Flame resistant silicone rubber wire and cable coating...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 83/07 (2006.01) C08J 3/24 (2006.01) C08J 5/04 (2006.01) C08K 3/34 (2006.01) C08K 3/36 (2006.01) C08K 5/14 (2006.01) C09K 21/14 (2006.01) H01B 3/46 (2006.01) H01B 7/295 (2006.01) H01B 11/00 (2006.01)

Patent

CA 2362066

A curable silicone wire and cable coating composition with improved flame resistance at heat flux rates of 50 to 90 kW/m2, made by mixing ingredients comprises: (A) 30 to 90 weigth percent of a heat-curable non-halogenated organosiloxane polymer, containing at least 2 alkenyl groups per molecule, (B) 1 to 65 weigth percent of a reinforcing silica filler, based on the total composition, (C) 5 to 70 weight percent wollastonite having an average particle size of 2 to 30 µm, based on the total composition, and (D) curing component sufficient to cure the composition.

L'invention concerne une composition de revêtement pour fils et câbles à base de silicone durcissable, cette composition présentant une résistance à l'inflammation améliorée à un flux thermique variant entre 50 et 90 kW/m?2¿. Cette composition, fabriquée à partir d'ingrédients mélangés, renferme: A) 30 à 90 pour cent en poids d'un polymère d'organosiloxane non halogéné thermodurcissable, contenant au moins 2 groupes alkényles par molécule, B) entre 1 et 65 pour cent en poids d'une matière de charge renforçante de silice, sur la base de la composition totale, C) 5 à 70 pour cent en poids de wollastonite présentant une taille moyenne des particules située entre 2 et 30 µm, sur la base de la composition totale, et enfin D) un agent de durcissement suffisant pour durcir cette composition.

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