Metallocene-supported catalyst and method for preparing polypropylene using the same

Patent metadata

Field	Value
Publication number	US-11358979-B2
Application number	US-201816957962-A
Country	US
Kind code	B2
Filing date	Dec 21, 2018
Priority date	Dec 26, 2017
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

The present invention relates to a supported catalyst comprising a novel metallocene compound having excellent polymerization activity, and a method for producing polypropylene comprising polymerizing propylene in the presence of the catalyst. The supported metallocene-catalyst of the present invention can produce a polypropylene having a relatively narrow molecular weight distribution and a SPAN value.

First claim

What is claimed is:

1. A supported metallocene catalyst comprising:
a metallocene compound represented by the following Chemical Formula 1, and
a support

wherein, in Chemical Formula 1,
n is an integer from 4 to 10,
R 1 and R 2 are the same as or different from each other, and each independently, an aryl having 6 to 20 carbon atoms or an aryl having 6 to 20 carbon atoms substituted with an alkyl having 1 to 20 carbon atoms;
R 3 is an alkyl group having 1 to 20 carbon atoms;
R 4 is a tertiary amino having an alkyl group having 1 to 10 carbon atoms;
A is carbon, silicon or germanium; and
each X is the same as or different from each other, and each independently, a halogen or an alkyl group having 1 to 20 carbon atoms.

2. The supported metallocene catalyst of claim 1 ,
wherein the R 4 in Chemical Formula 1 is dimethylamino, dipropylamino, diisopropylamino, diphenylamino, methylpropylamino, methylphenylamino, or isopropylphenylamino.

3. The supported metallocene catalyst of claim 1 , wherein the compound represented by Chemical Formula 1 is one of the compounds represented by the following structural formulas:

4. The supported metallocene catalyst of claim 1 , further comprising one or more cocatalyst compounds selected among the compounds represented by the following Chemical Formula 2, Chemical Formula 3, or Chemical Formula 4:
—[Al(R 5 )—O] m —  [Chemical Formula 2]

wherein, in Chemical Formula 2,
each R 5 is the same as or different from each other, and each independently, halogen; a hydrocarbon having 1 to 20 carbon atoms; or a hydrocarbon having 1 to 20 carbon atoms substituted with halogen; and
m is an integer of 2 or more;
J(R 6 ) 3   [Chemical Formula 3]

wherein, in Chemical Formula 3,
each R 6 is the same as or different from each other, and each independently, halogen; a hydrocarbon having 1 to 20 carbon atoms; or a hydrocarbon having 1 to 20 carbon atoms substituted with halogen; and
J is aluminum or boron;
[E−H] + [ZA′ 4 ] − or [E] + [ZA′ 4 ] −   [Chemical Formula 4]

wherein in Chemical Formula 4,
E is a neutral or cationic Lewis acid;
H is a hydrogen atom;
Z is a Group 13 element; and
each A′ is the same as or different from each other, and each independently an aryl group having 6 to 20 carbon atoms or an alkyl group having 1 to 20 carbon atoms, of which at least one hydrogen atom is unsubstituted or substituted with a halogen, a hydrocarbon having 1 to 20 carbon atoms, an alkoxy or a phenoxy.

5. The supported metallocene catalyst of claim 1 ,
wherein the support is one or more selected from the group consisting of silica, alumina, magnesia, and mixtures thereof.

6. The supported metallocene catalyst of claim 1 ,
wherein a weight ratio of the transition metal of the metallocene compound to the support is 1:10 to 1:1,000.

7. A method for preparing a polypropylene comprising polymerizing propylene in the presence of the supported metallocene catalyst of claim 1 .

8. The method for preparing a polypropylene of claim 7 , wherein the polymerization of propylene is carried out by reacting at a temperature of 25° C. to 500° C. and a pressure of 1 kgf/cm 2 to 100 kgf/cm 2 for 1 hour to 24 hours.

9. The method for preparing a polypropylene of claim 7 , wherein the reaction is carried out in the presence of 30 ppm to 2,000 ppm of hydrogen (H 2 ) gas based on the weight of the propylene.

Assignees

• Lg Chemical Ltd

Inventors

• Cheong Jae Youp
• Kwon Heon Yong
• Hong Daesik
• Jeon Sangjin

Classifications

• C08F4/52

  selected from boron, aluminium, gallium, indium, thallium or rare earths (C08F4/14 takes precedence) · CPC title

• C08F4/65916

  supported on a carrier, e.g. silica, MgCl2, polymer · CPC title

• C08F110/06 Primary

  Propene · CPC title

• C08F4/65927 Primary

  two cyclopentadienyl rings being mutually bridged · CPC title

• C08F2/38

  Polymerisation using regulators, e.g. chain terminating agents {, e.g. telomerisation} · CPC title