Preparation method of a propylene-1-butene copolymer and a propylene-1-butene copolymer obtained therefrom

Patent metadata

Field	Value
Publication number	US-9587053-B2
Application number	US-201415023585-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Sep 30, 2013
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

The disclosed is a preparation method of a propylene-1-butene copolymer by using a catalyst that includes a novel metallocene compound having excellent copolymerization activity.

First claim

What is claimed is:

1. A method of preparing a propylene-1-butene copolymer, including the step of polymerizing propylene and 1-butene in the presence of a catalyst including a metallocene compound represented by the following Chemical Formula 1:

in Chemical Formula 1,
M 1 is a group 3 transition metal, a group 4 transition metal, a group 5 transition metal, a lanthanide transition metal, or an actinide transition metal;
X is, same to or different from each other, a halogen;
A is a group 14 element which is a bridge group connecting indenyl groups;
R l is a C 1 -C 20 alkyl, alkenyl, alkylaryl, arylalkyl, or aryl;
R 2 is hydrogen, or a C 1 -C 20 alkyl, alkenyl, alkylaryl, arylalkyl, or aryl;
R 3 , R 3′ , R 4 , and R 4′ are, same to or different from each other, respectively a C 1 -C 20 alkyl, alkenyl, alkylaryl, arylalkyl, or aryl; and
n is an integer of 1 to 20.

2. The method of preparing a propylene-1-butene copolymer according to claim 1 , wherein R 1 and R 2 are respectively a C 1 -C 4 alkyl; R 3 and R 3′ are respectively a C 1 -C 20 alkyl, alkenyl, or arylalkyl; R 4 and R 4′ are respectively a C 1 -C 20 aryl or alkylaryl; n is an integer of 1 to 6; and A is silicon (Si) in Chemical Formula 1.

3. The method of preparing a propylene-1-butene copolymer according to claim 1 , wherein the catalyst is a supported catalyst including the metallocene compound, an alkylaluminoxane cocatalyst, and a boron-based cocatalyst which are supported on a carrier.

4. The method of preparing a propylene-1-butene copolymer according to claim 3 , wherein the alkylaluminoxane cocatalyst is one or more selected from the group consisting of methylaluminoxane, ethylaluminoxane, propylaluminoxane, and butylaluminoxane.

5. The method of preparing a propylene-1-butene copolymer according to claim 3 , wherein the boron-based cocatalyst is one or more selected from the group consisting of dimethylanilinium tetrakis(pentafluorophenyl)borate, trityl tetrakis(pentafluorophenyl)borate, and methylanilinium tetrakis(pentafluorodiphenyl)borate.

6. The method of preparing a propylene-1-butene copolymer according to claim 3 , wherein the carrier is one or more selected from the group consisting of silica, silica-alumina and silica-magnesia.

7. The method of preparing a propylene-1-butene copolymer according to claim 1 , wherein the polymerization of propylene and 1-butene is carried out at the temperature of 25 to 500 ° C. and the pressure of 1 to 100 kgf/cm 2 for 1 to 24 hrs.

8. The method of preparing a propylene-1-butene copolymer according to claim 1 , wherein propylene and 1-butene are polymerized with the weight ratio of 99.5:0.5 to 85:15.

9. The method of preparing a propylene-1-butene copolymer according to claim 1 , wherein the polymerization of propylene and 1-butene is carried out in the presence of hydrogen gas (H 2 ) of 10 to 2,000 ppm, based on the total weight of propylene.

10. A propylene-1-butene copolymer obtained by the method of claim 1 , of which the melt index (MI) is 10 to 40 g/10min, measured at 230 ° C. with the load of 2.16 kg according to ASTM D1238.

Assignees

• Lg Chemical Ltd

Inventors

• Noh Kyung Seop
• Park Churl Young
• Kim Won Hee
• Jeon Sang Jin
• Choi Ra Yun
• Kim Byung Seok
• Choi Ji Ho

Classifications

• C08F210/06 Primary

  Propene · CPC title

• C08F4/6592

  containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring · CPC title

• C08F4/65912

  in combination with an organoaluminium compound · CPC title

• C08F210/04 Primary

  Monomers containing three or four carbon atoms · CPC title

• C08F210/08

  Butenes · CPC title