Low loss foam composition and cable having low loss foam layer

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/06 (2006.01) C08J 9/00 (2006.01) C08J 9/12 (2006.01) C08L 23/12 (2006.01) C08L 23/16 (2006.01)

Patent

CA 2523861

The invention relates to a low loss foam composition and cable, such as a coaxial cable. The foam composition is formed by heating an olefinic polymer, such as a high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, or a combination thereof, into a molten state composition, optionally with a nucleating agent. The molten mixture is extruded under pressure through a die with a blowing agent comprising an atmospheric gas, such as carbon dioxide, nitrogen or air, and a co-blowing agent selected from hydrofluorocarbons, hydrochlorofluorocarbons, or perfluoro compounds, such as HFC-134a. The cable is formed by extruding the foam composition onto a signal carrying conductor and sheathing the foam-coated signal carrying conductor in an appropriate conducting shield.

L'invention concerne une composition de mousse à faible perte et un câble, tel qu'un câble coaxial. La composition de mousse est formée par chauffage d'un polymère oléfinique, tel qu'un polyéthylène haute densité, un polyéthylène densité moyenne, un polyéthylène faible densité, un polyéthylène à faible densité linéaire, un polypropylène ou une association de ces derniers, ce qui permet d'obtenir une composition en état de fusion, contenant éventuellement un agent de nucléation. Ce mélange en fusion est extrudé sous pression à l'aide d'un poinçon et d'un agent gonflant contenant un gaz atmosphérique, tel que du dioxyde de carbone, de l'azote ou de l'air et un agent cogonflant sélectionné parmi les hydrocarbures fluorés, les hydrocarbures partiellement halogénés ou les composés perfluoro, tels qu'un HFC-134a. Le câble est réalisé par extrusion de la composition de mousse sur un conducteur de signaux et par gainage du conducteur de signaux enrobé de mousse dans un écran conducteur approprié.

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