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Method for producing a propylene polymer having a very high melt flowability

一种丙烯聚合物、丙烯聚合的技术，应用在全同立构丙烯聚合物领域，能够解决氢气反应性降低等问题

Inactive Publication Date: 2008-04-02
SAMSUNG TOTAL PETROCHEMICALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of dialkyldimethoxysilane compounds as external electron donors leads to the problem of a significant reduction in the reactivity of hydrogen

Method used

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  • Method for producing a propylene polymer having a very high melt flowability

Examples

Experimental program
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Effect test

Embodiment 1

[0031] [Preparation of main catalyst component]

[0032] Into a fully nitrogen-purged 1 L glass reactor equipped with a stirrer was added 200 ml of toluene and diethoxymagnesium (25 g, 0.219 mol) and stirred at 250 rpm while maintaining the temperature at 10°C. Add 75ml of titanium tetrachloride to it within 30 minutes, then raise the temperature of the reactor to 110°C at a rate of 0.5°C per minute, during the temperature rise, when the temperature reaches 25°C, further add 7.5ml of phthalic acid Diisobutyl ester (DIBP) (0.028 mol). The resulting mixture was reacted at 110° C. for 1 hour with stirring, and then left without stirring to precipitate a solid product. The supernatant was removed therefrom and 250 ml of fresh toluene was added to wash the precipitate and stirred for 15 minutes. Repeat the same washing steps again.

[0033] Add 200ml of toluene again to the solid product obtained, and then add 75ml of titanium tetrachloride and 5.0ml of DIBP continuously therein...

Embodiment 2～5

[0048] Propylene polymers were produced by using the same catalyst system and the same method as in Example 1 above, except that the amount of hydrogen used in the [propylene polymerization] step was changed to 200ml, 500ml, 2000ml and 3000ml, respectively.

[0049] For each of the obtained propylene polymers, the polymerization activity, isotactic index, melt flow rate and melting point were measured by the same method as in Example 1 above, and the results are shown in Table 1 below.

Embodiment 6～8

[0051] By using the same catalyst system and the same method as in Example 1 above to prepare a propylene polymer, except changing the amount of hydrogen to 500ml in the [propylene polymerization] step, isobutylethoxysilane (IBTES) as an external electron donor The amount of was changed to 0.3mmol, 0.5mmol and 1.4mmol respectively.

[0052] For each of the obtained propylene polymers, the polymerization activity, isotactic index, melt flow rate and melting point were measured by the same method as in Example 1 above, and the results are shown in Table 1 below.

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Abstract

The present invention relates to a method for producing a propylene polymer having a very high melt flowability, specifically to a method for producing an isotactic propylene polymer having a dramatically improved melt flowability with a relatively high production yield in convenient way, by improving the reactivity of hydrogen that is served as a molecular weight controlling agent in propylene polymerization.

Description

technical field [0001] The present invention relates to a method for producing propylene polymers with extremely high melt fluidity, in particular to a method for producing propylene polymers with relatively convenient methods and higher yields by improving the reactivity of hydrogen used as a molecular weight regulator in propylene polymerization. A method for significantly improving the melt flow of isotactic propylene polymers. Background technique [0002] In the polymerization of propylene, especially when gas phase polymerization, slurry polymerization and bulk polymerization methods are used, the catalyst system used usually consists of a Ziegler type catalyst component, an aluminum alkyl and an external electron donor. In the typical catalyst system for the polymerization of propylene, it is well known that the role of the external electron donor is to improve the isotacticity of the resulting polymer product by selectively suppressing or transforming the non-stereor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F4/64C08F10/00
CPCC08F10/00C08F4/6465C08F4/651C08F4/64C08F10/06
Inventor 朴准励李泳周安镇圭张豪植
Owner SAMSUNG TOTAL PETROCHEMICALS CO LTD
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