Polyolefin

Patent metadata

Field	Value
Publication number	US-11987655-B2
Application number	US-201917278005-A
Country	US
Kind code	B2
Filing date	Dec 20, 2019
Priority date	Dec 21, 2018
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

The present invention relates to polyolefin. More specifically, the present invention relate s to polyolefin having excellent dart drop impact strength, and exhibiting improved transparency and satisfying one of the following 1)˜4):1) when density is 0.9165 g/cm3 or more and less than 0.9175 g/cm3, the content of SCB (Short Chain Branch) is 9.5 to 10.5 wt %,2) when density is 0.9175 g/cm3 or more and less than 0.9185 g/cm3, the content of SCB (Short Chain Branch) is 9.0 to 10.0 wt %,3) when density is 0.9185 g/cm3 or more and less than 0.9195 g/cm3, the content of SCB (Short Chain Branch) is 8.5 to 9.5 wt %,4) when density is 0.9195 g/cm3 or more and less than 0.9205 g/cm3, the content of SCB (Short Chain Branch) is 7.5 to 8.5 wt %,wherein the density is measured according to ASTM D1505.

First claim

What is claimed is:

1. A polyolefin satisfying one of the following 1 to 4:
1) when a density is 0.9165 g/cm 3 or more and less than 0.9175 g/cm 3 , a content of SCB (Short Chain Branch) is 9.5 to 10.5 wt %,
2) when a density is 0.9175 g/cm 3 or more and less than 0.9185 g/cm 3 , a content of SCB (Short Chain Branch) is 9.0 to 10.0 wt %,
3) when a density is 0.9185 g/cm 3 or more and less than 0.9195 g/cm 3 , a content of SCB (Short Chain Branch) is 8.5 to 9.5 wt %,
4) when a density is 0.9195 g/cm 3 or more and less than 0.9205 g/cm 3 , a content of SCB (Short Chain Branch) is 7.5 to 8.5 wt %,
wherein the density is measured according to ASTM D1505,
wherein the content of SCB is measured using 1 H NMR spectroscopy, and
wherein the polyolefin has a melt index (MI 2.16 ) measured under a load of 2.16 kg and a temperature of 190° C. according to ASTM D1238 of 0.5 to 1.5 g/10 min.

2. The polyolefin according to claim 1 , wherein a polyolefin film (BUR 2.3, film thickness 55 to 65 μm), prepared from the polyolefin using a film applicator, has a haze 11% or less, measured according to ISO 13468.

3. The polyolefin according to claim 1 , wherein a polyolefin film (BUR 2.3, film thickness 55 to 65 μm), prepared from the polyolefin using a film applicator, has a dart drop impact strength of 850 g or more, measured according to ASTM D 1709 [Method A].

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

5. The polyolefin according to claim 4 , wherein the alpha olefin includes 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, or 1-eicosene.

6. 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 a compound represented by Chemical Formula 1; one or more second metallocene compounds selected from a compound represented by Chemical Formula 2; and a carrier supporting the first and second metallocene compounds,

in Chemical Formula 1,
Q 1 and Q 2 are identical to or different from each other, and each independently, halogen, a C1-C20 alkyl group, a C2-C20 alkenyl group, a C2-C20 alkoxyalkyl group, a C6-C20 aryl group, a C7-C20 alkylaryl group, or a C7-C20 arylalkyl group;
T 1 is carbon, silicon or germanium;
M 1 is a Group 4 transition metal;
X 1 and X 2 are identical to or different from each other, and each independently, halogen, a C1-C20 alkyl group, a C2-C20 alkenyl group, a C6-C20 aryl group, a nitro group, an amido group, a C1-C20 alkylsilyl group, a C1-C20 alkoxy group, or a C1-C20 sulfonate group; and
R 1 to R 14 are identical to or different from each other, and each independently, hydrogen, halogen, a C1-C20 alkyl group, a C1-C20 haloalkyl group, a C2-C20 alkenyl group, a C1-C20 alkylsilyl group, a C1-C20 silylalkyl group, a C1-C20 alkoxysilyl group, a C1-C20 alkoxy group, a C6-C20 aryl group, a C7-C20 alkylaryl group, or a C7-C20 arylalkyl group, or two or more neighboring groups of R 1 to R 14 are connected with each other and together with the carbon atoms to which they are attached to form a substituted or unsubstituted aliphatic or aromatic ring;

in Chemical Formula 2,
Q 3 and Q 4 are identical to or different from each other, and each independently, halogen, a C1-C20 alkyl group, a C2-C20 alkenyl group, a C2-C20 alkoxyalkyl group, a C6-C20 aryl group, a C7-C20 alkylaryl group, or a C7-C20 arylalkyl group;
T 2 is carbon, silicon or germanium;
M 2 is a Group 4 transition metal;
X 3 and X 4 are identical to or different from each other, and each independently, halogen, a C1-C20 alkyl group, a C2-C20 alkenyl group, a C6-C20 aryl group, a nitro group, an amido group, a C1-C20 alkylsilyl group, a C1-C20 alkoxy group, or a C1-C20 sulfonate group; and
R 15 to R 28 are identical to or different from each other, and each independently, hydrogen, halogen, a C1-C20 alkyl group, a C1-C20 haloalkyl group, a C2-C20 alkenyl group, a C2-C20 alkoxyalkyl group, a C1-C20 alkylsilyl group, a C1-C20 silylalkyl group, a C1-C20 alkoxysilyl group, a C1-C20 alkoxy group, a C6-C20 aryl group, a C7-C20 alkylaryl group, or a C7-C20 arylalkyl group, provided that R 20 and R 24 are identical to or different from each other, and each independently, a C1 to C20 alkyl group, or two or more neighboring groups of R15 to R 28 are connected with each other and along with the carbon atoms to which they are attached to form a substituted or unsubstituted aliphatic or aromatic ring.

7. The polyolefin according to claim 6 , wherein the compound represented by Chemical Formula 1 is any one of compounds represented by the following structural formulas:

8. The polyolefin according to claim 6 , wherein the compound represented by Chemical Formula 2 is any one of compounds represented by the following structural formulas:

9. The polyolefin according to claim 6 , wherein a mole ratio of the first and second metallocene compounds is 1:1 to 10:1.

10. The polyolefin according to claim 6 , which has an ethylene sequence inhomogeneity(I) calculated by Equation 1 of 1.25 to 1.40, when analyzed by SSA(Successive Self-nucleation and Annealing):
Inhomogeneity (I)= L w /L n   [Equation 1]

in the Equation 1,
L w is weighted average (unit:nm) of ESL (Ethylene Sequence Length), and L n is arithmetic mean (unit:nm) of ESL (Ethylene Sequence Length).

11. The polyolefin according to claim 10 , wherein the L n is calculated by Equation 2, and the L w is calculated by Equation 3:

⁢

L
n

=

S
1

⁢

L
1

+

S
2

⁢

L
2

+

S
3

⁢

Assignees

• Lg Chemical Ltd

Inventors

• Lee Sung Min
• Lee Jeongkyu
• Lee Hyojoon
• Kim Seyoung
• Park Sung Ho
• Im Seul Ki
• Lee Jinyoung
• Jang Chang Hwan
• Hong Daesik
• Song Jisoo

Classifications

• C08F210/16 Primary

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

• C08F2500/10

  Short chain branches · 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

• C08F4/65912

  in combination with an organoaluminium compound · CPC title

• C08F4/65916

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