Polyethylene resin composition

Patent metadata

Field	Value
Publication number	US-11401406-B2
Application number	US-202016976179-A
Country	US
Kind code	B2
Filing date	Feb 18, 2020
Priority date	Feb 20, 2019
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

Abstract

The present disclosure relates to a polyethylene resin composition exhibiting excellent processability and bubble stability, which can provide a film or fiber having excellent physical properties through various processes. The polyethylene resin composition includes a first polyethylene resin having a density of 0.950 g/cm3 to 0.960 g/cm3, a weight average molecular weight of 80000 g/mol to 100000 g/mol and a molecular weight distribution of 3.3 to 4.0; and a second polyethylene resin having a density of 0.950 g/cm3 to 0.960 g/cm3, a weight average molecular weight of 500000 g/mol to 600000 g/mol and a molecular weight distribution of 1.3 to 2.0.

First claim

What is claimed is:

1. A polyethylene resin composition comprising
a first polyethylene resin having a density of 0.950 g/cm 3 to 0.960 g/cm 3 , a weight average molecular weight of 80000 g/mol to 150000 g/mol and a molecular weight distribution of 3.9 to 6.0; and
a second polyethylene resin having a density of 0.950 g/cm 3 to 0.960 g/cm 3 , a weight average molecular weight of 110000 g/mol to 300000 g/mol and a molecular weight distribution of 1.5 to 3.8.

2. The polyethylene resin composition of claim 1 ,
wherein a weight ratio of the first polyethylene resin:the second polyethylene resin is 80:20 to 90:10.

3. The polyethylene resin composition of claim 1 ,
wherein the composition has a density of 0.950 g/cm 3 to 0.960 g/cm 3 , and a melt index (MI 2.16 ) of 0.5 to 0.9 measured at a temperature of 230° C. under a load of 2.16 kg in accordance with ISO 1133.

4. The polyethylene resin composition of claim 3 ,
wherein the composition has a MI 5 /MI 2.16 value of 3.5 to 4.0, which is obtained by dividing a melt index (MI 5 ) measured at a temperature of 230° C. under a load of 5.0 kg in accordance with ISO 1133 by the MI 2.16 .

5. The polyethylene resin composition of claim 3 ,
wherein the composition has a weight average molecular weight of 110000 g/mol to 150000 g/mol.

6. The polyethylene resin composition of claim 3 ,
wherein the composition has a molecular weight distribution of 4.5 to 5.3.

7. A polyethylene resin film comprising the polyethylene resin composition according to claim 1 .

8. The polyethylene resin film of claim 7 ,
which is a cast film or a blown film.

9. A fiber comprising the polyethylene resin composition according to claim 1 .

10. A method of preparing a fiber comprising the step of cutting and stretching the polyethylene resin film of claim 7 .

11. The polyethylene resin composition of claim 1 ,
wherein each of the first and second polyethylene resins is a copolymer of ethylene and an alpha olefin having 3 or more carbon atoms.

12. The polyethylene resin composition of claim 11 ,
wherein the alpha olefin is 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 a mixture thereof.

Assignees

• Lg Chemical Ltd

Inventors

• Song Jisoo
• Jang Chang Hwan
• Lee Hyojoon
• Choi Yi Young
• Kim Sun Mi

Classifications

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08L23/06 Primary

  Polyethylene · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• D01D5/426

  by cutting films · CPC title

• C08L2207/062

  HDPE · CPC title