Cable insulation compositions comprising a sulfur-containing second antioxidant

Patent metadata

Field	Value
Publication number	US-10221298-B2
Application number	US-201615579478-A
Country	US
Kind code	B2
Filing date	May 25, 2016
Priority date	Jun 17, 2015
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

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 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.

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 sulfur-containing first antioxidant is at least one of dimyristyl thiodipropionate, distearyl thiodipropionate, dilauryl thiodipropionate, and pentaerythritol tetrakis (B-laurylthiopropionate).

3. 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).

4. 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.

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

6. 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.

7. The composition of claim 6 in which the ethylene-based polymer is a low density polyethylene made in a tubular reactor.

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 8 in which the sulfur-containing second antioxidant does not contain phosphorus.

10. The composition of claim 1 , wherein the composition is not crosslinked and the composition retains from 0.97 to 1.00 of a maximum torque after aging for 7 days at 70° C.

11. The composition of claim 10 , wherein the composition has a dissipation factor of less than, or equal to, 0.038.

12. The composition of claim 11 , wherein the composition has an unaged maximum torque greater than, or equal to, 2.24 in-lb.

13. 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

• C08L23/06 Primary

  Polyethylene · CPC title

• C08K5/14

  Peroxides · CPC title

• H01B7/295

  using material resistant to flame · CPC title

• C08L23/04

  Homopolymers or copolymers of ethene · CPC title

• C08K5/00

  Use of organic ingredients · CPC title