Stress/thermal cracking resistant cable sheath material

Details Stress/thermal cracking resistant cable sheath material Stress/thermal cracking resistant cable sheath material

C - Chemistry, Metallurgy

08

K

C08K 3/22 (2006.01) C08K 3/26 (2006.01) C08L 23/08 (2006.01) C08L 23/10 (2006.01) C08L 23/16 (2006.01) H01B 7/29 (2006.01)

Patent

CA 2679916

A composition useful as a wire or cable insulation or sheathing layer, the composition comprising (i) an inorganic flame retardant, e.g., aluminum trihydroxide (ATH), (ii) ethylene ethyl acetate (EEA) or ethylene butyl acrylate (EBA), (iii) a homogeneous polyethylene, (iv) an ethylenic resin modified with an organo-functional group, e.g., maleic anhydride (MAH) grafted polyethylene, (v) a silicone polymer, and optionally, (vi) a smoke suppressant. The insulation or sheathing layer comprising the composition of this invention exhibits good resistance to stress and/or thermal cracking.

L'invention concerne une composition utile comme couche d'isolation ou de gainage de fil ou de câble. La composition comprend (i) un ignifuge inorganique, par exemple, le trihydroxyde d'aluminium (ATH) ; (ii) l'éthylacétate d'éthylène (EEA) ou le butylacrylate d'éthylène (EBA) ; (iii) un poly(éthylène) homogène ; (iv) une résine éthylénique modifiée par un groupe organofonctionnel, par exemple, un poly(éthylène) greffé par anhydride maléique (MAH) ; (v) un polymère de silicone ; et facultativement, (vi) un éliminateur de fumée. La couche d'isolation ou de gainage comprenant la composition de la présente invention présente une bonne résistance à la contrainte et/ou à la fissuration thermique.

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