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Method of producing highly transparent polypropylene including prepolymerization step

A polypropylene and pre-polymerization technology, applied in the field of polypropylene, can solve the problems of downward bending of the product and reduction of the activity of the polymerization catalyst.

Active Publication Date: 2010-08-18
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this nucleating agent has a problem in that anisotropic shrinkage occurs, or the nucleating agent adheres to the die, mold, or roll, so that the product bows downward
However, this method also has a problem in that the activity of the polymerization catalyst during the polymerization of propylene decreases

Method used

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  • Method of producing highly transparent polypropylene including prepolymerization step
  • Method of producing highly transparent polypropylene including prepolymerization step

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]

[0048] Add 25.25 g of MgCl to a 500 ml glass reactor at 0 °C under nitrogen atmosphere 2 2.8C 2 h 5 OH and 150 ml of heptane anhydride and stirred, and 21.6 ml of 1M diisobutyl phthalate was added and stirring was continued for 10 minutes. Then, add 100ml (0.91mol) of TiCl at 0°C 4 , and reacted at room temperature for 1 hour. In addition, add 150ml (1.36mol) of TiCl 4 , and the temperature was raised to 100° C. and the mixture was reacted for 2 hours. The supernatant was separated and 200 ml (1.82 mol) of TiCl was added at 0 °C 4 . The temperature was raised to 120°C, and the reactants were allowed to react for 2 hours. When the reaction was completed, the solid magnesium-titanium catalyst obtained after filtration was washed 6 times with heptane, and vacuum-dried at 40° C. for 2 hours to prepare the final product, magnesium-titanium catalyst (containing 2.4 wt% titanium).

[0049]

[0050] The 0.5 L reactor was purged with argon at elevated temperature. ...

Embodiment 2

[0054] Polypropylene was prepared in the same manner as described in Example 1 except that 2.63 mmol of trimethylmethoxysilane was added to prepare a prepolymer.

Embodiment 3

[0056] Polypropylene was prepared in the same manner as described in Example 1 except that 4.38 mmol of trimethylmethoxysilane was added to prepare a prepolymer.

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Abstract

Disclosed is a method of preparing a highly transparent polypropylene amprising a step of prepolymerizing an alpha-olefin and a vinyl cyclic saturated hydrocarbon in the presence of a Zegler-Natta catalyst and an external electron donor, wherein a step of adding and pre not polymerizing the alpha-olefin is followed by a step of adding and prepolymerizing the vinyl cyclic saturated hydrocarbon. The method provides polypropylene having superior tacticity and transparency with not decreasing the activity of the polymerization catalyst at the polymerization of propylene.

Description

technical field [0001] The present invention relates to a process for the preparation of highly transparent polypropylene comprising a prepolymerization step of olefins, more precisely to a process for preparing polypropylene with increased stereoregularity without reducing the activity of the polymerization catalyst during the polymerization of propylene. The degree and transparency of the polypropylene method. Background technique [0002] Propylene polymers have good moldability and mechanical strength, and are inexpensive, so they have been used in many fields, however, there is a need to improve rigidity and transparency without destroying the inherent properties of propylene polymers, and to improve the performance of injection molding. High cycle injection moldability. It is known that the above properties can be improved by increasing the crystallization rate of the propylene polymer. [0003] It has been suggested to routinely use some nucleating agents by which t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F2/00
CPCC08F210/06C08F10/06C08F10/00C08F4/6465C08F4/6492C08F4/6543C08F210/16C08F2500/12C08F2500/15C08F2500/26C08F4/64
Inventor 李暖莹朴哲英李镇友李鲁美林东烈
Owner LG CHEM LTD