Semiconductive polyolefin composition comprising conductive filler

Patent metadata

Field	Value
Publication number	US-9543056-B2
Application number	US-201113639554-A
Country	US
Kind code	B2
Filing date	Apr 5, 2011
Priority date	Apr 6, 2010
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

The present invention relates to a semiconductive polyolefin composition comprising graphene nanoplatelets. It also relates to a semiconductive polyolefin composition comprising the combination of graphene nanoplatelets and carbon black. Moreover, the present invention is related to a process for producing the semiconductive polyolefin composition as well to the use of the semiconductive polyolefin composition in a power cable. Further, the invention is also related to an article, preferably a power cable comprising at least one semiconductive layer comprising said polyolefin composition.

First claim

The invention claimed is:

1. A power cable, comprising a semiconductive polyolefin composition comprising
(a) an olefin polymer base resin, and
(b) graphene nanoplatelets,

wherein the graphene nanoplatelets (b) have an average thickness in the range of from 1 nm to 50 nm and a lateral diameter of 200 μm or less, both measured with atomic force microscopy (AFM), and a surface roughness characterized by R_RMS, measured on extruded samples, is 100 micrometer or less.

2. The power cable according to claim 1 , wherein the graphene nanoplatelets (b) are contained in the range of from 4 to 15 wt %, based on the total weight of the polyolefin composition.

3. The power cable according to claim 1 , wherein the graphene nanoplatelets (b) are contained in the range of from 6 to 12 wt %, based on the total weight of the polyolefin composition.

4. The power cable according to claim 1 , further comprising
(c) a solid conductive filler different from (b).

5. The power cable according to claim 4 , wherein the solid conductive filler (c) is carbon black.

6. The power cable according to claim 5 , wherein said carbon black fulfills at least one of the following requirements:
(a) an iodine number of at least 30 mg/g, measured in accordance with ASTM D 1510,
(b) a DBP oil adsorption number of at least 30 ml/100 g, measured in accordance with ASTM D 2414,
(c) a BET nitrogen surface area of at least 30 m 2 /g, measured in accordance with ASTM D 3037,
(d) a statistical surface area (STSA) of at least 30 m 2 /g measured in accordance with ASTM D5816.

7. The power cable according to claim 5 , wherein said carbon black fulfills a combination of the following requirements:
(a) an iodine number of at least 30 mg/g, measured in accordance with ASTM D 1510,
(b) a DBP oil adsorption number of at least 30 ml/100 g, measured in accordance with ASTM D 2414,
(c) a BET nitrogen surface area of at least 30 m 2 /g, measured in accordance with ASTM D 3037,
(d) a statistical surface area (STSA) of at least 30 m 2 /g measured in accordance with ASTM D5816.

8. The power cable according to claim 5 , wherein said carbon black fulfills all of the following requirements:
(a) an iodine number of at least 30 mg/g, measured in accordance with ASTM D 1510,
(b) a DBP oil adsorption number of at least 30 ml/100 g, measured in accordance with ASTM D 2414,
(c) a BET nitrogen surface area of at least 30 m 2 /g, measured in accordance with ASTM D 3037,
(d) a statistical surface area (STSA) of at least 30 m 2 /g measured in accordance with ASTM D5816.

9. The power cable according to claim 4 , wherein the solid conductive filler (c) is contained in the composition with a fraction of 5 to 95 wt %, in relation to the weight of the graphene nanoplatelets (b).

10. The power cable according to claim 1 , wherein the average thickness of the graphene nanoplatelets (b) is in the range of from 1 nm to 40 nm.

11. The power cable according to claim 1 , wherein the graphene nanoplatelets (b) have an aspect ratio of diameter to thickness that is 50 or more, measured by atomic force microscopy.

12. The power cable according to claim 1 , wherein the graphene nanoplatelets (b) are contained in the range of from 2 to 20 wt %, based on the total weight of the polyolefin composition.

13. The power cable according to claim 1 , wherein the olefin polymer base resin (a) comprises an ethylene homo- or copolymer or a propylene homo- or copolymer.

14. The power cable according to claim 1 , wherein the olefin polymer base resin (a) comprises a copolymer of ethylene with at least one comonomer selected from unsaturated esters.

15. The power cable according to claim 14 , wherein the unsaturated ester is selected from vinyl esters, acrylic acid or methacrylic acid esters.

16. The power cable according to claim 15 , wherein the unsaturated ester is selected from methyl acrylate, ethyl acrylate or butyl acrylate.

17. The power cable according to claim 16 , wherein an amount of acrylate comonomer units is from 1 to 15 mol % with regard to a total amount of monomers in the copolymer of the composition.

18. The power cable according to claim 1 , having a ratio of MFR 2 of the polyolefin composition to the MFR 2 of the olefin polymer base resin of 0.30 or more, wherein the MFR 2 is measured at a load of 2.16 kg in accordance to ISO 1133, at a temperature of 190° C. for polyethylene and at a temperature of 230° C. for polypropylene.

Assignees

• Svanberg Christer
• Pham Tung
• Malik Muhammad Ali
• Costa Francis
• Liu Yi
• Uematsu Takashi
• Gkourmpis Thomas
• Borealis Ag

Inventors

• Svanberg Christer
• Pham Tung
• Malik Muhammad Ali
• Costa Francis
• Liu Yi
• Uematsu Takashi
• Gkourmpis Thomas

Classifications

• H01B1/24 Primary

  the conductive material comprising carbon-silicon compounds, carbon or silicon · CPC title

• C08L23/02 Primary

  not modified by chemical after-treatment · CPC title

• C08K2201/016

  Additives defined by their aspect ratio · CPC title

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08K3/04

  Carbon · CPC title