Cable insulation compositions comprising a sulfur-containing second antioxidant

Patent metadata

Field	Value
Publication number	US-2018215900-A1
Application number	US-201615579478-A
Country	US
Kind code	A1
Filing date	May 25, 2016
Priority date	Jun 17, 2015
Publication date	Aug 2, 2018
Grant date	—

Abstract

The process for making extra high voltage cable insulation is improved by using a composition comprising in weight percent based on the weight of the composition: (A) 95 to 99.9% of an ethylene-based polymer; (B) 0.2 to 2.5% peroxide; (C) 0.01 to 0.5% of a sulfur-containing first antioxidant having at least one —S(CH 2 ) 2 C0 2 R group, wherein R is C6 to C20 alkyl; (D) 0.001 to 0.009%) of a sulfur-containing second antioxidant that does not contain a —S(CH 2 ) 2 C0 2 R group, wherein R is a C6 to C20 alkyl; (E) Optionally, an organic nitrogenous base; and (F) Optionally, a phenolic third antioxidant that does not contain a —S(CH 2 ) 2 C0 2 R group, wherein R is a C6 to C20 alkyl.

First claim

What is claimed is:

1 . A composition comprising in weight percent based on the weight of the composition:
(A) 95 to 99.9% of an ethylene-based polymer; (B) 0.2 to 2.5% peroxide; (C) 0.01 to 0.5% of a sulfur-containing first antioxidant having at least one —S(CH 2 ) 2 CO 2 R group, wherein R is C6 to C20 alkyl; (D) 0.001 to 0.009% of a sulfur-containing second antioxidant that does not contain a —S(CH 2 ) 2 CO 2 R group, wherein R is a C6 to C20 alkyl; (E) Optionally, an organic nitrogenous base; and (F) Optionally, a phenolic third antioxidant that does not contain a —S(CH 2 ) 2 CO 2 R group, wherein R is a C6 to C20 alkyl.

2 . The composition of claim 1 in which the ethylene-based polymer has (i) a melt index (I 2 ) from 0.1 to 100 g/10 min measured according to ASTM D1238, Condition 190° C./2.16 kg and, (ii) a density from 0.910 to 0.940 g/cc measured by the procedure of ASTM D792, Method B.

3 . The composition of claim 2 in which the ethylene-based polymer is a low density polyethylene made in a tubular reactor.

4 . The composition of claim 1 in which the sulfur-containing first antioxidant is at least one of dimyristyl thiodipropionate, distearyl thiodipropionate, dilauryl thiodipropionate, and pentaerythritol tetrakis (B-laurylthiopropionate).

5 . The composition of claim 1 in which the sulfur-containing second antioxidant is at least one of 4,4′-thiobis (2-t-butyl-5-methylphenol); thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; 2,2′-thiobis(6-t-butyl-4-methylphenol); (6,6′-Di-tert-butyl-2,2′-thiodi-p-cresol); and (4,6-bis (octylthiomethyl)-o-cresol).

6 . The composition of claim 8 in which the sulfur-containing second antioxidant does not contain phosphorus.

7 . The composition of claim 1 containing an organic nitrogenous base in an amount of 0.001-0.009 wt % based on the weight of the composition.

8 . The composition of claim 1 containing a phenolic third antioxidant in an amount from 0.05 to 0.5 wt % based on the weight of the composition.

9 . The composition of claim 1 free of polyalkylene glycol.

10 . A cable comprising an insulation sheath made from the composition of claim 1 .

Assignees

• Dow Global Technologies Llc

Inventors

• Cogen Jeffrey M
• Talreja Manish
• Person Timothy J
• Roy Raghunath
• Peterson Thomas H
• Drazba Jessica D
• Dunchus Neil W
• Groot-Enzerink Gerrit

Classifications

• C08K5/14

  Peroxides · CPC title

• C08K5/16

  Nitrogen-containing compounds {(C08K5/0091 takes precedence)} · CPC title

• C08K5/00

  Use of organic ingredients · CPC title

• C08L23/06 Primary

  Polyethylene · CPC title

• H01B7/295

  using material resistant to flame · CPC title