Polyethylene for injection molding

Patent metadata

Field	Value
Publication number	US-9580584-B2
Application number	US-201415029744-A
Country	US
Kind code	B2
Filing date	Sep 24, 2014
Priority date	Oct 15, 2013
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

The present disclosure relates to a polyethylene composition comprising copolymers of ethylene with 1-alkenes, or mixtures of ethylene homopolymers and said copolymers of ethylene with 1-alkenes, wherein the polyethylene composition has a molar mass distribution width (MWD) M w /M n of from 7 to 15, a density of from 0.942 to 0.954 g/cm 3 , a weight average molar mass M w of from 20,000 g/mol to 500,000 g/mol, a MIE of from 1.0 to 3.0 g/10 min, a MIF of from 100 to 200 g/10 min, and a ratio MIF/MIE of from 40 to 50.

First claim

What is claimed is:

1. A polyethylene composition comprising copolymers of ethylene with C 3 -C 20 1-alkenes, or mixtures of ethylene homopolymers and copolymers of ethylene with C 3 -C 20 1-alkenes, wherein the polyethylene composition has a molar mass distribution width (MWD) M w /M n of from 7 to 15, a density of from 0.942 to 0.954 g/cm 3 , determined according to ISO 1183 at 23° C., a weight average molar mass M w of from 20,000 g/mol to 500,000 g/mol, a MIE of from 1.0 to 3.0 g/10 min, a MIF of from 100 to 200 g/10 min, and a ratio MIF/MIE of from 40 to 50, where MIE is the melt flow rate at 190° C. with a load of 2.16 kg and MIF is the melt flow rate at 190° C. with a load of 21.6 kg, both determined according to ISO 1133.

2. The polyethylene composition of claim 1 , comprising 0.7 to 20 CH 3 /1000 carbon atoms as determined by 13 C-NMR.

3. The polyethylene composition of claim 1 , comprising at least one C 3 -C 20 -alpha-olefin monomer species in an amount greater than 3.5% by weight based on the total weight of the polyethylene composition.

4. The polyethylene composition of claim 1 , comprising a vinyl group content of at least 0.6 vinyl groups/1000 C atoms, and wherein the amount of the polyethylene composition with a molar mass of below 10 6 g/mol, as determined by GPC, is above 95.5% by weight, based on the total weight of the polyethylene.

5. The polyethylene composition of claim 1 , comprising a η(vis) value of from 0.3 to 7 dl/g, wherein η(vis) is the intrinsic viscosity as determined according to ISO 1628-1 and -3 in decalin at 135° C.

6. The polyethylene composition of claim 1 , wherein the polyethylene composition is produced in one polymerization step in a single reactor by a mixed catalyst system comprising at least one metallocene.

7. The polyethylene composition of claim 6 , wherein the polyethylene composition is produced in the presence of a catalyst composition comprising at least two different single-site polymerization catalysts.

8. The polyethylene of claim 7 , obtainable by copolymerizing ethylene with one or several C 3 -C 20 -alpha-olefin monomer species at a temperature of from 20 to 200° C. and at a pressure of from 0.05 to 10 MPa.

9. The polyethylene of claim 1 , further comprising non-polymeric additives selected from the group consisting of lubricants, antioxidants, stabilizers and combinations thereof.

10. An injection molded article comprising the polyethylene composition of claim 1 .

11. The injection molded article of claim 10 , comprising a container with a volume of at least 5 L.

12. The injection molded article of claim 10 , comprising an inner part of a tank.

Assignees

• Basell Polyolefine Gmbh

Inventors

• Hoecker Bernd
• Lindner Thomas
• Bisson Peter
• Mannebach Gerd

Classifications

• C08L2314/08

  prepared by late transition metal, i.e. Ni, Pd, Pt, Co, Rh, Ir, Fe, Ru or Os, single site catalyst · CPC title

• C08F210/16 Primary

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

• C08L23/0815 Primary

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• C08F2410/04

  Dual catalyst, i.e. use of two different catalysts, where none of the catalysts is a metallocene · CPC title