Polypropylene-based wire and cable insulation or jacket

H - Electricity – 01 – B

Patent

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Details

H01B 3/44 (2006.01)

Patent

CA 2617902

The invention is an electrically conductive device, e.g., a wire or cable, having a crush resistance of at least about 18 pounds per square inch (psi), the device comprising : A. An electrically conductive member comprising at least one electrically conductive substrate, e.g., a wire strand or a pair of twisted wire strands ; and B. At least one electric-insulating member substantially surrounding the electrically conductive member, e.g., a polymer coating or layer, the electric-insulating member comprising a polymer blend, the polymer blend comprising: 1. At least about 50 weight percent of a polypropylene, and 2. At least about 10 weight percent of an elastomer. In one embodiment, the blend is characterized as having (i) a hot creep of less than 200% at 150C, (ii) a dielectric constant at 60 Hz and 90C of less than about 2.5, (iii) a dissipation factor at 60 Hz and 90C of less than about 0.005, and (iv) an AC breakdown strength of greater than about 600 v/mil.

La présente invention concerne un dispositif électroconducteur, tel un fil ou un câble par exemple, qui présente une résistance à l~écrasement ayant une valeur d~environ 18 livres par pouce carré (psi), le dispositif comprenant : A. un élément d~isolation électrique composé d~au moins un substrat électroconducteur, tel un toron ou une paire de torons torsadés par exemple ; et B. au moins un élément d~isolation électrique entourant sensiblement l~élément électroconducteur, tel un revêtement ou une couche de polymère par exemple, et contenant un mélange de polymère, ledit mélange comprenant : 1. au moins 50 % en poids d~un polypropylène ; et 2. au moins 10 % en poids d~un élastomère. Selon un mode de réalisation, le mélange se caractérise en ce qu~il présente (i) un fluage à chaud inférieur à 200 % à 150 C°, (ii) une constante diélectrique à 60 Hz et 90 C° inférieure à 2,5, (iii) un facteur de dissipation à 60 Hz et 90 C° inférieur à environ 0,005, et (iv) une résistance au claquage AC supérieure à environ 600 v/mil.

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