Ethylene/alpha-olefin copolymers having excellent processability

Patent metadata

Field	Value
Publication number	US-10155830-B2
Application number	US-201515106708-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Dec 8, 2014
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

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 low complex viscosity at high shear rate and has excellent processability, and thus it could be applied to the processing of a large diameter pipe, a complex pipe or the like.

First claim

The invention claimed is:

1. An ethylene/alpha-olefin copolymer in which:
the density (g/cm 3 ) is 0.930 to 0.950;
MFR 5 (g/10 min, measured at 190° C. in accordance with ASTM 1238) is 0.1 to 5;
the melt flow rate ratio (MFR 21.6 /MFR 5 , measured at 190° C. in accordance with ASTM 1238) is 10 to 200; and
when a graph of complex viscosity (η*[Pa·s]) versus frequency (ω[rad/s]) is fitted to the power law of the following Equation 1, a C 1 value is 250,000 to 400,000 and a C 2 value is −0.7 to −0.5, and when fitted to the cross model of the following Equation 2, a C 1 value is 1,500,000 to 2,500,000, a C 2 value is 3 to 10, a C 3 value is 0.2 to 0.3, x is frequency, and y is complex viscosity:

y
=

c
1

⁢

x

c
2

[

Equation
⁢

⁢
1

]

y
=

c
1

1
+

(

c
2

⁢
x

)

(

1
-

c
3

)

.

[

Equation
⁢

⁢
2

]

2. The ethylene/alpha-olefin copolymer according to claim 1 wherein when x in Equation 2 is 800, the value of y is 3,000 to 5,000.

3. The ethylene/alpha-olefin copolymer according to claim 2 wherein the value of y is 4,000 to 4,900.

4. The ethylene/alpha-olefin copolymer according to claim 1 wherein when x in Equation 2 is 1,200, the value of y is 3,000 to 3,800.

5. The ethylene/alpha-olefin copolymer according to claim 4 wherein the value of y is 3,000 to 3,700.

6. The ethylene/alpha-olefin copolymer according to claim 1 wherein the C 2 value in Equation 2 is 5 to 8.

7. The ethylene/alpha-olefin copolymer according to claim 1 wherein the ethylene/alpha olefin copolymer has a weight average molecular weight (g/mol) of 10,000 to 400,000, and a molecular weight distribution (Mw/Mn, PDI) of 5 to 30.

8. The ethylene/alpha-olefin copolymer according to claim 1 wherein the alpha-olefin is one or more selected from the group consisting of 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene and 1-eicosene.

9. The ethylene/alpha-olefin copolymer according to claim 1 wherein the ethylene/alpha-olefin copolymer is prepared by polymerizing ethylene and alpha-olefin in the presence of one or more of the first metallocene compounds represented by the following Chemical Formula 1; and one ore more of the second metallocene compounds selected among the compounds represented by the following Chemical Formulae 3 to 5:

in Chemical Formula 1,
A is hydrogen, halogen, C 1 -C 20 alkyl, C 2 -C 20 alkenyl, C 6 -C 20 aryl, C 7 -C 20 alkylaryl, C 7 -C 20 arylalkyl, C 1 -C 20 alkoxy, C 2 -C 20 alkoxyalkyl, C 3 -C 20 heterocycloalkyl, or C 5 -C 20 heteroaryl;
D is —O—, —S—, —N(R)—, or —Si(R)(R′)—, wherein R and R′ are the same as or different from each other, and each independently hydrogen, halogen, C 1 -C 20 alkyl, C 2 -C 20 alkenyl, or C 6 -C 20 aryl;
L is C 1 -C 10 linear or branched alkylene;
B is carbon, silicon, or germanium;
Q is hydrogen, halogen, C 1 -C 20 alkyl, C 2 -C 20 alkenyl, C 6 -C 20 aryl, C 7 -C 20 alkylaryl, or C 7 -C 20 arylalkyl;
M is a Group 4 transition metal;
X 1 and X 2 are the same as or different from each other, and each independently halogen, C 1 -C 20 alkyl, C 2 -C 20 alkenyl, C 6 -C 20 aryl, nitro, amido, C 1 -C 20 alkylsilyl, C 1 -C 20 alkoxy, or C 1 -C 20 sulfonate;
C 1 and C 2 are the same as or different from each other, and each independently represented by any one of the following Chemical Formula 2a, Chemical Formula 2b or Chemical Formula 2c, provided that both of C 1 and C 2 are not represented by the following Chemical Formula 2c:

in Chemical Formulae 2a, 2b and 2c,
R 1 to R 17 and R 1 ′ to R 9 ′ are the same as or different from each other, and each independently hydrogen, halogen, C 1 -C 20 alkyl, C 2 -C 20 alkenyl, C 1 -C 20 alkylsilyl, C 1 -C 20 silylalkyl, C 1 -C 20 alkoxysilyl, C 1 -C 20 alkoxy, C 6 -C 20 aryl, C 7 -C 20 alkylaryl, or C 7 -C 20 arylalkyl, wherein two or more adjacent groups among R 10 to R 17 may be connected together to form 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 the same as or different from each other, and each independently any one selected from the group consisting of cyclopentadienyl, indenyl, 4,5,6,7-tetrahydro-1-indenyl, and fluorenyl radical, each of which may be substituted by hydrocarbon having 1 to 20 carbon atoms;
R a and R b are the same as or different from each other, and each independently hydrogen, C 1 -C 20 alkyl, C 1 -C 10 alkoxy, C 2 -C 20 alkoxyalkyl, C 6 -C 20 aryl, C 6 -C 10 aryloxy, C 2 -C 20 alkenyl, C 7 -C 40 alkylaryl, C 7 -C 40 arylalkyl, C 8 -C 40 arylalkenyl, or C 2 -C 10 alkynyl;
Z 1 is halogen atom, C 1 -C 20 alkyl, C 2 -C 10 alkenyl, C 7 -C 40 alkylaryl, C 7 -C 40 arylalkyl, C 6 -C 20 aryl, substituted or unsub

Assignees

• Lg Chemical Ltd

Inventors

• Kim Joong Soo
• Sun Soon Ho
• Kwon Oh Joo
• Choi Yi Young
• Lee Ki Soo

Classifications

• C08F2500/12

  Melt flow index or melt flow ratio · 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

• C08L23/0815

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• C08F210/08

  Butenes · CPC title