Insulation composition

Patent metadata

Field	Value
Publication number	US-11795257-B2
Application number	US-201816638903-A
Country	US
Kind code	B2
Filing date	Aug 14, 2018
Priority date	Aug 18, 2017
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

The present invention relates to a precursor material for an insulation composition, comprising: a crosslinkable graft polymer comprising a polyolefin component and a polyene component; and an antioxidant. The present invention also relates to an insulation composition obtained from the precursor material.

First claim

The invention claimed is:

1. A precursor material for an insulation composition, comprising:
a crosslinkable graft polymer comprising a polyolefin component that forms a backbone and a polyene component that forms one or more side chains grafted onto the backbone,
wherein the polyene component is derived from a polyene comprising farnesene; squalene; 1,2,4-trivinylcyclohexane; cyclooctatriene; trans,trans,cis-1,5,9-cyclododecatriene; triallyl isocyanurate (1,3,5-triallyl-1,3,5-triazinane-2,4,6-trione); triallyl cyanurate (2,4,6-triallyloxy-1,3,5-triazine); or a mixture thereof; and
an antioxidant.

2. The precursor material according to claim 1 , wherein the polyolefin component is derived from a polyolefin comprising polyethylene and/or polypropylene.

3. The precursor material according to claim 1 , wherein the polyene component is derived from
1,2,4-trivinylcyclohexane.

4. The precursor material according to claim 1 , wherein the antioxidant:
a. comprises one or more components selected from the group consisting of: phenolic antioxidants, phosphite antioxidants, sulphur-containing antioxidants, aminic antioxidants, and mixtures thereof;
b. comprises a single antioxidant; or
c. comprises a blend of two or more antioxidants.

5. The precursor material according to claim 4 , wherein the single antioxidant has both phenolic functionality and sulphur functionality.

6. The precursor material according to claim 4 , wherein the single antioxidant is 4,4′-thiobis (2-t-butyl-5-methylphenol) or 4,6-bis(octylthiomethyl)-o-cresol.

7. The precursor material according to claim 4 , wherein the blend of two or more antioxidants comprises:
i. at least one fully hindered phenolic antioxidant; at least one partially hindered phenolic antioxidant; and at least one sulphur-containing antioxidant; or
ii. at least one low hindered phenolic antioxidant and/or at least one non-hindered phenolic antioxidant.

8. The precursor material according to claim 1 , further comprising a crosslinking agent.

9. The precursor material according to claim 8 , wherein the crosslinking agent is a peroxide.

10. The precursor material according to claim 9 , wherein the peroxide is selected from the group consisting of dicumylperoxide; 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane; tert-butylcumylperoxide; di-tert-amylperoxide; 2,5-di(tert-butylperoxy)-2,5-dimethyl-3-hexyne; di(tert-butyl)peroxide; di(tert-butylperoxy-isopropyl)benzene; butyl-4,4-bis(tert-butylperoxy)valerate; 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane; tert-butylperoxybenzoate; dibenzoyl peroxide; and combinations thereof.

11. The precursor material according to claim 1 , further comprising a scorch retarder.

12. The precursor material according to claim 11 , wherein the scorch retarder is 2,4-diphenyl-4-methyl-1-pentene.

13. The precursor material according to claim 1 , wherein the polyene component is derived from a triene.

14. The precursor material according to claim 1 , wherein the polyene component is derived from 1,2,4-trivinylcyclohexane and is present in an amount of from 0.1% to 2% by weight of the polyolefin component, wherein the antioxidant is present in an amount of 0.1% to 0.5% by weight of the polyolefin component, and wherein the precursor material further comprises a scorch retarder in an amount of 0.1% to 1% by weight of the polyolefin component.

15. An insulation composition comprising a crosslinked precursor material according to claim 1 .

16. A wire or cable comprising an electrically conductive material surrounded by the insulation composition according to claim 15 .

17. A process for forming an insulation composition, comprising:
combining a polyolefin, a polyene comprising farnesene; squalene; 1,2,4-trivinylcyclohexane; cyclooctatriene; trans,trans,cis-1,5,9-cyclododecatriene; triallyl isocyanurate (1,3,5-triallyl-1,3,5-triazinane-2,4,6-trione); triallyl cyanurate (2,4,6-triallyloxy-1,3,5-triazine); or a mixture thereof, a crosslinking agent, and an antioxidant to form a reaction mixture; and
heating the reaction mixture to form an insulation composition according to claim 15 .

18. A process for forming a precursor material, comprising:
combining a polyolefin, a polyene comprising farnesene; squalene; 1,2,4-trivinylcyclohexane; cyclooctatriene; trans,trans,cis-1,5,9-cyclododecatriene; triallyl isocyanurate (1,3,5-triallyl-1,3,5-triazinane-2,4,6-trione); triallyl cyanurate (2,4,6-triallyloxy-1,3,5-triazine); or a mixture thereof, and an antioxidant to form a reaction mixture; and
heating the reaction mixture to form a precursor material according to claim 1 .

19. A precursor material for an insulation composition, comprising:
a crosslinkable graft polymer comprising a polyolefin component that forms a backbone and a polyene component that forms one or more side chains grafted onto the backbone, wherein the polyene component is derived from 1,2,4-trivinylcyclohexane;
an antioxidant; and
a scorch retarder.

20. The precursor material according to claim 19 , wherein the scorch retarder comprises 2,4-diphenyl-4-methyl-1-pentene.

Assignees

• Si Group Usa Usaa Llc
• Si Group Inc

Inventors

• Labbe Denis Louis Emile
• Rider Christopher John
• Ebenezer Warren J
• Hill Jonathan

Classifications

• C08F255/02 Primary

  on to polymers of olefins having two or three carbon atoms · CPC title

• C08K5/01

  Hydrocarbons {(C08K5/0091 takes precedence)} · CPC title

• C08K5/14

  Peroxides · CPC title

• C08K5/375

  containing six-membered aromatic rings {(C08K5/3725 takes precedence)} · CPC title

• C08L23/083

  with aliphatic polyenes, i.e. containing two or more carbon-to-carbon double bonds · CPC title