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

High-temperature ZIEGLER NATTA solution catalyst

A catalyst and halide technology, applied in the field of new catalyst systems, can solve the problem of not effectively publicizing the use of silicon-containing compounds and the like

Inactive Publication Date: 2003-09-03
NOVA CHEM (INT) SA
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Possibility of using silicon-containing compounds is not effectively considered publicly

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

[0053] Use Ph 3 SiOH as a silicon-containing compound (A and R 8 is a phenyl group, w is 1, x is 0 and D is a hydrogen atom) for a series of polymerizations. The first aluminum component is triethylaluminum (R 1 is ethyl and a is 0) and the second aluminum compound present is diethylaluminum ethoxide (R 4 is ethyl, R 7 is ethyl and b is 1). In the experiment, the Al 2 :Ti molar ratio is 2. In a control experiment, no silicon compound was used. The experimental results are shown in Table 1.

[0054] Table 1

[0055] experiment

[0056] Trial 1 was a control trial without silanol. Runs 2, 3 and 4 showed higher conversion than the control run. In runs 5 and 6, lower amounts of titanium were used in the catalyst and similar conversions were obtained. The polydispersity (Mw / Mn) of the polymers produced using the catalyst of the invention is narrower than that of the control. Example 2

Embodiment 2

[0057] Example 1 was repeated except that the silicon compound was tert-butylMe 2 SiOH (that is, A is tert-butyl, R 8 is a methyl group, w is 1, x is 0 and D is a hydrogen atom). The first aluminum component is diethylaluminum ethoxide (R 4 is ethyl, R 7 is ethyl and b is 1) and there is a second aluminum compound which is with tert-butyl Me 2 SiOH(R 1 is ethyl and a is 0) combined triethylaluminum. In a control experiment, no silicon compound was used. The experimental results are shown in Table 2.

[0058] experiment

[0059] The results show that the second component can be an aluminum alkyl combined with a silanol and the first component can be an aluminum alkyl alkoxide and still have a higher conversion than the control. Furthermore, the polymers prepared according to the invention had a narrower polydispersity than the control. Example 3

Embodiment 3

[0060] Repeat Example 2, except that the first aluminum compound is with tert-butyl Me 2 SiOH is combined with triethylaluminum and a second aluminum compound is diethylaluminum ethoxide. The experimental results are shown in Table 3.

[0061] experiment

[0062] Table 3 Runs 11 and 12 illustrate that when using the silicon-containing catalysts of the present invention, it is possible to reduce the titanium in the catalyst by up to about 40% and still maintain similar ethylene conversions. Furthermore, the polymers prepared according to the invention have narrower polydispersities than those prepared according to the prior art. Example 4

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

The present invention provides a Ziegler-Natta catalyst useful in solution processes for the polymerization of olefins having a low amount of aluminum and magnesium. The catalysts of the present invention contain an alkyl silanol and have a molar ratio of Si:Ti from 0.25:1 to 4:1. The catalysts are effective for the solution polymerization of olefins at high temperatures.

Description

technical field [0001] The present invention relates to novel catalyst systems for the polymerization of olefins. The catalyst system comprises a mixture of: (i) dialkyl magnesium compounds; (ii) aluminum alkyl compounds; (iii) silanols; (iv) alkyl halides; (v) transition metal halides; Optionally (vi) dialkylaluminum alkoxides or trialkylaluminum compounds. The catalyst system is especially useful as a catalyst system for the solution polymerization of olefins, especially for the polymerization of copolymers and homopolymers of ethylene. Background technique [0002] US Patent 6,130,300 (issued to Jaber on October 10, 2000) discloses a low aluminum and magnesium Ziegler-Natta system. The catalyst comprises a mixture of aluminum and dialkylmagnesium compounds, alkyl halides, titanium halides and dialkylaluminum alkoxides. The patent does not suggest that silanols can be used in the catalyst. Additionally, the present invention contemplates certain situations in which the...

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): C08F4/646B01J31/12C08F2/06C08F4/64C08F4/649C08F4/656C08F10/00C08F210/02C08F210/16
CPCC08F10/00C08F210/16C08F4/6567C08F4/6576C08F210/08C08F2500/03C08F2500/12C08F210/14B01J31/12
Inventor I·亚伯
Owner NOVA CHEM (INT) SA