Metallocene supported catalyst and method for preparing polypropylene using the same

Patent metadata

Field	Value
Publication number	US-10815322-B2
Application number	US-201716088610-A
Country	US
Kind code	B2
Filing date	Oct 11, 2017
Priority date	Nov 22, 2016
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

The present invention relates to a supported metallocene catalyst including a novel single metallocene compound having excellent polymerization activity, and a process for producing a polypropylene having excellent processability and broad molecular weight distribution using the same.

First claim

The invention claimed is:

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

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

2. The supported metallocene catalyst of claim 1 , wherein R 1 and R 2 in Chemical Formula 1 are each independently a i-butoxymethyl group, a methoxymethyl group, an ethoxymethyl group, an i-propoxymethyl group, or a phenoxymethyl group.

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

4. The supported metallocene catalyst of claim 1 , wherein the cocatalyst compound includes one or more compounds represented by the following Chemical Formula 2, Chemical Formula 3, or Chemical Formula 4:
—[Al(R 5 )—O] n —  [Chemical Formula 2]

wherein, in Chemical Formula 2,
each R 5 is the same as or different from each other and each independently represents a halogen, a hydrocarbon having 1 to 20 carbon atoms, or a hydrocarbon having 1 to 20 carbon atoms substituted with a halogen; and
n 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 represents a halogen, a hydrocarbon having 1 to 20 carbon atoms, or a hydrocarbon having 1 to 20 carbon atoms substituted with a 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;
each A′ is the same as or different from each other and each independently represents an aryl group having 6 to 20 carbon atoms or an alkyl group having 1 to 20 carbon atoms, of which one or more hydrogen atoms are substituted with a halogen, a C 1 to C 20 hydrocarbon, an alkoxy, or a phenoxy.

5. The supported metallocene catalyst of claim 1 , wherein the carrier is at least one selected from the group consisting of silica, alumina, and magnesia.

6. The supported metallocene catalyst of claim 1 , wherein a weight ratio of the transition metal of the metallocene compound to the carrier is 1:10 to 1:1000.

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

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

9. The method for preparing polypropylene of claim 7 , which is carried out under hydrogen (H 2 ) gas at 30 to 2000 ppm with respect to the weight of propylene.

Assignees

• Lg Chemical Ltd

Inventors

• Park Jong Woo
• Lee Hye Kyung
• Kim Byung Seok
• Jeon Sang Jin
• Cheong Jae Youp
• Park Hee Kwang

Classifications

• C08F2420/07

  Heteroatom-substituted Cp, i.e. Cp or analog where at least one of the substituent of the Cp or analog ring is or contains a heteroatom · CPC title

• C08F2420/10

  Heteroatom-substituted bridge, i.e. Cp or analog where the bridge linking the two Cps or analogs is substituted by at least one group that contains a heteroatom · CPC title

• C08F10/06

  Propene · CPC title

• C08F4/65922 Primary

  containing at least two cyclopentadienyl rings, fused or not · CPC title

• C08F4/65916

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