Polyolefin

Patent metadata

Field	Value
Publication number	US-12460029-B2
Application number	US-202118011518-A
Country	US
Kind code	B2
Filing date	Oct 28, 2021
Priority date	Nov 17, 2020
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

This invention relates to polyolefin. More specifically, this invention relates to polyolefin that may exhibit improved mechanical properties such as excellent drop impact strength.

First claim

What is claimed is:

1 . Polyolefin satisfying requirements of 1) to 3):
1) density measured according to ASTM D1505 being 0.915 g/cm 3 to 0.930 g/cm 3 ; 2) melt index (MI) measured at 190° C., under load of 2.16 kg according to ASTM D1238 being 0.5 to 1.5 g/10 min; and 3) by Successive Self-nucleation and Annealing (SSA) analysis, a rate of chains having ASL (Average Ethylene Sequence Length) of 22 nm or more being 16 wt % or more based on a total chains, and a rate of chains having Average Ethylene Sequence Length (ASL) of 8 nm or less being 38 wt % or more based on the total chains.

2 . The polyolefin according to claim 1 , wherein the SSA is conducted using differential scanning calorimeter, by heating the polyolefin to the first heating temperature of 120 to 124° C., maintaining for 15 to 30 minutes, and then, cooling to 28 to 32° C., and while decreasing heating temperature by stages with (n+1) th heating temperature being 3 to 7° C. lower than nth heating temperature, repeating heating-annealing-quenching until the final heating temperature becomes 50 to 54° C., and finally, raising the temperature from 30° C. to 160° C.

3 . The polyolefin according to claim 1 , wherein Short Chain Branch (SCB) content is 22/1000 C or more.

4 . The polyolefin according to claim 1 , wherein polydispersity index (PDI) defined as Mw/Mn is 3.3 to 4.0, wherein Mw is a weight average molecular weight, and Mn is a number average molecular weight.

5 . The polyolefin according to claim 1 , wherein dart drop impact strength measured according to ASTM D 1709, Method A, after preparing a polyolefin film having BUR 2.3, and a film thickness of 55 to 65 μm using a film applicator, is 1,500 g or more.

6 . The polyolefin according to claim 1 , wherein the polyolefin comprises a copolymer of ethylene and an alpha olefin.

7 . The polyolefin according to claim 6 , wherein the alpha olefin comprises 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-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-eicosene, norbornene, norbornadiene, ethylidene norbordene, phenyl norbordene, vinyl norbordene, dicyclopentadiene, 1,4-butadiene, 1,5-pentadiene, 1,6-hexadiene, styrene, alpha-methyl styrene, divinylbenzene, and 3-chloromethyl styrene.

8 . The polyolefin according to claim 1 , wherein the polyolefin is prepared by polymerizing olefin monomers, in the presence of a hybrid supported metallocene catalyst comprising one or more first metallocene compounds selected from compounds represented by Chemical Formula 1; one or more second metallocene compounds selected from compounds represented by Chemical Formula 2; and a carrier supporting the first and second metallocene compounds:

wherein in the Chemical Formula 1,
M is a Group 4 transition metal,
X 1 and X 2 are identical to or different from each other, and are each independently, hydrogen, halogen, C 1-20 alkyl, or QCOO—, and Q is C 1-20 alkyl,
A is carbon, silicon or germanium,
R 1 and R 2 are identical to or different from each other, and are each independently, C 1-20 alkyl, C 2-20 alkenyl, C 6-30 aryl,
R 3 to R 6 are identical to or different from each other, and are each independently, hydrogen, C 1-20 alkyl, C 2-20 alkenyl, C 6-30 aryl, C 7-30 alkylaryl, or C 7-30 arylalkyl,
R 7 and R 7 ′ are identical to or different from each other, and are each independently, C 1-20 alkyl, C 2-20 alkenyl, C 6-30 aryl, or C 2-20 alkoxy alkyl, and
E is one selected from the group consisting of sulfur(S), oxygen (O) and selenium (Se),

wherein in Chemical Formula 2,
M′ is a Group 4 transition metal,
A′ is carbon, silicon or germanium,
X 3 and X 4 are identical to or different from each other, and are each independently, halogen, or C 1-20 alkyl,
R 8 to R 11 are identical to or different from each other, and are each independently, hydrogen, C 1-20 alkyl, C 2-20 alkenyl, C 6-20 aryl, C 7-20 alkylaryl, C 7-20 arylalkyl, or two or more neighboring substituents of R 8 to R 11 are linked to each other to form a substituted or unsubstituted aliphatic ring, aromatic ring, or hetero aromatic ring comprising one or more selected from the group consisting of N, O and S,
R 12 and R 12 ′ are identical to or different from each other, and are each independently, C 1-20 alkyl, C 2-20 alkenyl, C 6-30 aryl, or C 2-20 alkoxy alkyl, and
R 13 is C 1-20 alkyl, C 2-20 alkenyl, or C 6-30 aryl.

9 . The polyolefin according to claim 8 , wherein the compound represented by Chemical Formula 1 is one selected from compounds represented by the following structural formulas:

wherein in the structural formulas,
Me denotes methyl,
Et denotes ethyl,
nPr denotes n-propyl,
Hx denotes n-hexyl,
Ph denotes phenyl, and
t-Bu denotes tert-butyl.

10 . The polyolefin according to claim 8 , wherein the compound represented by Chemical Formula 2 is one selected from compounds represented by the following structural formulas:

11 . The polyolefin according to claim 8 , wherein a mole ratio of the first and second metallocene compounds is 1:1 to 1:10.

12 . The polyolefin according to claim 8 , wherein the carrier comprises silica, alumina, magnesia, or a mixture thereof.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Jinyoung
• Gwon Donghyeon
• Jung Yoonchul
• Lee Chaeeun
• Kim Byung Seok
• Lee Jeongkyu
• Hong Seok Bin
• Kim Seyoung

Classifications

• C08F10/02

  Ethene · CPC title

• C08F4/65916

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

• C08F4/65912

  in combination with an organoaluminium compound · 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

• C08F2420/06

  Cp analog where at least one of the carbon atoms of the non-coordinating part of the condensed ring is replaced by a heteroatom · CPC title