Hdpe

Patent metadata

Field	Value
Publication number	US-10414910-B2
Application number	US-201515540094-A
Country	US
Kind code	B2
Filing date	Dec 29, 2015
Priority date	Dec 30, 2014
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

wherein said multimodal polyethylene copolymer has a density of 955 to 962 kg/m3, an MFR2 of 2.0 to 10 g/10 min and an Mw/Mn of more than 9.0.

First claim

The invention claimed is:

1. A cap or closure comprising a multimodal polyethylene copolymer comprising:
(I) 35 to 55 wt % of an ethylene homopolymer component having an MFR 2 of 200 to 400 g/10 min;
(II) 45 to 65 wt % of an ethylene copolymer component of ethylene and at least one C3-12 alpha olefin comonomer having a higher molecular weight than the ethylene homopolymer;
wherein said multimodal polyethylene copolymer has a density of 955 to 962 kg/m 3 , an MFR 2 of 2.0 to 10 g/10 min, an Mw/Mn of more than 9.0 and of 30.0 or below, and a shear thinning index (SHI 2.7/210) in the range of 7.0 to 18.0.

2. A cap or closure as claimed in claim 1 wherein said multimodal polyethylene copolymer has an Mw/Mn of more than 10.0.

3. A cap or closure as claimed in claim 1 wherein said multimodal polyethylene copolymer has an MFR 2 of 2.0 to 4.9 g/10 min.

4. A cap or closure as claimed in claim 1 wherein said multimodal polyethylene copolymer is prepared using a Ziegler Natta catalyst.

5. A cap or closure as claimed in claim 1 wherein said copolymer component comprises at least one C3-12 alpha olefin.

6. A cap or closure as claimed in claim 1 wherein said multimodal polyethylene copolymer has 45 to 60 wt % of the ethylene copolymer a component and 40 to 55 wt % of the ethylene homopolymer component.

7. A cap or closure as claimed in claim 1 wherein said multimodal polyethylene copolymer has a shear thinning index (SHI 2.7/210) in the range of 8.0 to 15.0.

8. A cap or closure as claimed in claim 1 wherein said multimodal polyethylene copolymer is a copolymer with a comonomer 1-butene.

9. A cap or closure as claimed in claim 1 wherein said multimodal polyethylene copolymer has an ESCR of more than 20 hrs.

10. A cap or closure as claimed in claim 1 wherein said multimodal polyethylene copolymer has a charpy impact strength measured at 23° C. of 4.0 to 10.0 kJ/m 2 .

11. A cap or closure as claimed in claim 1 wherein a spiral flow length of the multimodal polyethylene copolymer under conditions of 190° C. at 1000 bar pressure is 14.0 to 21.0 cm and/or
the spiral flow length of the multimodal polyethylene copolymer under conditions of 220° C. at 1000 bars is 16.0 to 24.0 cm.

12. A cap or closure as claimed in claim 1 wherein said multimodal polyethylene copolymer has a density of 956 to 962 kg/m 3 .

13. A cap or closure as claimed in claim 1 wherein said multimodal polyethylene copolymer comprises:
(I) 40 to 55 wt % of the weight ethylene homopolymer component having an MFR 2 of 200 to 400 g/10 min;
(II) 45 to 60 wt % of the ethylene copolymer component of ethylene and at least one C3-12 alpha olefin comonomer having a higher molecular weight than the ethylene homopolymer;
wherein said multimodal polyethylene copolymer has a density of 956 to 959 kg/m 3 , an MFR 2 of 2.0 to 4.9 g/10 min, an ESCR of 20 to 59 hrs, an SHI (2.7/210) of 8.0 to 15.0 and an Mw/Mn of more than 9.0.

14. A cap or closure as claimed in claim 1 which is injection or compression moulded.

15. A process for the preparation of the polyethylene copolymer as claimed in claim 1 comprising:
polymerising ethylene in the presence of a Ziegler Natta catalyst so as to form 35 to 55 wt % of the ethylene homopolymer component having an MFR 2 of 200 to 400 g/10 min; and subsequently
polymerising ethylene and the at least one C3-12 alpha olefin comonomer in the presence of the ethylene homopolymer component and in the presence of the same Ziegler Natta catalyst so as to form 65 to 45 wt % of the ethylene copolymer component having a higher molecular weight than the ethylene homopolymer component.

16. A cap or closure as claimed in claim 3 wherein said multimodal polyethylene copolymer has an MFR 2 of 3.0 to 4.9 g/10 min.

17. A cap or closure as claimed in claim 5 wherein said copolymer component comprises but-1-ene, hex-1-ene or oct-1-ene.

18. A cap or closure as claimed in claim 6 having 48 to 52 wt % of the ethylene copolymer component and 52 to 48 wt % of the ethylene homopolymer component.

19. A cap or closure as claimed in claim 11 wherein the spiral flow length under conditions of 190° C. at 1000 bar pressure is 16.0 to 19.0 cm and/or
the spiral flow length under conditions of 220° C. at 1000 bars is 17.5 to 20.0 cm.

20. A cap or closure as claimed in claim 13
wherein the spiral flow length under conditions of 190° C. at 1000 bar pressure is 16.0 to 21.0 cm; and/or
the spiral flow length under conditions of 220° C. at 1000 bars is 17.5 to 20.0 cm.

Assignees

• Abu Dhabi Polymers Company Ltd Borouge Llc
• Borealis Ag

Inventors

• Buryak Andrey
• Kumar Ashish

Classifications

• C08F2/001

  Multistage polymerisation processes characterised by a change in reactor conditions without deactivating the intermediate polymer (C08F295/00, C08F297/00 take precedence) · CPC title

• C08L23/04

  Homopolymers or copolymers of ethene · CPC title

• C08L2207/062

  HDPE · CPC title

• C08L2314/02

  Ziegler natta catalyst · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title