Moisture curable composition for wire and cable insulation and jacket layers

1. A jacket layer for a coated conductor, the jacket layer comprising:

(A) from 20 wt % to 80 wt % of a crosslinked silane-functionalized polyolefin, wherein silane-functionalized polyolefin is a silane-grafted polyethylene;

(B) from 20 wt % to 80 wt % of a filler;

(C) from 1 wt % to 20 wt % of a reactive branched polysiloxane having the structure

wherein x is 0 or 1, each R is independently an alkyl group or aryl group, each R′ is independently an alkyl group, an aryl group, an alkoxy group, or an aryloxy group, A is the molar ratio of crosslinked units and is greater than 0, B is the molar ratio of linear units and is greater than 0, A+B is equal to 1.00, and “ ” is a bond to a Si in another polysiloxane chain; and

(D) from 0.00 wt % to 20 wt % of a silanol condensation catalyst, based on the total weight of the jacket layer.

2. The jacket layer of claim 1 , wherein the reactive branched polysiloxane has a ratio of phenyl branches to methyl branches from 0.1:1 to 1:1.

3. The jacket layer of claim 1 , wherein the reactive branched polysiloxane comprises a functional group selected from the group consisting of a silanol group and an alkoxysilane group.

4. The jacket layer of claim 1 having a crush resistance of 5000 Newtons to 8500 Newtons.

5. The jacket layer of claim 4 having a hot deformation from 0% to 35%.

6. The jacket layer of claim 1 wherein the jacket layer further comprises at least one of a metal deactivator, a moisture scavenger, and an antioxidant.

7. The jacket layer of claim 1 , wherein the jacket layer is an insulation layer.

8. A coated conductor comprising:

a conductor; and

a coating on the conductor, the coating comprising

(A) from 20 wt % to 80 wt % of a crosslinked silane-functionalized polyolefin, wherein the crosslinked silane-functionalized polyolefin is a crosslinked silane-grafted polyethylene;

(B) from 20 wt % to 80 wt % of a filler;

(C) from 1 wt % to 20 wt % of a reactive branched polysiloxane having the structure

wherein x is 0 or 1, each R is independently an alkyl group or aryl group, each R′ is independently an alkyl group, an aryl group, an alkoxy group, or an aryloxy group, A is the molar ratio of crosslinked units and is greater than 0, B is the molar ratio of linear units and is greater than 0, A+B is equal to 1.00, and “ ” is a bond to a Si in another polysiloxane chain; and

(D) from 0.00 wt % to 20 wt % of a silanol condensation catalyst, based on the total weight of the coating.

9. The coated conductor of claim 8 , wherein the reactive branched polysiloxane has a ratio of phenyl branches to methyl branches from 0.1:1 to 1:1.

10. The coated conductor of claim 8 , wherein the coating further comprises at least one of a metal deactivator, a moisture scavenger, and an antioxidant.

11. The coated conductor of claim 8 having a crush resistance of 5000 Newtons to 8500 Newtons.

12. The coated conductor of claim 11 having a hot deformation from 0% to 35%.

13. A crosslinkable composition comprising:

(A) from 20 wt % to 80 wt % of a crosslinked silane-grafted polyethylene;

(B) from 20 wt % to 80 wt % of a filler;

(C) from 1 wt % to 20 wt % of a reactive branched polysiloxane having the structure

wherein x is 0 or 1, each R is independently an alkyl group or aryl group, each R′ is independently an alkyl group, an aryl group, an alkoxy group, or an aryloxy group, A is the molar ratio of crosslinked units and is greater than 0, B is the molar ratio of linear units and is greater than 0, A+B is equal to 1.00, and “ ” is a bond to a Si in another polysiloxane chain; and

(D) from 0.00 wt % to 20 wt % of a silanol condensation catalyst, based on the total weight of the composition.

14. The crosslinkable composition of claim 13 , comprising the silanol condensation catalyst.

15. The crosslinkable composition of claim 14 , comprising

(E) from 0.01 wt % to 10 wt % of a metal deactivator;

(F) from 0.01 wt % to 3.0 wt % of a moisture scavenger;

(G) from 0.01 wt % to 2 wt % of an antioxidant.