Polyethylene crosslinkable composition

• US 20020169238A1
• Filed: 03/01/2001
• Published: 11/14/2002
• Est. Priority Date: 03/01/2001
• Status: Active Grant

• Current Assignee: Union Carbide Corporation (Dow, Inc.)
• Original Assignee: Union Carbide Chemicals & Plastics Technology Corporation (Dow, Inc.)
• Inventors: Caronia, Paul Joseph, Cogen, Jeffrey Morris
• Granted Patent: US 6,656,986 B2
• Time in Patent Office: Days
• US Class Current: 524/100
• CPC Class Codes: C08K 5/14 Peroxides
• CPC Class Codes: C08K 5/34924 containing cyanurate groups; Tautomers thereof
• CPC Class Codes: C08K 5/372 Sulfides , e.g. R-(S)x-R'
• CPC Class Codes: C08L 2201/02 Flame or fire retardant/resistant
• CPC Class Codes: C08L 23/02 not modified by chemical after-treatment
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: H01B 13/148 Selection of the insulating material therefor
• CPC Class Codes: H01B 3/441 from alkenes

Abstract

A composition comprising:

(a) polyethylene;

(b) as a scorch inhibitor, [1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione];

(c) a thioester;

(d) a hindered amine stabilizer; and

(e) an organic peroxide.

Claims

1. A composition comprising:

(a) polyethylene;

(b) as a scorch inhibitor, [1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione];

(c) a thioester;

(d) a hindered amine stabilizer; and

(e) an organic peroxide.

2. The composition defined in claim 1 wherein the scorch inhibitor is present in an amount of about 0.01 to about 1 part by weight based on 100 parts by weight of polyethylene.

3. The composition defined in claim 1 wherein the thioester is distearylthiodipropionate.

4. The composition defined in claim 1 wherein the hindered amine stabilizer is selected from the group consisting of (i) 1,6-hexanediamine, N,N′

-bis(2,2,6,6,-tetramethyl-4-piperidinyl)-polymer with 2,4,6 trichloro-1,3,5triazine, reaction products with N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine;

(ii) poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]]); and

(iii) 1,6-hexaneidamine, N,N′

-Bis(2,2,6,6-tetramethyl)-4-piperidinyl)-, polymers with 2,4-dichloro-6-(4-morpholinyl)-1,3,5-triazine.

5. The composition defined in claim 1 wherein the organic peroxide is present in an amount of about 0.4 to about 3 parts by weight based on 100 parts by weight of polyethylene.

6. The composition defined in claim 1 wherein, for each 100 parts by weight of polyethylene, the other components (b), (c), (d) and (e) are present as follows:

(b) about 0.05 to about 0.3 part by weight;

(c) about 0.10 to 0.3 part by weight;

(d) about 0.004 to 0.025 part by weight; and

(e) about 0.6 to about 2.0 parts by weight.

8. The cable defined in claim 5 wherein, for each 100 parts by weight of polyethylene, there are about 0.01 to 1 part by weight of component (b).

9. The cable defined in claim 5 wherein the thioester is distearylthiodipropionate.

10. The cable defined in claim 5 wherein the hindered amine stabilizer is selected from the group consisting of (i) 1,6-hexanediamine, N,N′

-bis(2,2,6,6,-tetramethyl-4-piperidinyl)-polymer with 2,4,6 trichloro-1,3,5triazine, reaction products with N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine;

(ii) poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]]); and

(iii) 1,6-hexaneidamine, N,N′

-Bis(2,2,6,6-tetramethyl)-4-piperidinyl)-, polymers with 2,4-dichloro-6-(4-morpholinyl)-1,3,5-triazine.

7. A cable comprising one or more electrical conductors or a core of electrical conductors, each conductor or core being surrounded by a composition comprising:

(a) a crosslinked polyethylene;

(b) as a scorch inhibitor,[1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione];

(c) a thioester; and

(d) a hindered amine stabilizer.

11. A process for extrusion comprising extruding around one or more electrical conductors or a core of electrical conductors, at a temperature below the decomposition temperature of the organic peroxide, a composition comprising

(a) polyethylene;

(b) as a scorch inhibitor, [1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione];

(c) a thioester;

(d) a hindered amine; and

(e) an organic peroxide, and curing the extrudate.