Single site polymer

Patent metadata

Field	Value
Publication number	US-9534711-B2
Application number	US-201113881468-A
Country	US
Kind code	B2
Filing date	Oct 26, 2011
Priority date	Oct 28, 2010
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A single site catalysed ethylene polymer including ethylene and optionally at least one comonomer having a Mw/Mn of less than 5 and wherein the total amount of unsaturations of the ethylene polymer is at least 0.8.

First claim

We claim:

1. A single site catalysed ethylene polymer comprising ethylene and optionally at least one comonomer having a Mw/Mn of less than 5, a density of at least 930 kg/m 3 and wherein the total amount of unsaturations of the ethylene polymer (per average molecule) is at least 0.8.

2. A polymer as claimed in claim 1 having a density of 940 to 955 kg/m 3 .

3. A polymer as claimed in claim 1 having an ethylene content of at least 85 wt %.

4. A polymer as claimed in claim 1 having an MFR 21 of 5 to 50 g/10 min.

5. A polymer as claimed in claim 1 having an Mn value of 25,000 to 75,000.

6. A polymer as claimed in claim 1 having an Mw/Mn of less than 3.

7. A polymer as claimed in claim 1 having carbon-carbon double bonds/1000 carbon atoms in a total amount of at least 0.2/1000 carbon atoms.

8. A polymer as claimed in claim 1 being a homopolymer.

9. A polymer as claimed in claim 1 made using a metallocene catalyst.

10. A polymer as claimed in claim 1 made by a catalyst of formula (I)
Cp′ 2 M′X′ 2

wherein each X′ is halogen, C 1-6 alkyl, benzyl or hydrogen;
M′ is Hf or Zr;
Cp′ is a substituted or unsubstituted cyclopentadienyl or indenyl group.

11. A composition comprising an ethylene polymer as claimed in claim 1 .

12. A process for the preparation of a crosslinked ethylene polymer pipe comprising polymerizing ethylene or ethylene and at least one comonomer in the presence of a single site catalyst to form an ethylene homopolymer or copolymer having a Mw/Mn of less than 5 and wherein the total amount of unsaturations of the ethylene polymer (per average molecule) is at least 0.8 into a pipe by extrusion and crosslinking in the absence of hydrogen.

13. A cross-linked pipe comprising a cross-linked single site catalysed ethylene polymer comprising an ethylene homopolymer or copolymer having a Mw/Mn of less than 5 and wherein the total amount of unsaturations of the ethylene homopolymer or copolymer (per average molecule) is at least 0.8.

14. A pipe as claimed in claim 13 wherein said pipe has a torque max value of at least 7 dNm.

15. A polymer as claimed in claim 10 made by a catalyst of Formula (I) wherein Cp′ is substituted by one or more C 1-10 hydrocarbyl groups.

16. A polymer as claimed in claim 10 made by a catalyst of Formula (I) wherein said Cp′ substituents are bridged.

17. A polymer as claimed in claim 10 made by a catalyst of Formula (I) wherein said Cp′ substituents are bridged with an ethylene or dimethylsilyl link.

18. A process comprising polymerising ethylene or ethylene and at least one comonomer in the presence of a single site catalyst to prepare a single site catalysed ethylene polymer comprising ethylene and optionally at least one comonomer having a Mw/Mn of less than 5, a density of at least 930 kg/m 3 and wherein the total amount of unsaturations of the ethylene polymer (per average molecule) is at least 0.8.

Assignees

• Palmlöf Magnus
• Ommundsen Espen
• BJÅLAND Anne Britt
• Krajete Alexander
• Borealis Ag

Inventors

• Palmlöf Magnus
• Ommundsen Espen
• BJÅLAND Anne Britt
• Krajete Alexander

Classifications

• C08F2500/19

  Shear ratio or shear ratio index · CPC title

• C08F10/02 Primary

  Ethene · CPC title

• C08F2500/17

  Viscosity · CPC title

• B29C47/0004

  Operations & Transport · mapped topic

• F16L9/12 Primary

  of plastics with or without reinforcement (F16L9/16 - F16L9/22 take precedence) · CPC title