Cable having a coating layer made of a recycled polymer material

Patent metadata

Field	Value
Publication number	US-11756701-B2
Application number	US-202217684482-A
Country	US
Kind code	B2
Filing date	Mar 2, 2022
Priority date	Mar 9, 2021
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A cable contains a core including a transmissive element and a coating layer made of a coating material. The coating material contains, with respect to the total weight of polymeric materials present in the composition, (i) 70% to 95% by weight of a recycled linear low density polyethylene (r-LLDPE); and (ii) 5 to 30% by weight of an ethylene-vinyl acetate copolymer (EVA). The EVA may be added to the r-LLDPE or, alternatively, be already contained in the r-LLDPE as a result of previous LLDPE use. The cable may further contain a skin layer placed around and in direct contact with the coating layer based on r-LLDPE.

First claim

The invention claimed is:

1. A cable comprising: a core comprising a transmissive element, and a coating layer made of a coating material, said coating material comprising:
(i) a recycled linear low density polyethylene in an amount of from 70% to 95% by weight; and
(ii) a recycled ethylene-vinyl acetate copolymer in an amount of from 5 to 30% by weight;
the weight percentages being expressed with respect to a total weight of polymeric materials present in the coating material.

2. The cable according to claim 1 , wherein the coating material comprises the recycled linear low density polyethylene in an amount of from 80% to 90% by weight with respect to the total weight of polymeric materials present in the coating material.

3. The cable according to claim 1 , wherein the coating material comprises the recycled ethylene-vinyl acetate copolymer in an amount of 10% to 20% by weight with respect to the total weight of polymeric materials present in the coating material.

4. The cable according to claim 1 , wherein the coating material further comprises a virgin polyethylene homopolymer or copolymer in an amount of 5 to 50% by weight with respect to the total weight of polymeric materials present in the coating material.

5. The cable according to claim 4 , wherein the virgin polyethylene homopolymer or copolymer is selected from linear low density polyethylene and high density polyethylene.

6. The cable according to claim 1 , wherein the coating material further comprises an additional recycled polyethylene homopolymer or copolymer in an amount of 5 to 50% by weight with respect to the total weight of polymeric materials present in the coating material.

7. The cable according to claim 6 , wherein the additional recycled polyethylene homopolymer or copolymer is recycled high density polyethylene.

8. The cable according to claim 1 , wherein the coating material further comprises a detackifier in an amount of from 1 to 25% by weight with respect to the total weight of polymeric materials present in the coating material.

9. The cable according to claim 8 , wherein the detackifier is in an amount of from 1 to 8% by weight with respect to the total weight of polymeric materials present in the coating material.

10. The cable according to claim 8 , wherein the detackifier is at least one of talc, kaolin, calcium carbonate, chalk, stearic acid and a stearate.

11. The cable according to claim 1 , wherein the coating material further comprises carbon black.

12. The cable according to claim 11 , wherein the carbon black is in an amount of from 0.5% to 10% by weight with respect to the total weight of polymeric materials present in the coating material.

13. The cable according to claim 1 , further comprising a skin layer around and in direct contact with the coating layer.

14. The cable according to claim 13 , wherein the skin layer is made of a virgin polyethylene.

15. The cable according to claim 13 , wherein the skin layer has a thickness of from 1 to 20% of the thickness of the coating layer.

Assignees

• Prysmian Spa

Inventors

• Jonsson Gustaf
• Berglund Kristoffer

Classifications

• H01B3/421 Primary

  Polyesters · CPC title

• H01B3/441 Primary

  from alkenes · CPC title

• H01B7/186

  Sheaths comprising longitudinal lapped non-metallic layers · CPC title

• H01B3/448

  from other vinyl compounds · CPC title

• C08L23/0853

  Ethylene vinyl acetate copolymers · CPC title