Moisture curable composition for wire and cable insulation and jacket layers
An insulation or jacket layer for a coated conductor is composed of (A) a crosslinked silane-functional polyolefin, (B) a filler composed of greater than 50 wt % silica, based on the total weight of the filler, (C) a silicone-containing polymer selected from the group consisting of reactive linear silicone-containing polymers, non-reactive linear silicone-containing polymers, and non-reactive branched silicone-containing polymers, and (D) from 0.00 wt % to 20 wt % of a silanol condensation catalyst, based on the total weight of the insulation or jacket layer.
1. A crosslinkable composition comprising:
(A) a silane-functionalized polyolefin;
(B) a filler comprising greater than 50 wt % silica, based on the total weight of the filler, the silica having a median particle size (D50) from 0.01 um to 50 um;
(C) a silicone-containing polymer selected from the group consisting of non-reactive linear silicone-containing polymers and non-reactive branched silicone-containing polymer; and
(D) from 0.00 wt % to 20 wt % of a silanol condensation catalyst, based on the total weight of the crosslinkable composition.
2. A jacket layer for a coated conductor, the jacket layer comprising:
(A) a crosslinked silane-functionalized polyolefin;
(B) a filler comprising greater than 50 wt % silica, based on the total weight of the filler, the silica having a median particle size (D50) from 0.01 um to 50 um;
(C) a silicone-containing polymer selected from the group consisting of non-reactive linear silicone-containing polymers and non-reactive branched silicone-containing polymers; and
(D) from 0.00 wt % to 10 wt % of a silanol condensation catalyst, based on the total weight of the jacket layer.
3. The jacket layer of claim 2 , wherein the crosslinked silane-functionalized polyolefin is a silane-grafted ethylene-based polymer.
4. The jacket layer of claim 3 , wherein the filler comprises greater than 90 wt % to 100 wt % silica, based on the total weight of the filler.
5. The jacket layer of claim 4 , wherein the filler consists solely of silica.
6. The jacket layer of claim 2 , wherein the silicone-containing polymer is a non-reactive linear polysiloxane.
7. The jacket layer of claim 2 , comprising, based on total weight of the jacket layer,
(A) from 20 wt % to 80 wt % of the crosslinked silane-functionalized polyolefin, wherein the crosslinked silane-grafted polyolefin is a crosslinked silane-grafted polyethylene;
(B) from 20 wt % to 80 wt % of the filler; and
(C) from 4 wt % to 20 wt % of the silicone-containing polymer.
8. The jacket layer of claim 2 , wherein the filler comprises from 0 wt % to 0.5 wt % metals, based on the total weight of the filler.
9. The jacket layer of claim 8 , wherein the jacket layer comprises from 0 wt % to 0.3 wt % metals, based on the total weight of the filler.
10. The jacket layer of claim 2 comprising from greater than 2 wt % to 20 wt % of the silicone-containing polymer, based on the total weight of the jacket layer, the jacket layer having a wet insulation resistance ratio from 1.10 to 1.70.
11. The jacket layer of claim 10 , wherein the jacket layer comprises from 4 wt % to 20 wt % of the silicone-containing polymer, based on the total weight of the jacket layer, and the jacket layer passes the horizontal burn test.
12. The jacket layer of claim 2 , wherein the jacket layer further comprises at least one of a metal deactivator, a moisture scavenger, and an antioxidant.
13. The jacket layer of claim 2 , wherein the jacket layer is an insulation layer.
14. A coated conductor comprising:
a conductor; and
a coating on the conductor, the coating comprising
(A) a crosslinked silane-functionalized polyolefin;
(B) a filler comprising greater than 50 wt % silica, based on the total weight of the filler, the silica having a median particle size (D50) from 0.01 um to 50 um;
(C) a silicone-containing polymer selected from the group consisting of non-reactive linear silicone-containing polymers or non-reactive branched silicone-containing polymers; and
(D) from 0.00 wt % to 20 wt % of a silanol condensation catalyst, based on the total weight of the coating.
15. The coated conductor of claim 14 , wherein the coating comprises from 0 wt % to 0.3 wt % metals, based on the total weight of the filler.
16. The coated conductor of claim 15 , wherein the coating comprises from greater than 2 wt % to 20 wt % of the silicone-containing polymer, based on the total weight of the coating layer; and the coated conductor has a wet insulation resistance ratio of 1.10 to 1.70.
17. The coated conductor of claim 16 , wherein the coating comprises from 4 wt % to 20 wt % of the silicone-containing polymer, based on the total weight of the coating, and the coated conductor passes the horizontal burn test.