Polyethylene composition and film having outstanding properties

Patent metadata

Field	Value
Publication number	US-11753533-B2
Application number	US-202117553358-A
Country	US
Kind code	B2
Filing date	Dec 16, 2021
Priority date	Jul 11, 2018
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A polyethylene composition including a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution M w /M n of <2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 50,000 to 200,000 and a molecular weight distribution M w /M n of <2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 200,000 and a molecular weight distribution M w /M n of <2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene.

First claim

What is claimed is:

1. A polyethylene composition which when made into a film layer having a thickness of about 1 mil exhibits a machine direction (MD) 1% secant modulus of ≥200 MPa and oxygen transmission rate (OTR) of ≥600 cm 3 per 100 inch 2 per day, and when made into a film layer having a thickness of about 2 mil exhibits a seal initiation temperature (SIT) of ≤85° C., and an area of hot tack window (AHTW) of ≥220 Newtons·° C.

2. The polyethylene composition of claim 1 , wherein the 1 mil film exhibits a MD 1% secant modulus of ≥210 MPa.

3. The polyethylene composition of claim 1 , wherein the 1 mil film exhibits a MD 1% secant modulus of ≥230 MPa.

4. The polyethylene composition of claim 1 , wherein the 1 mil film exhibits a MD 1% secant modulus of 200 MPa to 270 MPa.

5. The polyethylene composition of claim 1 , wherein the 1 mil film exhibits an oxygen transmission rate (OTR) of ≥650 cm 3 per 100 inch 2 .

6. The polyethylene composition of claim 1 , wherein the 1 mil film exhibits an oxygen transmission rate (OTR) of ≥700 cm 3 per 100 inch 2 .

7. The polyethylene composition of claim 1 , wherein the 1 mil film exhibits an oxygen transmission rate (OTR) of from 600 to 800 cm 3 per 100 inch 2 .

8. The polyethylene composition of claim 1 , wherein the 1 mil film exhibits an oxygen transmission rate (OTR) of from 650 to 750 cm 3 per 100 inch 2 .

9. The polyethylene composition of claim 1 , wherein the film layer having a thickness of about 2 mil exhibits a SIT of 70° C. to 80° C.

10. The polyethylene composition of claim 1 , wherein the film layer having a thickness of about 2 mil exhibits a AHTW of 220 to 290 Newtons·° C.

11. A polyethylene composition which when made into a film layer having a thickness of about 1 mil exhibits a machine direction (MD) 1% secant modulus of ≥200 MPa, an oxygen transmission rate (OTR) of ≥600 cm 3 per 100 inch 2 per day, a dart impact strength of ≥400 g/mil and a machine direction (MD) tear strength of ≥400 g/mil, and when made into a film layer having a thickness of about 2 mil exhibits a seal initiation temperature (SIT) of ≤85° C., and an area of hot tack window (AHTW) of ≥220 Newtons·° C.

12. The polyethylene composition of claim 11 , wherein the 1 mil film exhibits a MD 1% secant modulus of ≥210 MPa.

13. The polyethylene composition of claim 11 , wherein the 1 mil film exhibits a MD 1% secant modulus of 200 MPa to 270 MPa.

14. The polyethylene composition of claim 11 , wherein the 1 mil film exhibits a dart impact strength of 400 g/mil to 600 g/mil.

15. The polyethylene composition of claim 11 , wherein the 1 mil film exhibits an oxygen transmission rate (OTR) of ≥650 cm 3 per 100 inch 2 .

16. The polyethylene composition of claim 11 , wherein the 1 mil film exhibits an oxygen transmission rate (OTR) of from 600 to 800 cm 3 per 100 inch 2 .

17. The polyethylene composition of claim 11 , wherein the 1 mil film exhibits an oxygen transmission rate (OTR) of ≥700 cm 3 per 100 inch 2 .

18. The polyethylene composition of claim 11 , wherein the 1 mil film exhibits a tear strength of from 400 g/mil to 450 g/mil.

19. The polyethylene composition of claim 11 , wherein the film layer having a thickness of about 2 mil exhibits a SIT of 70° C. to 80° C.

20. The polyethylene composition of claim 11 , wherein the film layer having a thickness of about 2 mil exhibits a AHTW of 220 to 290 Newtons·° C.

Assignees

• Nova Chem Int Sa

Inventors

• Wang Xiaochuan
• Zoricak Peter
• Molloy Brian
• Wang Qinyan
• Vanasseldonk Lawrence
• Aubee Norman

Classifications

• C08F210/16 Primary

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

• C08L23/08 Primary

  Copolymers of ethene (C08L23/16 takes precedence) · CPC title

• C08L23/06 Primary

  Polyethylene · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08F4/65908

  in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+ · CPC title