Polyolefin

Patent metadata

Field	Value
Publication number	US-12098231-B2
Application number	US-202017778110-A
Country	US
Kind code	B2
Filing date	Nov 20, 2020
Priority date	Dec 12, 2019
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

This invention relates to polyolefin. More specifically, this invention relates to polyolefin that has small copolymer content, but exhibits excellent mechanical properties.

First claim

What is claimed is:

1. A polyolefin having
a density of 0.910 g/cm 3 to 0.930 g/cm 3 ;
SCB (Short Chain Branch) per 1000 carbons of 1.0 to 5.0; and
a block comonomer distribution index (BCDI) calculated by Formula 1 of 1.0 or less:

B
⁢
C
⁢
D
⁢
I

=

A
⁢
S
⁢
L
⁢

fi
⁡
(

<

8
⁢

nm

)

+

A
⁢
S
⁢
L
⁢

fi
⁡
(

>

30
⁢

nm

)

A
⁢
S
⁢
L
⁢

fi
⁡
(

8
∼

30
⁢

nm

)

[

Formula
⁢

1

]

in Formula 1,
ASL fi (<8 nm) is fraction (%) of chains having ASL (Average Ethylene Sequence Length) less than 8 nm, by SSA (Successive Self-nucleation and Annealing) analysis,
ASL fi (>30 nm) is fraction (%) of chains having ASL greater than 30 nm, by the SSA analysis, and
ASL fi (8˜30 nm) is fraction (%) of chains having ASL of 8 to 30 nm, by the SSA analysis,
wherein the SSA analysis is conducted using differential scanning calorimeter, by heating the polyolefin to a 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, and repeating heating-annealing-quenching until a final heating temperature becomes 50 to 54° C.,
wherein the polyolefin is a copolymer comprising a unit derived from ethylene, and
wherein the polyolefin has a melting point (Tm) of 120 to 124° C.

2. The polyolefin according to claim 1 , wherein the polyolefin has weight average molecular weight (Mw) of 100,000 to 500,000 g/mol.

3. The polyolefin according to claim 1 , wherein the ASL fi (8˜30 nm) is 51% to 75%.

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

5. The polyolefin according to claim 1 , wherein the alpha olefin comprises one or more 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, or 3-chloromethyl styrene.

6. The polyolefin according to claim 4 , wherein the polyolefin is prepared by polymerizing the ethylene and alpha olefin, in the presence of a supported metallocene catalyst comprising a metallocene compound represented by Chemical Formula 1; and a carrier supporting the metallocene compound:

in Chemical Formula 1,
M 1 is a Group 4 transition metal;
A 1 is carbon (C), silicon (Si), or germanium (Ge);
Q 1 and Q 2 are identical to or different from each other, and each independently, hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkoxyalkyl, C 7-40 aryloxyalkyl, C 6-40 aryl, C 7-40 alkylaryl, or C 7-40 arylalkyl;
X 1 and X 2 are identical to or different from each other, and each independently, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 6-40 aryl, a nitro group, an amido group, C 1-20 alkylsilyl, C 1-20 alkoxy, or C 1-20 sulfonate group;
C 1 and C 2 are identical to or different from each other, and each independently, represented by one of Chemical Formula 2a, 2b, or 2c,

in Chemical Formulas 2a, 2b, and 2c, R 1 to R 22 are identical to or different from each other, and each independently, hydrogen, halogen, C 1-20 alkyl, C 1-20 haloalkyl, C 2-20 alkenyl, C 1-20 alkylsilyl, C 1-20 silylalkyl, C 1-20 alkoxysilyl, C 1-20 alkoxy, C 6-40 aryl, C 7-40 alkylaryl, or C 7-40 arylalkyl, and two or more neighboring groups of R 15 to R 22 are optionally connected with each other to form a substituted or unsubstituted aliphatic or aromatic ring;
* represents a site binding to A 1 , and
· represents a site binding to M 1 .

7. The polyolefin according to claim 6 , wherein the metallocene compound is represented by any one of the following structural formulas:

8. The polyolefin according to claim 1 , wherein the ASL fi (<8 nm) is 14% to 23%.

9. The polyolefin according to claim 1 , wherein the ASL fi (>30 nm) is 14% to 28%.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Sung Min
• Lee Jeongkyu
• Lee Jinyoung
• Park Sung Ho
• Kim Seyoung
• Bae Ilhak

Classifications

• C08F4/6428

  with an aluminoxane, i.e. a compound containing an Al-O-Al- group · CPC title

• C08F4/02

  Carriers therefor · CPC title

• C08F2420/07

  Heteroatom-substituted Cp, i.e. Cp or analog where at least one of the substituent of the Cp or analog ring is or contains a heteroatom · CPC title

• C08F2500/18

  Bulk density · CPC title

• C08F4/6465

  containing silicium · CPC title