Olefin-based polymer, film prepared therefrom, and preparation methods therefor

Patent metadata

Field	Value
Publication number	US-2023416427-A1
Application number	US-202118038340-A
Country	US
Kind code	A1
Filing date	Nov 12, 2021
Priority date	Nov 23, 2020
Publication date	Dec 28, 2023
Grant date	—

Abstract

The present invention relates to an olefin-based polymer, a film prepared therefrom, and preparation methods therefor. An olefin-based polymer according to an embodiment of the present invention has excellent processability, and a film prepared therefrom, particularly, a linear low density polyethylene film has excellent mechanical strength, in particular, drop impact strength.

First claim

1 . An olefin-based polymer which has (1) a density of 0.915 to 0.935 g/cm 3 ; (2) a melt index (I 2.16 ) of 0.3 to 3.0 g/10 min as measured with a load of 2.16 kg at 190° C.; (3) a ratio between a melt index (I 21.6 ) measured with a load of 21.6 kg and a melt index (I 2.16 ) measured with a load of 2.16 kg at 190° C. (melt flow ratio; MFR) of 20 to 50; and (4) a comonomer distribution slope (CDS) defined by the following Equation 1 of 3 or more, wherein a film prepared therefrom has a drop impact strength of 1,200 to 1,550 g based on a thickness of 50 μm:

CDS
=

log
⁢

C
80

-

log
⁢

C
20

log
⁢

M
80

-

log
⁢

M
20

[

Equation
⁢

1

]

wherein C 20 and C 80 are comonomer contents at points where cumulative weight fractions are 20% and 80%, respectively, in a comonomer distribution, and M 20 and M 80 are molecular weights at points where cumulative weight fractions are 20% and 80%, respectively, in a comonomer distribution.

2 . The olefin-based polymer of claim 1 , wherein the olefin-based polymer has (1) the density of 0.915 to 0.930 g/cm 3 ; (2) the melt index of 0.5 to 2.0 g/10 min as measured with a load of 2.16 kg at 190° C.; (3) the MFR of 20 to 45; and (4) the CDS of 3 to 15.

3 . The olefin-based polymer of claim 1 , wherein the olefin-based polymer is prepared by polymerizing an olefin-based monomer in the presence of a hybrid catalyst including: at least one first transition compound represented by the following Chemical Formula 1; and at least one second transition metal compound selected from a compound represented by the following Chemical Formula 2 and a compound represented by the following Chemical Formula 3:

wherein M 1 and M 2 are different from each other and independently of each other titanium (Ti), zirconium (Zr), or hafnium (Hf),
X is independently of each other halogen, C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkynyl, C 6-20 aryl, C 1-20 alkyl C 6-20 aryl, C 6-20 aryl C 1-20 alkyl, C 1-20 alkylamido, or C 6-20 arylamido, and
R 1 to R 10 are independently of one another hydrogen, substituted or unsubstituted C 1-20 alkyl, substituted or unsubstituted C 2-20 alkenyl, substituted or unsubstituted C 6-20 aryl, substituted or unsubstituted C 1-20 alkyl C 6-20 aryl, substituted or unsubstituted C 6-20 aryl C 1-20 alkyl, substituted or unsubstituted C 1-20 heteroalkyl, substituted or unsubstituted C 3-20 heteroaryl, substituted or unsubstituted C 1-20 alkylamido, substituted or unsubstituted C 6-20 arylamido, substituted or unsubstituted C 1-20 alkylidene, or substituted or unsubstituted C 1-20 silyl, but R 1 to R 10 may be independently of each other connected to an adjacent group to form a substituted or unsubstituted saturated or unsaturated C 4-20 ring.

4 . The olefin-based polymer of claim 3 , wherein M 1 and M 2 are different from each other and are zirconium or hafnium, X is halogen or C 1-20 alkyl, respectively, and R 1 to R 10 are hydrogen, substituted or unsubstituted C 1-20 alkyl, substituted or unsubstituted C 1-20 alkenyl, or substituted or unsubstituted C 6-20 aryl, respectively.

5 . The olefin-based polymer of claim 4 , wherein M 1 is hafnium, M 2 is zirconium, and X is chlorine or methyl.

6 . The olefin-based polymer of claim 3 , wherein the first transition metal compound is at least one of transition metal compounds represented by the following Chemical Formulae 1-1 and 1-2, and the second transition metal compound is at least one of transition metal compounds represented by the following Chemical Formulae 2-1, 2-2, and 3-1:

wherein Me is a methyl group.

7 . The olefin-based polymer of claim 3 , wherein a mole ratio of the first transition metal compound to the second transition metal compound is in a range of 100:1 to 1:100.

8 . The olefin-based polymer of claim 3 , wherein the catalyst includes at least one cocatalyst compound selected from the group consisting of a compound represented by the following Chemical Formula 4, a compound represented by the following Chemical Formula 5, and a compound represented by the following Chemical Formula 6:

wherein n is an integer of 2 or more, R a is a halogen atom, a C 1-20 hydrocarbon group, or a C 1-20 hydrocarbon group substituted with halogen,
D is aluminum (Al) or boron (B), R b , R c , and R d are independently of one another a halogen atom, a C 1-20 hydrocarbon group, a C 1-20 hydrocarbon group substituted with halogen, or a C 1-20 alkoxy group,
L is a neutral or cationic Lewis base, [L−H] + and [L] + are a Bronsted acid, Z is a group 13 element, and A is independently of each other a substituted or unsubstituted C 6-20 aryl group or a substituted or unsubstituted C 1-20 alkyl group.

9 . The olefin-based polymer of claim 8 , wherein the catalyst further includes a carrier which supports the transition metal compound, the cocatalyst compound, or both of them.

10 . The olefin-based polymer of claim 9 , wherein the carrier includes at least one selected from the group consisting of silica, alumina, and magnesia.

11 . The olefin-based polymer of claim 9 , wherein a total amount of the hybrid transition metal compound supported on the carrier is 0.001 to 1 mmol based on 1 g of the carrier, and a total amount of the cocatalyst compound supported on the carrier is 2 to 15 mmol based on 1 g of the carrier.

12 . The olefin-based polymer of claim 3 , wherein the olefin-based polymer is a copolymer of the olefin-based monomer and an olefin-based comonomer.

13 . The olefin-based polymer of claim 12 , wherein the olefin-based monomer is ethylene, and the olefin-based comonomer is one or more selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-

Assignees

• Hanwha Solutions Corp

Inventors

• Lee Munhee
• Kim Sung Dong
• Joung Ui Gap
• Park Jeong Hyun
• Park Hye Ran
• Seo Junho
• Lim Seongjae
• Jo Jisong

Classifications

• C08F210/16 Primary

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

• C08F2410/04

  Dual catalyst, i.e. use of two different catalysts, where none of the catalysts is a metallocene · CPC title

• C08F4/025

  Metal oxides · CPC title

• C08F4/76

  selected from titanium, zirconium, hafnium, vanadium, niobium or tantalum · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title