Polyethylene resin film

Patent metadata

Field	Value
Publication number	US-11118040-B2
Application number	US-201816487715-A
Country	US
Kind code	B2
Filing date	Dec 3, 2018
Priority date	Dec 18, 2017
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

Provided is a polyethylene resin film exhibiting more improved transparency while exhibiting excellent processability and mechanical properties. The polyethylene resin film having a density of 0.910 g/cm 3 to 0.930 g/cm 3 , and a haze of 10% or less at a thickness of 90 μm to 110 μm includes a first polyethylene resin and a second polyethylene resin at a weight ratio of 6:4 to 8:2, wherein the first polyethylene resin has an MFRR (21.6/2.16) value of 27 to 40, and the second polyethylene resin has an MFRR (21.6/2.16) value of 15 to 23, and the MFRR (21.6/2.16) value is obtained by dividing a melt flow rate (MFR 21.6 ) measured at a temperature of 230° C. under a load of 21.6 kg in accordance with ISO 1133 by a melt flow rate (MFR 2.16 ) measured at a temperature of 230° C. under a load of 2.16 kg in accordance with ISO 1133.

First claim

The invention claimed is:

1. A polyethylene resin film having a density of 0.910 g/cm 3 to 0.930 g/cm 3 , a haze of 10% or less at a thickness of 90 μm to 110 μm, and a MFRR (21.6/2.16) value of 23 to 27,
comprising a first polyethylene resin and a second polyethylene resin at a weight ratio of 6:4 to 8:2, wherein the first polyethylene resin has an MFRR (21.6/2.16) value of 27 to 40, and the second polyethylene resin has an MFRR (21.6/2.16) value of 15 to 23, and the MFRR (21.6/2.16) value is obtained by dividing a melt flow rate (MFR 21.6 ) measured at a temperature of 230° C. under a load of 21.6 kg in accordance with ISO 1133 by a melt flow rate (MFR 2.16 ) measured at a temperature of 230° C. under a load of 2.16 kg in accordance with ISO 1133.

2. The polyethylene resin film of claim 1 , wherein the first polyethylene resin has a melt strength of 60 mN or more and the second polyethylene resin has a melt strength of 50 mN or less.

3. The polyethylene resin film of claim 1 , wherein the first and second polyethylene resins have a number average molecular weight of 20,000 g/mol to 50,000 g/mol and a weight average molecular weight of 100,000 g/mol to 160,000 g/mol.

4. The polyethylene resin film of claim 1 , wherein the first and second polyethylene resins have a melt index of 0.5 g/10 min or more and less than 3 g/10 min, as measured in accordance with ASTM D1238 at a temperature of 190° C. under a load of 2.16 kg.

5. The polyethylene resin film of claim 1 , wherein the first and second polyethylene resins are a copolymer of ethylene and alpha olefin.

6. The polyethylene resin film of claim 5 , 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 mixtures thereof.

7. The polyethylene resin film of claim 5 , wherein the alpha olefin is 1-hexene.

8. The polyethylene resin film of claim 1 , wherein the polyethylene resin film has a number average molecular weight of 20,000 g/mol to 50,000 g/mol and a weight average molecular weight of 100,000 g/mol to 160,000 g/mol.

9. The polyethylene resin film of claim 1 , wherein the polyethylene resin film has a melt strength of 50 mN or more.

10. The polyethylene resin film of claim 1 , wherein the polyethylene resin film has a melt index of 0.5 g/10 min to 3 g/10 min, as measured at a temperature of 190° C. under a load of 2.16 kg.

11. The polyethylene resin film of claim 1 , wherein the first and second polyethylene resins have a density, a number average molecular weight, a weight average molecular weight, and a melt index equivalent to each other.

12. The polyethylene resin film of claim 1 , wherein the first and second polyethylene resins have a density of 0.910 g/cm 3 to 0.930 g/cm 3 .

13. The polyethylene resin film of claim 1 , wherein the first polyethylene resin has a haze of 10% to 30% in the state of a film having the same thickness, and the second polyethylene resin has a haze of more than 30% in the state of a film having the same thickness.

Assignees

• Lg Chemical Ltd

Inventors

• Cho Sol
• Choi Yi Young
• Jang Chang Hwan
• Kim Seyoung
• Lee Sung Min
• Im Seul Ki
• Lee Jinyoung
• Lee Hyojoon

Classifications

• C08F2500/11

  Melt tension or melt strength · CPC title

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• C08J2323/08

  Copolymers of ethene (C08J2323/16 takes precedence) · CPC title

• C08F2500/12

  Melt flow index or melt flow ratio · 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