# US 2018/0022905 A1 · Hdpe

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- Number: US 2018/0022905 A1
- Document ID: US20180022905A1
- Status: Published application
- Kind: A1
- Application number: 15/540,094
- Filed: 2015-12-29
- Published: 2018-01-25
- Earliest claimed: 2014-12-30
- Assignees: Abu Dhabi Polymers Co. Ltd (Borouge) LLC.; Borealis AG
- Applicants: Abu Dhabi Polymers Company Limited (Borouge) LLC; Borealis AG
- Inventors: Andrey BURYAK; Ashish KUMAR
- Web page: https://patentgrep.com/patent/US20180022905A1

## CPC

- C08L 23/06: Polyethylene
- C08L 23/04: Homopolymers or copolymers of ethene
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08F 2/001: {Multistage polymerisation processes characterised by a change in reactor conditions without deactivating the intermediate polymer (C08F295/00, C08F297/00 take precedence)}
- C08L 2207/062: HDPE
- C08L 2314/02: Ziegler natta catalyst
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A multimodal polyethylene copolymer comprising: (III) 35 to 55 wt % of a lower molecular weight ethylene homopolymer component having an MFR2 of 200 to 400 g/10 min; (IV) 45 to 65 wt % of a higher molecular weight ethylene copolymer component of ethylene and at least one C3-12 alpha olefin comonomer; 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.

## Claims

### Claim 1

A multimodal polyethylene copolymer comprising:
(I) 35 to 55 wt % of a lower molecular weight ethylene homopolymer component having an MFR2 of 200 to 400 g/10 min;
(II) 45 to 65 wt % of a higher molecular weight ethylene copolymer component of ethylene and at least one C3-12 alpha olefin comonomer;
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.

### Claim 2 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 having an Mw/Mn of more than 10.0.

### Claim 3 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 having MFR2 2.0 to 4.9 g/10 min, preferably 2.5 to 4.9 g/10 min, more preferably 3.0 to 4.9 g/10 min.

### Claim 4 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 prepared using a Ziegler Natta catalyst.

### Claim 5 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 wherein said HMW copolymer component comprises at least one C3-12 alpha olefin, preferably but-1-ene, hex-1-ene and oct-1-ene.

### Claim 6 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 having 45 to 60 wt %, preferably 48 to 52 wt % of a HMW component (II) and 40 to 55 wt %, preferably 52 to 48 wt % LMW component (I).

### Claim 7 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 having a shear thinning index (SHI 2.7/210) in the range of 7.0 to 18.0, preferably 8.0 to 15.0.

### Claim 8 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 wherein said copolymer is a copolymer with the comonomer 1-butene.

### Claim 9 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 having an ESCR of more than 20 hrs, such as 20 to 59 hrs.

### Claim 10 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 having a charpy impact strength measured at 23° C. of 4.0 to 10.0 kJ/m2, such as 5.0 to 8.0 kJ/m2.

### Claim 11 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 wherein the spiral flow length under conditions of 190° C. at 1000 bar pressure is 14.0 to 21.0 cm, preferably 16.0 to 19.0 cm and/or
the spiral flow length under conditions of 220° C. at 1000 bars is 16.0 to 24.0 cm, preferably 17.5 to 20.0 cm.

### Claim 12 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 having a density of 956 to 962 kg/m3, preferably 956 to 959 kg/m3.

### Claim 13 (depends on 1)

A multimodal polyethylene copolymer as claimed in claim 1 comprising:
(I) 40 to 55 wt % of a lower molecular weight ethylene homopolymer component having an MFR2 of 200 to 400 g/10 min;
(II) 45 to 60 wt % of a higher molecular weight ethylene copolymer component of ethylene and at least one C3-12 alpha olefin comonomer;
wherein said multimodal polyethylene copolymer has a density of 956 to 959 kg/m3, an MFR2 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; preferably
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.

### Claim 14 (depends on 1)

An injection or compression moulded article, such as a cap or closure e.g. for a non carbonated beverage container, comprising a copolymer as claimed in claim 1.

### Claim 15 (depends on 1)

Use of the copolymer as claimed in claim 1 in the manufacture of a injection or compression moulded article, such as a cap or closure e.g. for a non carbonated beverage container.

### Claim 16 (depends on 1)

A process for the preparation of a 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 a lower molecular weight ethylene homopolymer component having an MFR2 of 200 to 400 g/10 min; and subsequently
polymerising ethylene and at least one C3-12 alpha olefin comonomer in the presence of component (I) and in the presence of the same Ziegler Natta catalyst so as to form 65 to 45 wt % of a higher molecular weight component (II).