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1. (WO2018140627) PEROXIDE-MODIFIED POLYETHYLENE, COMPOSITIONS, AND APPLICATIONS
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CLAIMS

What is claimed is:

1. A process for preparing a peroxide-modified polyethylene comprising the steps of:

(A) preparing a first Ziegler-Natta-catalyzed polyethylene in a first reactor;

(B) transferring the first Ziegler-Natta-catalyzed polyethylene from the first reactor to a second reactor;

(C) admixing a first amount of an organic peroxide to the second reactor;

(D) reacting the organic peroxide with a polyethylene composition made from or containing the first Ziegler-Natta-catalyzed polyethylene, thereby coupling the polyethylene components and forming the peroxide-modified polyethylene; and

(£) collecting the peroxide-modified polyethylene.

2. The process for preparing a peroxide-modified polyethylene of Claim 1, wherein the first Ziegler-Natta-catalyzed polyethylene is a linear low density polyethylene, having a melt index (ASTM D 1238) in the range of about 5.5 g/10 min to about 7.5 g/10 min, a density (ASTM D 1505) in the range of about 0.88 g/cc to about 0.925 g/cc, a tensile strength (ASTM D 638) in the range of about 1400 psi to about 2,000 psi, and an elongation at break (ASTM D 638) in the range of about 750% to about 1000%.

3. The process for preparing a peroxide-modified polyethylene of Claim 1, wherein the organic peroxide is added in a first amount less than about 2000 ppm.

4. The process for preparing a peroxide-modified polyethylene of Claim 1, further comprising the steps of:

(A2) preparing a high density polyethylene in a third reactor; and

(B2) transferring the high density polyethylene from the third reactor to the second reactor,

wherein the polyethylene composition further comprises the high density polyethylene.

5. The process for preparing a peroxide-modified polyethylene of Claim 4, wherein the high density polyethylene has amelt index (ASTM D 1238) in the range of about 0.1 g/10 min to about 1.5 g/10 min, a density (ASTM D 1505) in the range of about 0.94 g/cc to about 0.97 g/cc, an ESCR, 100 % Igepal (ASTM D 1693) of 0 failures in 7 days, a tensile strength (ASTM D 638) in the range of about 2,500 psi to about 3,500 psi, and an elongation at break (ASTM D 638) in the range of about 600% to about 1000%.

6. The process for preparing a peroxide-modified polyethylene of Claim 4, wherein the polyethylene composition comprises:

(i) about 60 weight percent to about 95 weight percent, based upon the total weight of the polyethylene composition, of the first Ziegler-Natta-catalyzed polyethylene and

(ii) about 5 weight percent to about 40 weight percent, based upon the total weight of the polyethylene composition, of the high density polyethylene.

7. The process for preparing a peroxide-modified polyethylene of Claim 1 , further comprising the steps of:

(A2) preparing a second Ziegler-Natta-catalyzed polyethylene in a third reactor; and (B2) transferring the second Ziegler-Natta-catalyzed polyethylene from the third reactor to the second reactor,

wherein

(i) the first Ziegler-Natta-catalyzed polyethylene has a melt index (ASTM D 1238) in the range of about 5.5 g/lOmin to about 7.5 g/10 min;

(ii) the second Ziegler-Natta-catalyzed polyethylene has a melt index in the range of about 0.5 g/10 min to about 3.0 g/10 min; and

(iii) the polyethylene composition further comprises the second Ziegler-Natta-catalyzed polyethylene.

8. The process for preparing a peroxide-modified polyethylene of Claim 7, wherein

(I) the first Ziegler-Natta-catalyzed polyethylene is a linear low density polyethylene, having a density (ASTM D 1505) in the range of about 0.88 g/cc to about 0.925 g/cc, a tensile strength (ASTM D 638) in the range of about 1400 psi to about 2,000 psi, and an elongation at break (ASTM D 638) in the range of about 750% to about 1000% and 01) the second Ziegler-Natta-catalyzed polyethylene is a linear low density polyethylene, having a melt index (ASTM D 1238) in the range of about 1.5 g/10 min to about 2.5 g/10 min and a density (ASTM D 1505) in the range of about 0.88 g/cc to about 0.925 g/cc.

9. The process for preparing a peroxide-modified polyethylene of Claim 7, wherein the polyethylene composition comprises:

(i) about 5 weight percent to about 30 weight percent, based upon the total weight of the polyethylene composition, of the first Ziegler-Natta-catalyzed polyethylene and

(ii) about 70 weight percent to about 95 weight percent, based upon the total weight of the polyethylene composition, of the second Ziegler-Natta-catalyzed polyethylene.

10. A process for preparing a moisture-curable, silane-grafted wire-and-cable composition comprising the steps of:

(A) preparing a first Ziegler-Natta-catalyzed polyethylene in a first reactor;

(B) transferring the first Ziegler-Natta-catalyzed polyethylene from the first reactor to a second reactor;

(C) admixing a first amount of an organic peroxide to the second reactor;

(D) reacting the organic peroxide with a polyethylene composition made from or containing the first Ziegler-Natta-catalyzed polyethylene, thereby coupling the polyethylene components and forming the peroxide-modified polyethylene; and

(E) grafting silane onto the peroxide-modified polyethylene, thereby forming a moisture-curable, silane-grafted wire-and-cable composition.

11. The process for preparing a moisture-curable, silane-grafted wire-and-cable composition of Claim 10, further comprising the steps of:

(A2) preparing a high density polyethylene in a third reactor; and

(B2) transferring the high density polyethylene from the third reactor to the second reactor,

wherein the polyethylene composition further comprises the high density polyethylene.

12. The process for preparing a moisture-curable, silane-grafted wire-and-cable composition of Claim 10, further comprising the steps of:

(A2) preparing a second Ziegler-Natta-catalyzed polyethylene in a third reactor; and (B2) transferring the second Ziegler-Natta-catalyzed polyethylene from the third reactor to the second reactor,

wherein

(i) the first Ziegler-Natta-catalyzed polyethylene has a melt index (ASTM D 1238) in the range of about 5.5 g/lOmin to about 7.5 g/10 min;

(ii) the second Ziegler-Natta-catalyzed polyethylene has a melt index in the range of about 0.5 g/10 min to about 3.0 g/10 min; and

(iii) the polyethylene composition further comprises the second Ziegler-Natta-catalyzed polyethylene.

A peroxide-modified polyethylene composition comprising:

(1) a peroxide-modified polyethylene comprising

(A) the reaction products of

(i) a polyethylene composition comprising a first Ziegler-Natta- catalyzed polyethylene and

(ii) a first amount of an organic peroxide to the second reactor.

14. The peroxide-modified polyethylene composition of Claim 13, wherein the polyethylene composition further comprises (i2) a high density polyethylene.

15. The peroxide-modified polyethylene composition of Claim 13, wherein

(i2) the polyethylene composition further comprises a second Ziegler- Natta-catalyzed polyethylene;

(iii) the first Ziegler-Natta-catalyzed polyethylene has a melt index (ASTM D 1238) in the range of about 5.5 g/10 min to about 7.5 g/10 min; and

(iv) the second Ziegler-Natta-catalyzed polyethylene has a melt index in the range of about 0.5 g/10 min to about 3.0 g/10 min.