Ethylene/alpha-olefin copolymer having excellent processability

Patent metadata

Field	Value
Publication number	US-10323110-B2
Application number	US-201615501415-A
Country	US
Kind code	B2
Filing date	Apr 15, 2016
Priority date	Apr 15, 2015
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

The present invention relates to an ethylene/alpha-olefin copolymer having excellent processability. The ethylene/alpha-olefin copolymer according to the present invention has excellent processability and is therefore suitable for producing products by an injection molding method.

First claim

The invention claimed is:

1. An ethylene/1-butene copolymer having:
a weight average molecular weight of 50,000 to 150,000 g/mol,
a molecular weight distribution (M w /M n ) of 5 to 10,
a density of 0.940 to 0.965 g/cm 3 ,
a melt flow rate ratio (MFR 5 /MFR 2-16 , measured at 190° C. according to ASTM 1238) of 3.5 or more,
a C 2 value of −0.25 or less when a graph of a complex viscosity (η*[Pa·s]) versus a frequency (ω [rad/s]) is fitted to a Power Law of Equation 1 below,
y=c 1 x c 2 ,  [Equation 1]

wherein x is the frequency, y is the complex viscosity, C 1 is a consistency index, and C 2 is a CV index.

2. The ethylene/1-butene copolymer according to claim 1 , wherein the weight average molecular weight is 80,000 to 90,000 g/mol.

3. The ethylene/1-butene copolymer according to claim 1 , wherein the molecular weight distribution is 5 to 6.

4. The ethylene/1-butene copolymer according to claim 1 , wherein the density is 0.960 to 0.965 g/cm 3 .

5. The ethylene/1-butene copolymer according to claim 1 , wherein the melt flow rate ratio is 3.5 to 40.

6. The ethylene/1-butene copolymer according to claim 1 , wherein the C 2 value is −0.40 to −0.25.

7. The ethylene/1-butene copolymer according to claim 1 , wherein
the ethylene/1-butene copolymer is produced by polymerizing ethylene and 1-butene in the presence of one or more of the first metallocene compounds represented by the following Chemical Formula 1; and one or more of the second metallocene compounds selected from the compounds represented by the following Chemical Formulas 3 to 5:

in Chemical Formula 1,
A is hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 6-20 aryl, C 7-20 alkylaryl, C 7-20 arylalkyl, C 1-20 alkoxy, C 2-20 alkoxyalkyl, C 3-20 heterocycloalkyl, or C 5-20 heteroaryl;
D is —O—, —S—, —N(R)— or —Si(R)(R′)—, wherein R and R′ are same as or different from each other, and are each independently hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, or C 6-20 aryl;
L is a linear or branched C 1-10 alkylene;
B is carbon, silicon or germanium;
Q is hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 6-20 aryl, C 7-20 alkylaryl, or C 7-20 arylalkyl;
M is a Group 4 transition metal;
X 1 and X 2 are same as or different from each other and are each independently halogen, C 1-20 alkyl, C 2-20 alkenyl, C 6-20 aryl, nitro, amido, C 1-20 alkylsilyl, C 1-20 alkoxy, or C 1-20 sulfonate;
C 1 and C 2 are same as or different from each other and are each independently represented by one of the following Chemical Formulas 2a, 2b or 2c, provided that cases where both C 1 and C 2 are Chemical Formula 2c, are excluded;

in Chemical Formulas 2a, 2b and 2c,
R 1 to R 17 and R 1 ′ to R 9 ′ are same as or different from each other, and are each independently hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 1-20 alkylsilyl, C 1-20 silylalkyl, C 1-20 alkoxysilyl, C 1-20 alkoxy, C 6-20 aryl, C 7-20 alkylaryl, or C 7-20 arylalkyl, and adjacent two or more of the R 10 to R 17 are connected to each other to form a substituted or unsubstituted aliphatic or aromatic ring;
(Cp 1 R a ) n (Cp 2 R b )M 1 Z 1 3-n   [Chemical Formula 3]

in Chemical Formula 3,
M 1 is a Group 4 transition metal;
Cp 1 and Cp 2 are same as or different from each other and are each independently any one selected from the group consisting of cyclopentadienyl, indenyl, 4,5,6,7-tetrahydro-1-indenyl, and fluorenyl radicals, which may be substituted with a hydrocarbon having 1 to 20 carbon atoms;
R a and R b are same as or different from each other and are each independently hydrogen, C 1-20 alkyl, C 1-10 alkoxy, C 2-20 alkoxyalkyl, C 6-20 aryl, C 6-10 aryloxy, C 2-20 alkenyl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 8-40 arylalkenyl, or C 2-10 alkynyl;
Z 1 is a halogen atom, C 1-20 alkyl, C 2-10 alkenyl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 6-20 aryl, substituted or unsubstituted C 1-20 alkylidene, substituted or unsubstituted amino, C 2-20 alkylalkoxy, or C 7- 40 arylalkoxy;
n is 1 or 0;
(Cp 3 R c ) m B 1 (Cp 4 R d )M 2 Z 2 3-m   [Chemical Formula 4]

in Chemical Formula 4,
M 2 is a Group 4 transition metal;
Cp 3 and Cp 4 are same as or different from each other and are each independently any one selected from the group consisting of cyclopentadienyl, indenyl, 4,5,6,7-tetrahydro-1-indenyl and fluorenyl radicals, which may be substituted with a hydrocarbon having 1 to 20 carbon atoms;
R c and R d are same as or different from each other and are each independently hydrogen, C 1-20 alkyl, C 1-10 alkoxy, C 2-20 alkoxyalkyl, C 6-20 aryl, C 6-10 aryloxy, C 2-20 alkenyl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 8-40 arylalkenyl, or C 2-10 alkynyl;
Z 2 is a halogen atom, C 1-20 alkyl, C 2-10 alkenyl, C 7-40 alkyl aryl, C 7-40 arylalkyl, C 6-20 aryl, substituted or unsubstituted C 1-20 alkylidene, substituted or unsubstituted amino, C 2-20 alkylalkoxy, or C 7-40 arylalkoxy;
B 1 is at least one of carbon, germanium, silicon, phosphorus, or nitrogen atom containing radicals, which cross-link Cp 3 R c ring and Cp 4 R d ring or which cross-link one Cp 4 R d ring to M 2 , a combination thereof;
M is 1 or 0;
(Cp 5 R e )B 2 (J)M 3 Z 3 2   [Chemical Formula 5]

in Chemical Formula 5,
M 3 is a Group 4 transition metal;
Cp 5 is any one selected from the group consisting of cyclopentadienyl, indenyl, 4,5,6,7-tetrahydro-1-indenyl and fluorenyl radicals, which may be substituted with a hydrocarbon having 1 to 20 carbon atoms;
R c is hydrogen, C 1-20 alkyl, C 1-10 alkoxy, C 2-20 alkoxyalkyl, C 6-20 aryl, C 6-10 aryloxy, C 2-20 alkenyl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 8-40 arylalkenyl, or C 2-10 alkynyl;
Z 3 is a halogen atom, C 1-20 alkyl, C 2-10 alkenyl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 6-20 aryl, substituted or unsubstituted C 1-20 alkylidene, substituted or unsubstituted amino, C 2-20 alkylalkoxy, or C 7-40 arylalkoxy;
B 2 is at least one of carbon, germanium, silicon, phosphorus, or nitrogen atom containing radicals, which cross-link Cp 5 R e ring and J, or a combination thereof;
J is any one selected from the group consisting of NR f , O, PR f and S, and the R f is C 1-20 alkyl, aryl, substituted alkyl or substituted aryl.

Assignees

• Lg Chemical Ltd

Inventors

• Sun Soon Ho
• Choi Yi Young
• Lee Ki Soo
• Song Eun Kyoung
• Sung Yu Taek
• Lee Ye Jin
• Han Chang Woan
• Cho Sol

Classifications

• C08F4/65925

  two cyclopentadienyl rings being mutually non-bridged · CPC title

• C08F4/65908

  in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+ · CPC title

• C08F210/16 Primary

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title

• C08F4/65927

  two cyclopentadienyl rings being mutually bridged · CPC title

• C08F4/6592

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