Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for polymerization and copolymerization of ethylene

A technology of copolymerization and ethylene, applied in the field of ethylene polymerization and copolymerization, which can solve the problems of complex catalyst preparation process, difficulty in producing polymers with wide molecular weight distribution, complex catalyst production process, etc.

Inactive Publication Date: 2005-08-03
HANWHA TOTAL PETROCHEMICAL CO LTD
View PDF8 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this prior art has disadvantages in that the production process of the catalyst is complicated and it is difficult to control the polymerization process conditions due to the difference in reactivity to hydrogen, monomer and comonomer between titanium and vanadium.
[0007] As mentioned above, it is difficult to produce polymers with broad molecular weight distribution by using common Ziegler-Natta type catalysts while maintaining high catalytic activity and high bulk density of the resulting polymers
In addition, the conventional technology has the problems that the preparation process of the catalyst is complicated and it is not easy to control the polymerization process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Catalyst production

[0037] Solid titanium catalysts are produced through the following three steps:

[0038] (i) Preparation of magnesium solution

[0039] Into a 1.0 L reactor equipped with a mechanical stirrer and replaced with a nitrogen atmosphere, 19.0 g of magnesium chloride and 400 ml of decane were placed and stirred at 700 rpm. Then, 120 ml of 2-ethylhexanol was added thereto, and the temperature was raised to 120°C, and then the reaction was continued for 3 hours. The homogeneous solution obtained by the reaction was cooled to room temperature (25°C).

[0040] (ii) Contact-reaction of magnesium solution with hydroxyl-containing ester and alkoxysilane compound

[0041] 1.2 ml of 2-hydroxyethyl methacrylate and 12.0 ml of ethyl silicate were added to the magnesium solution cooled to room temperature, and the reaction was continued for 1 hour.

[0042] (iii) Treatment of mixture of titanium compound and haloalkane compound and reaction of titanium compound ...

Embodiment 2

[0050] Preactivation was carried out according to Example 1, except that in the preactivation process, 3.0 ml of 1M ethylaluminum dichloride was used instead of 3.0 ml of 1M diethylaluminum chloride. Other conditions were the same as those in Example 1, and the results are shown in Table 1.

Embodiment 3

[0052] Preactivation was carried out as in Example 1, except that in the preactivation process, 3.0 ml of 1M ethylaluminum sesquichloride was used instead of 3.0 ml of 1M diethylaluminum chloride. Other conditions were the same as those in Example 1, and the results are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for polymerization and copolymerization of ethylene is disclosed. The polymerization is carried out in the presence of a preactivated titanium solid complex catalyst supported on a carrier containing magnesium. According to the method of the present invention, the resulting polymers have the advantage of high bulk density and broad molecular weight distribution.

Description

technical field [0001] The present invention relates to a method for polymerizing and copolymerizing polyethylene by using a preactivated titanium solid complex catalyst supported on a magnesium-containing carrier. Background of the invention [0002] Polymerization or copolymerization catalysts of ethylene, which contain magnesium, are known to have very high catalytic activity, and to provide polymers with high bulk density, and to be suitable for liquid or solid phase polymerization. Liquid phase polymerization of ethylene is a polymerization process carried out in a medium such as bulk ethylene, isopentane or hexane. For processability, important characteristics of the catalyst in this process are the catalytic activity, the bulk density of the resulting polymer, the total amount of low molecular weight material melted in the medium. The molecular weight distribution of the polymer depends on the characteristics of the catalyst itself and the polymerization process. Pol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/642C08F4/658C08F10/00C08F110/02
CPCC08F110/02C08F4/6565C08F4/651C08F4/642C08F2500/18C08F2500/04C08F2500/12C08F10/02
Inventor 杨春炳李龙馥金湘烈金原莹
Owner HANWHA TOTAL PETROCHEMICAL CO LTD