# US 8,569,434 B2 · Ethylene copolymers, catalyst system and process for preparing the same

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- Number: US 8,569,434 B2
- Document ID: US8569434B2
- Status: Granted
- Kind: B2
- Application number: 13/148,041
- Filed: 2010-02-16
- Published: 2011-12-22
- Granted: 2013-10-29
- Earliest claimed: 2009-02-20
- Assignees: Basell Polyolefine GmbH
- Applicants: Fabiana Fantinel; Shahram Mihan; Volker Dolle; Andreas Maus
- Inventors: Fabiana Fantinel; Shahram Mihan; Volker Dolle; Andreas Maus
- Web page: https://patentgrep.com/patent/US8569434B2

## CPC

- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08F 4/63912: {in combination with an organoaluminium compound}
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08F 4/6392: containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring
- C08F 2420/01: Cp or analog bridged to a non-Cp X neutral donor
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2308/00: Chemical blending or stepwise polymerisation process with the same catalyst
- C08L 2314/06: Metallocene or single site catalysts
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

An ethylene copolymer, a catalyst system suitable to prepare the ethylene copolymer, and a process to prepare such ethylene copolymer are described. The use of the ethylene copolymer as impact modifier in polyethylene and as compatibilizer in a polymer blend are also described. The ethylene copolymer has a density from 0.855 g/cm3 to 0.910 g/cm3, a polydispersity Mw/Mn lower than 3.5, comprises at least one first ethylene polymer component and at least one second ethylene polymer component having different comonomer contents so as to show at least two predetermined CRYSTAF peak temperatures.

## Claims

### Claim 1

A copolymer of ethylene with at least one alpha-olefin comonomer comprising:
at least one first ethylene polymer and at least one second ethylene polymer having different comonomer contents such that the copolymer shows at least two CRYSTAF peak temperatures,
wherein the at least two CRYSTAF peak temperatures comprise a first CRYSTAF peak temperature lower than 30° C. and a second CRYSTAF peak temperature at least 20° C. higher than the first peak temperature and higher than 50° C.; and,
wherein the copolymer has:
(i) a density from 0.855 g/cm3 to 0.910 g/cm3,
(ii) a polydispersity Mw /Mn lower than 3.5.

### Claim 2 (depends on 1)

The copolymer according to claim 1, having a polydispersity Mw/Mn from 2 to 3.

### Claim 3 (depends on 1)

The copolymer according to claim 1, wherein the first CRYSTAF peak temperature is in the range from 0° C. to 30° C.

### Claim 4 (depends on 1)

A composition comprising an ethylene copolymer according to claim 1 and an ethylene homopolymer.

### Claim 5 (depends on 1)

A composition comprising an ethylene copolymer according to claim 1 and a polymer blend.