Crosslinked polyethylene composition

Patent metadata

Field	Value
Publication number	US-10774204-B2
Application number	US-201716084781-A
Country	US
Kind code	B2
Filing date	Oct 30, 2017
Priority date	Nov 10, 2016
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

The crosslinked polyethylene composition according to the present invention is characterized in that the migration of additives is inhibited due to low oil content of low density polyethylene, and thus, when preparing crosslinked polyethylene using the same, stable extrusion property is exhibited, thus reducing exterior deviation of the crosslinked polyethylene.

First claim

The invention claimed is:

1. A crosslinked polyethylene composition comprising:
100 parts by weight of low density polyethylene(LDPE) having an oil content of 700 ppm or less,
0.1 to 10 parts by weight of a crosslinking agent, and
0.1 to 1.0 parts by weight of an antioxidant, and

wherein the oil content is measured and calculated by dividing the mass of the components extracted for 4 hours after putting 500 g of the LDPE in 2 L of water of 100° C., by 500 g.

2. The crosslinked polyethylene composition according to claim 1 , wherein the oil content of the low density polyethylene is 300 ppm or less.

3. The crosslinked polyethylene composition according to claim 1 , wherein the crosslinking agent is one or more selected from the group consisting of dicumyl peroxide, benzoyl peroxide, lauryl peroxide, t-butyl cumyl peroxide, di(t-butyl peroxyisopropyl)benzene, 2,5-dimethyl-2,5-di(t-butyl peroxy)hexane, and di-t-butyl peroxide.

4. The crosslinked polyethylene composition according to claim 1 , wherein the antioxidant is one or more selected from the group consisting of 4,4′-thiobis(2-t-butyl-5-methylphenol), 4,6-bis(octylthiomethyl)-o-cresol, 2,2′-thio diethyl bis-[3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate], pentaerythrityl-tetrakis-[3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate], 4,4′-thiobis(2-methyl-6-t-butylphenol), 2,2′-thiobis(6-t-butyl-4-methylphenol), octadecyl-[3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate], triethyleneglycol-bis-[3-(3-t-butyl-4-hydroxy-5-methylphenol)propionate], thiodiethylene bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], 6,6′-di-t-butyl-2,2′-thiodi-p-cresol, 1,3,5-tris(4-t-butyl-3-hydroxy-2,6-xylyl)methyl-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione and dioctadecyl 3,3′-thiodipropionate.

5. The crosslinked polyethylene composition according to claim 1 , further comprising 0.1 to 5 parts by weight of a crosslinking accelerator.

6. The crosslinked polyethylene composition according to claim 5 , wherein the crosslinking accelerator is 2,4-diphenyl-4-methyl-1-pentene, or 1,4-hydroquinone.

7. The crosslinked polyethylene composition according to claim 1 , further comprising 0.1 to 5 parts by weight of a treeing inhibitor.

8. The crosslinked polyethylene composition according to claim 7 , wherein the treeing inhibitor is polyethylene glycol.

9. The crosslinked polyethylene composition according to claim 1 , wherein the methanol extraction content of the crosslinked polyethylene is 900 ppm or less.

10. A cable comprising the crosslinked polyethylene composition according to claim 1 .

11. The cable according to claim 10 , wherein the extruded outer diameter deviation of a cable prepared from the crosslinked polyethylene is ±0.5 mm or less.

Assignees

• Lg Chemical Ltd

Inventors

• Sun Ka Ram
• Park In Gyu
• Nam Youn Sun
• Song Young Il

Classifications

• C08K5/14 Primary

  Peroxides · CPC title

• C08L2203/202

  use in electrical wires or wirecoating · CPC title

• C08K5/06

  Ethers; Acetals; Ketals; Ortho-esters · CPC title

• C08F10/02

  Ethene · CPC title

• C08K5/08

  Quinones · CPC title