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Application of single-site catalyst in polymerization of ethylene solution

A catalyst and technology in polymerization, applied in the application field of a class of single-site catalysts in ethylene solution polymerization, can solve the problems of loss of polymerization activity and destruction of molecular structure, etc.

Active Publication Date: 2012-09-12
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymerization temperature of the solution polymerization process is generally higher than 130 degrees (higher than the crystallization temperature of polyolefin in solution), which puts forward very high requirements on the thermal stability of the catalyst. Many single-site catalysts (metal complex matter) at such a high temperature, the molecular structure is destroyed and the polymerization activity is lost

Method used

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  • Application of single-site catalyst in polymerization of ethylene solution
  • Application of single-site catalyst in polymerization of ethylene solution
  • Application of single-site catalyst in polymerization of ethylene solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The synthesis of embodiment one complex C-1

[0068] At -78°C, 1.68 g (4 mmol) of ligand L1 in toluene was added to 1.18 g (4.7 mmol) of titanium tetraamine in toluene, and the system was stirred overnight at room temperature. After the reaction, the solvent was removed under reduced pressure, and the crude product was recrystallized in a mixed solvent of toluene and n-hexane to obtain 1.68 g of complex Cl with a yield of 76%. 1 H NMR (300MHz, CDCl 3 ): δ7.41-7.08(m, 9H), 6.78(d, 1H, J=8.4Hz), 6.61(t, 1H, J=7.5Hz), 4.56(s, 2H), 2.89(s, 12H) , 1.42(s, 9H), 1.32(s, 9H).

[0069]

Embodiment 2

[0070] The synthesis of embodiment two complex C-2

[0071] The method is the same as the synthesis of complex C-1 in Example 1, and the yield is 62%. Elemental analysis: measured (calculated) C: 63.29 (64.86); H, 6.37 (6.49); N, 8.47 (8.73).

[0072]

Embodiment 3

[0073] The synthesis of embodiment three complexes C-3

[0074] The method is the same as the synthesis of complex C-1 in Example 1, and the yield is 71%. Elemental analysis: measured (calculated) C, 71.86 (71.88); H, 6.37 (6.36); N, 6.37 (6.10).

[0075]

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Abstract

The invention relates to an application of a single-site catalyst in polymerization of an ethylene solution, namely the application of the single-site catalyst in synthesis of polyethylene and ethylene copolymers through solution polymerization. The catalyst can be conveniently prepared with an organic ligand and titanium tetrachloride. At a temperature of 110 to 160 DEG C and under the action of a catalyst promoter, the catalyst can effectively catalyze ethylene homopolymerization or copolymerization of ethylene with other olefins, and the activity is higher than 10<5> / mol.h.atm.

Description

technical field [0001] The invention relates to the application of a class of single-site catalysts in ethylene solution polymerization. The catalysts are transition metal complexes containing multidentate ligands. Under the action of a co-catalyst, the catalyst can be used to catalyze the homopolymerization of ethylene or the copolymerization of ethylene and α-olefin with high activity in a solution polymerization process. Background technique [0002] The catalyst with a single active site can obtain polyolefins with narrow molecular weight distribution due to the same catalytic active site, which can effectively realize the copolymerization and polymerization of ethylene and other monomers, and can prepare different molecular weights and molecular weight distributions by adjusting the chemical structure of the main catalyst as required. Materials, so as to obtain a variety of high-performance polyolefin materials. However, when the traditional slurry process or gas phase...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F4/642C08F4/643C08F4/649
CPCY02P20/52
Inventor 唐勇万大维孙秀丽李军方
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI