Olefin polymer, preparation method of the same, and film using the same

Patent metadata

Field	Value
Publication number	US-10894843-B2
Application number	US-201816478692-A
Country	US
Kind code	B2
Filing date	Nov 29, 2018
Priority date	Dec 18, 2017
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

An olefin polymer capable of simultaneously satisfying excellent drop impact strength and transparency, a preparation method of the same, and a film using the same, can be provided. In an embodiment, an olefin polymer comprises a plurality of polymer chains, and satisfies the following conditions: i) each polymer chain of the plurality having an average number of short chain branches (SCBs) per 1000 carbon atoms of 20/1000C or more, wherein an SCB has C2 to C7 carbon atoms, ii) a molded film of the olefin polymer having a drop impact strength of 1500 g to 2400 g as measured in accordance with ASTM D1709A, wherein the molded film having a thickness of 100 μm, and iii) a molded film of the olefin polymer having a haze is 10% to 30% as measured in accordance with ASTM D1003, wherein the molded film having a thickness of 0.05 mm.

First claim

The invention claimed is:

1. An olefin polymer having a plurality of polymer chains, and satisfying the following conditions i) to iii):
i) each polymer chain of the plurality has an average number of short chain branches (SCBs) per 1000 carbon atoms of 20/1000C or more, wherein an SCB has C2 to C7 carbon atoms;
ii) a molded film of the olefin polymer has a drop impact strength of 1500 g to 2400 g as measured in accordance with ASTM D1709A, wherein the molded film has a thickness of 100 μm; and
iii) a molded film of the olefin polymer has a haze of 10% to 30% as measured in accordance with ASTM D1003, wherein the molded film has a thickness of 0.05 mm.

2. The olefin polymer of claim 1 ,
wherein the plurality of polymer chains have a range of molecular weight values defined between 0 and 1, wherein a minimum value of molecular weight in a polymer chain in the plurality is defined as 0, wherein the weight average molecular weight (Mw) of the olefin polymer is defined as 0.5, and a maximum value of a molecular weight in a polymer chain in the plurality is defined as 1, and
wherein
a maximum value for a number of SCBs per 1000 carbon atoms is found in polymer chains in the plurality having molecular weights defined between 0.8 to 1.0.

3. The olefin polymer of claim 1 ,
wherein the plurality of polymer chains have a range of molecular weight values defined between 0 and 1, wherein a minimum value of molecular weight in a polymer chain in the plurality is defined as 0, wherein the weight average molecular weight (Mw) of the olefin polymer is defined as 0.5, and a maximum value of a molecular weight in a polymer chain in the plurality is defined as 1, and wherein a minimum value for a number of SCBs per 1000 carbon atoms is found in polymer chains having molecular weights defined between 0 to 0.2.

4. The olefin polymer of claim 1 ,
wherein the olefin polymer has a molecular weight distribution (Mw/Mn) of 5 to 10.

5. The olefin polymer of claim 1 ,
wherein the olefin polymer has a melt index of 0.80 g/10 min to 0.93 g/10 min, wherein the melt index is measured at 230° C. with a load of 2.16 kg in accordance with ASTM D1238.

6. The olefin polymer of claim 1 ,
wherein the olefin polymer has a density of 0.910 g/cm 3 to 0.930 g/cm 3 as measured by ASTM 1505.

7. The olefin polymer of claim 1 ,
wherein the olefin polymer has a weight average molecular weight (Mw) of 100,000 g/mol to 150,000 g/mol.

8. A preparation method of the olefin polymer of claim 1 , comprising the step of polymerizing olefinic monomers in the presence of a supported hybrid catalyst comprising a first transition metal compound represented by the following Chemical Formula 1, a second transition metal compound represented by the following Chemical Formula 2, and a support on which the first and second transition metal compounds are supported:

wherein, in Chemical Formulae 1 and 2,
C 1 is a ligand represented by the following Chemical Formula 3,

where R 1 and R 2 are the same as or different from each other, and at least one of R 1 and R 2 is a C1 to C20 alkyl group and the other is hydrogen;
Z is —O—, —S—, —NR 3 —, or —PR 4 —,
where R 3 and R 4 are the same as or different from each other, and are each independently a halogen or a C1 to C20 alkyl group;
M 1 and M 2 are the same as or different from each other, and are each independently Ti, Zr, or Hf;
X 1 to X 4 are the same as or different from each other, and are each independently a halogen;
T is

where T 1 is C, Si, Ge, Sn, or Pb,
Y 1 is a C1 to C20 alkoxyalkyl group, and
Y 2 is a C1 to C20 alkyl group;
Cp 1 and Cp 2 are cyclopentadienyl groups;
R 7 and R 8 are the same as or different from each other, and are each independently a halogen or a C1 to C20 alkyl group; and
u and v are each independently an integer of 0 to 5.

9. The preparation method of claim 8 ,
wherein the first transition metal compound is a compound represented by the following Chemical Formula 4:

wherein, in Chemical Formula 4, R 1 and R 2 are the same as or different from each other, and at least one of R 1 and R 2 is a C1 to C20 alkyl group and the other is hydrogen,
R 3 is a C1 to C10 alkyl group,
M 1 is Ti, Zr, or Hf,
X 1 and X 2 are the same as or different from each other, and are each independently a halogen,
T 1 is C or Si,
Y 1 is a C1 to C20 alkoxyalkyl group, and
Y 2 is a C1 to C20 alkyl group.

10. The preparation method of claim 8 ,
wherein the second transition metal compound is a compound represented by the following Chemical Formula 5:

wherein, in Chemical Formula 5, R 7 and R 8 are the same as or different from each other, and are each independently a halogen or a C1 to C20 alkyl group,
M 2 is Ti, Zr, or Hf, and
X 3 and X 4 are the same as or different from each other, and are each independently a halogen.

11. The preparation method of claim 8 ,
wherein the first transition metal compound and the second transition metal compound are contained in a molar ratio of 1:0.1 to 1:0.9.

12. The preparation method of claim 8 ,
wherein the support is silica, alumina, magnesia, or a mixture thereof.

13. The preparation method of claim 8 ,
wherein the supported hybrid catalyst further comprises at least one cocatalyst selected from the group consisting of compounds represented by the following Chemical Formulae 6 to 8:
—[Al(R 9 )—O] m —  [Chemical Formula 6]

wherein, in Chemical Formula 6,
R 9 are the same as or different from each other, and each is independently a halogen, a C1 to C20 alkyl group, or a C1 to C20 alkyl group substituted with a halogen, and
m is an integer of 2 or more,
J(R 10 ) 3   [Chemical Formula 7]

wherein, in Chemical Formula 7,
R 10 are the same as or different from each other, and each is independently a halogen, a C1 to C20 alkyl group, or a C1 to C20 alkyl group substituted with a halogen, and
J is aluminum or boron,
[E-H][ZA 4 ] − or [E]+[ZA 4 ] −   [Chemical Formula 8]

wherein, in Chemical Formula 8,
E is a neutral or cationic Lewis base,
H is a hydrogen atom,
Z is a Group 13 element, and
A are the same as or different from each other, and each is independently a C6 to C20 aryl or C1 to C20 alkyl group, of which one or more hydrogen atoms are substituted or unsubstituted with a halogen, a C1 to C20 alkyl group, an alkoxy, or a phenoxy.

14. The preparation method of claim 8 ,
wherein the olefinic monomers comprise at least one selected from the group consisting of ethylene, 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 norbornene, phenylnorbornene, vinyl norbornene, dicyclopentadiene, 1,4-butadiene, 1,5-pentadiene, 1,6-hexadiene, styrene, alpha-methylstyrene, divinylbenzene, and 3-chloromethylstyrene.

15. A film comprising

Assignees

• Lg Chemical Ltd

Inventors

• Im Seul Ki
• Lee Seungmi
• Kwon Ohjoo
• Shin Eunji
• Lee Ki Soo
• Hong Daesik
• Park Sung Ho
• You Youngsuk
• Lee Jinyoung

Classifications

• 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

• C08F2500/10

  Short chain branches · CPC title

• C08F4/6491

  hydrocarbon · CPC title

• C08J2323/20

  having four to nine carbon atoms · CPC title

• C08F2500/26

  Use as polymer for film forming · CPC title