Low voltage power cable with insulation layer comprising polyolefin having polar groups, hydrolysable silane groups, and including a silanol condensation catalyst
A low voltage power cable having an insulation layer with a density below 1100 kg/m 3 , which has a polyolefin having 0.002-4% mol of a compound that has polar groups and further having a compound that has hydrolysable silane groups and includes 0.0001-3% weight of a silanol condensation catalyst and a process of manufacturing such a cable.
1. A low voltage power cable comprising an insulation layer with a density below 1100 kg/m 3 which comprises a polyolefin having incorporated 0.02 to 4 mol % of a compound having polar groups, and further having incorporated a compound having hydrolysable silane groups, and which further comprises 0.0001 to 3 wt.-% of a silanol condensation catalyst.
2. A low voltage power cable according to claim 1 , wherein the polar groups are selected from siloxane, amide, anhydride, carboxylic, carbonyl, hydroxyl, ester and epoxy groups.
3. A low voltage power cable according to claim 2 , wherein the compound having polar groups is butyl acrylate.
4. A low voltage power cable according to claim 3 wherein the thickness of the insulation layer is 0.4 to 3 mm.
5. A low voltage power cable according to claim 2 wherein the thickness of the insulation layer is 0.4 to 3 mm.
6. A low voltage power cable according to claim 1 , wherein the polyolefin comprises 0.1 to 2.0 mol % of the compound having polar groups.
7. A low voltage power cable according to claim 6 wherein the thickness of the insulation layer is 0.4 to 3 mm.
8. A low voltage power cable according to claim 1 , wherein the polyolefin comprises 0.001 to 15 wt. % of the compound having silane groups.
9. A low voltage power cable according to claim 8 , wherein the polymer composition further comprises a sulphonic acid or an organic tin compound as a silanol condensation catalyst.
10. A low voltage power cable according to claim 8 wherein the thickness of the insulation layer is 0.4 to 3 mm.
11. A low voltage power cable according to claim 1 , wherein the polymer composition further comprises a sulphonic acid or an organic tin compound as a silanol condensation catalyst.
12. A low voltage power cable according to claim 11 wherein the thickness of the insulation layer is 0.4 to 3 mm.
13. A low voltage power cable according to claim 1 , wherein the thickness of the insulation layer is 0.4 to 3 mm.
14. A process for producing a low voltage power cable comprising a conductor and an insulation layer, which layer comprises a polyolefin having incorporated 0.02 to 4 mol % of a compound having polar groups, and further having incorporated a compound having hydrolysable silane groups, and which further comprises 0.0001 to 3 wt % of a silanol condensation catalyst, which process comprising extrusion of an insulation layer on a conductor which is preheated to a maximum temperature of 65° C.
15. A process according to claim 14 wherein the extrusion of the insulation layer is performed on the non-preheated conductor.
16. The production of an insulation layer for a low voltage power cable comprising forming said insulation layer from a polyolefin comprising 0.02 to 4 mol % of a compound having polar groups and further having incorporated a compound having hydrolysable silane groups, and which further comprises 0.0001 to 3 wt % of a silanol condensation catalyst.