propylene using rac-dimethylsilylbis(indenyl)zirconium dimethyl, see Figure 3a and 3b . Using the metallocene with Me 3 NH tetrakis(heptafluoro-2-naphthyl)borate was preactivated in toluene at a molar ratio of about 1:1. The same general polymerization procedure as described above in Example 2 was employed, and the detailed polymerization conditions in these polymerization examples and some analytical data for the material produced are listed in Table 5a. For all polymerization runs, the isohexane feed rate was 80 ml / min, the propylene feed rate was 14 g / min and the metallocene feed rate was 7.835E-07 moles / min. As a comparative example, Table 5b lists the use of rac-dimethylsilane preactivated with dimethylanilinium tetrakis(heptafluoronaphthyl)borate in toluene at a molar ratio of about 1:1. Polymerization conditions and...

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Abstract

The present application relates to a new catalyst system for the polymerization of olefins, comprising a new ionic activator having the formula: [R<1>R<2>R<3>AH]<+>[Y]<->, wherein [Y]<-> is a non-coordinating anion (NCA), A is nitrogen or phosphorus, R<1> and R<2> are hydrocarbyl groups or heteroatom-containing hydrocarbyl groups and together form a first, 3- to 10-membered non-aromatic ring with A, wherein any number of adjacent ring members may optionally be members of at least one second, aromatic or aliphatic ring or aliphatic and / or aromatic ring system of two or more rings, wherein said at least one second ring or ring system is fused to said first ring, and wherein any atom of the first and / or at least one second ring or ring system is a carbon atom or a heteroatom and may be substituted independently by one or more substituents selected from the group consisting of a hydrogen atom, halogen atom C1 to C10 alkyl, C5 to C15 aryl, C6 to C25 arylalkyl, and C6 to C25 alkylaryl, and R<3> is a hydrogen atom or C1 to C10 alkyl, or R<3> is a C1 to C10 alkylene group that connects to said first ring and / or to said at least one second ring or ring system. The present application also relates to a process for the polymerization of olefins, preferably propylene, using this and other catalyst systems, as well as to polymers made by said process.

Description

[0001] inventor: Donna J. Crowther, Peijun Jiang, George Rodriguez [0002] priority statement [0003] This application claims priority to USSN 12 / 184,713, filed August 1, 2008, and EP 08163326.5, filed August 29, 2008. field of invention [0004] The present invention relates to novel catalyst systems comprising a transition metal compound and an activator comprising a non-coordinating anion and a cyclic cation. The present invention also relates to processes for polymerizing olefins using such and related catalyst systems. The invention further relates to the polymers thus produced. Background of the invention [0005] Olefin polymerization catalysts are of great utility in industry. There is therefore interest in discovering new catalyst systems which include enhancing the polymerization activity of the catalyst and enabling the production of polymers with specific properties such as high melting point and high molecular weight. [0006] Catalysts for the polymeriza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F4/6592B01J31/02B01J31/14B01J31/16B01J31/22
CPCC08F110/06C08F4/65912B01J31/0268B01J2531/49C08F10/06B01J2531/48C08F210/16B01J31/2295B01J2231/122C08F4/65916B01J31/1616B01J31/0239C08F4/65927C08F210/06B01J31/146Y10S526/943
Inventor D・J・克劳泽江培军G・罗德里格斯
Owner EXXONMOBIL CHEM PAT INC
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