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Metallocene catalyst and its prepn

A metallocene catalyst and catalyst technology, applied in the field of metallocene catalysts for polyolefins and their preparation, can solve the problems of resin processing performance that cannot meet special requirements, difficult bimodal or multimodal distribution, etc., to shorten the process flow and post-treatment Process effect

Inactive Publication Date: 2004-09-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the synthesis process described in this method is relatively simple, because the transition metal for preparing the catalyst is only taken from any one of zirconium, titanium, and hafnium, the molecular weight of the produced polyolefin resin presents a broad-peak distribution, and it is difficult to achieve bimodality. Or the purpose of multimodal distribution, the processing performance of the resin can not meet the special requirements, especially in the salivation molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-a

[0013] A mixture of 13.98 grams of zirconium tetrachloride and 7.6 grams of titanium tetrachloride was used to replace 23.3 grams of zirconium tetrachloride in Comparative Example 1, and the metallocene catalyst was prepared according to the method of Comparative Example 1. The polymerization results are shown in Table 1.

Embodiment 1-b

[0015] Replace 23.3 gram of zirconium tetrachloride in comparative example 1 with the mixture of 16.31 gram of zirconium tetrachloride, 3.8 gram of titanium tetrachloride and 3.2 gram of hafnium tetrachloride, make metallocene catalyst by the method of comparative example 1, for The results of ethylene polymerization are shown in Table 1.

Embodiment 2

[0023] The metallocene catalyst was prepared according to the method of Comparative Example 2 with 21 grams of zirconium tetrachloride and 3.2 grams of hafnium tetrachloride mixture instead of 23.3 grams of zirconium tetrachloride in Comparative Example 2-a. The polymerization results are shown in Table 1.

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PUM

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Abstract

At least two kinds of IVB metal are made to react with the material containing cyclopentadienyl diene skeleton to prepare the multicomponent metallocene catalyst in one single-step process. The metallocene catalyst is used in polymerization of olefine to obtain double peaked or multiple peaked polymer.

Description

technical field [0001] The invention relates to a polyolefin catalyst and a preparation method thereof, in particular to a polyolefin metallocene catalyst and a preparation method thereof. Background technique [0002] The use of metallocene catalysts in olefin polymerization has been well known in the art. Metallocene catalysts with single active sites are used for olefin polymerization. The molecular weight distribution of the obtained resin is too narrow and the processability is poor. Development of metallocene polyolefins with broad peaks and multimodal distribution Resin has become a new research hotspot. US5539076, US5529965, and US6001766 proposed the technology of compounding traditional Ziegler-Natta catalysts with various metallocene catalysts to obtain wide molecular weight distribution resins. CN1032343A discloses a structural formula of at least two different chirality and rigidity as R" (C 5 (R') 4 ) 2 MQ P A system composed of a metallocene catalyst, whe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F4/76
Inventor 韦少义朱博超陈雪蓉王德平魏红冯玉涛徐晓敏郝萍朱雅杰杨涛姚培洪
Owner PETROCHINA CO LTD